iOS中UITableView中的“展开/折叠”部分

有人可以告诉我以下方法执行UITableView可扩展/可折叠动画sections的UITableView方法吗？

要么

您必须制作自己的自定义标题行，并将其作为每个部分的第一行。子类化UITableView已经存在的或标头会很麻烦。基于它们现在的工作方式，我不确定您是否可以轻松地采取行动。您可以像标题一样将单元格设置为LOOK，然后设置tableView:didSelectRowAtIndexPath为手动展开或折叠其所在的部分。

我将存储一个布尔数组，该数组对应于每个部分的“ expended”值。然后，您可以tableView:didSelectRowAtIndexPath在每个自定义标题行上的切换此值，然后重新加载该特定部分。

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.row == 0) {
        ///it's the first row of any section so it would be your custom section header

        ///put in your code to toggle your boolean value here
        mybooleans[indexPath.section] = !mybooleans[indexPath.section];

        ///reload this section
        [self.tableView reloadSections:[NSIndexSet indexSetWithIndex:indexPath.section] withRowAnimation:UITableViewRowAnimationFade];
    }
}

然后设置numberOfRowsInSection为检查该mybooleans值，如果未扩展该部分，则返回1，如果扩展该部分，则返回1+。

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    if (mybooleans[section]) {
        ///we want the number of people plus the header cell
        return [self numberOfPeopleInGroup:section] + 1;
    } else {
        ///we just want the header cell
        return 1;
    }
}

另外，您将需要更新cellForRowAtIndexPath以返回任何部分第一行的自定义标题单元格。

Apple在此处提供了一些用于使用表视图节标题为扩展/折叠动作设置动画的示例代码：表视图动画和手势

此方法的关键是实现- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section并返回一个自定义UIView，该UIView包含一个按钮（通常与标题视图本身的大小相同）。通过子类化UIView并将其用于标题视图（如本示例所示），您可以轻松地存储其他数据，例如节号。

我有一个很好的解决方案，灵感来自苹果公司的Table View动画和手势。我从Apple的样本中删除了不必要的部分，并将其迅速翻译了下来。

我知道答案很长，但是所有代码都是必需的。幸运的是，您只需复制并粘贴大部分代码，只需对步骤1和3进行一些修改即可。

1.创建SectionHeaderView.swift并SectionHeaderView.xib

import UIKit

protocol SectionHeaderViewDelegate {
    func sectionHeaderView(sectionHeaderView: SectionHeaderView, sectionOpened: Int)
    func sectionHeaderView(sectionHeaderView: SectionHeaderView, sectionClosed: Int)
}

class SectionHeaderView: UITableViewHeaderFooterView {

    var section: Int?
    @IBOutlet weak var titleLabel: UILabel!
    @IBOutlet weak var disclosureButton: UIButton!
    @IBAction func toggleOpen() {
        self.toggleOpenWithUserAction(true)
    }
    var delegate: SectionHeaderViewDelegate?

    func toggleOpenWithUserAction(userAction: Bool) {
        self.disclosureButton.selected = !self.disclosureButton.selected

        if userAction {
            if self.disclosureButton.selected {
                self.delegate?.sectionHeaderView(self, sectionClosed: self.section!)
            } else {
                self.delegate?.sectionHeaderView(self, sectionOpened: self.section!)
            }
        }
    }

    override func awakeFromNib() {
        var tapGesture: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "toggleOpen")
        self.addGestureRecognizer(tapGesture)
        // change the button image here, you can also set image via IB.
        self.disclosureButton.setImage(UIImage(named: "arrow_up"), forState: UIControlState.Selected)
        self.disclosureButton.setImage(UIImage(named: "arrow_down"), forState: UIControlState.Normal)
    }

}

的 SectionHeaderView.xib（与灰色背景视图）应该是这个样子的实现代码如下（你可以根据自己的需要定制它，当然）：

注意：

a）的 toggleOpen动作应与disclosureButton

b）disclosureButton和toggleOpen动作是不必要的。如果不需要按钮，则可以删除这2件事。

2.创建 SectionInfo.swift

import UIKit

class SectionInfo: NSObject {
    var open: Bool = true
    var itemsInSection: NSMutableArray = []
    var sectionTitle: String?

    init(itemsInSection: NSMutableArray, sectionTitle: String) {
        self.itemsInSection = itemsInSection
        self.sectionTitle = sectionTitle
    }
}

3.在您的表视图中

import UIKit

class TableViewController: UITableViewController, SectionHeaderViewDelegate  {

    let SectionHeaderViewIdentifier = "SectionHeaderViewIdentifier"

    var sectionInfoArray: NSMutableArray = []

    override func viewDidLoad() {
        super.viewDidLoad()

        let sectionHeaderNib: UINib = UINib(nibName: "SectionHeaderView", bundle: nil)
        self.tableView.registerNib(sectionHeaderNib, forHeaderFooterViewReuseIdentifier: SectionHeaderViewIdentifier)

        // you can change section height based on your needs
        self.tableView.sectionHeaderHeight = 30

        // You should set up your SectionInfo here
        var firstSection: SectionInfo = SectionInfo(itemsInSection: ["1"], sectionTitle: "firstSection")
        var secondSection: SectionInfo = SectionInfo(itemsInSection: ["2"], sectionTitle: "secondSection"))
        sectionInfoArray.addObjectsFromArray([firstSection, secondSection])
    }

    // MARK: - Table view data source

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return sectionInfoArray.count
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if self.sectionInfoArray.count > 0 {
            var sectionInfo: SectionInfo = sectionInfoArray[section] as! SectionInfo
            if sectionInfo.open {
                return sectionInfo.open ? sectionInfo.itemsInSection.count : 0
            }
        }
        return 0
    }

    override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        let sectionHeaderView: SectionHeaderView! = self.tableView.dequeueReusableHeaderFooterViewWithIdentifier(SectionHeaderViewIdentifier) as! SectionHeaderView
        var sectionInfo: SectionInfo = sectionInfoArray[section] as! SectionInfo

        sectionHeaderView.titleLabel.text = sectionInfo.sectionTitle
        sectionHeaderView.section = section
        sectionHeaderView.delegate = self
        let backGroundView = UIView()
        // you can customize the background color of the header here
        backGroundView.backgroundColor = UIColor(red:0.89, green:0.89, blue:0.89, alpha:1)
        sectionHeaderView.backgroundView = backGroundView
        return sectionHeaderView
    }

    func sectionHeaderView(sectionHeaderView: SectionHeaderView, sectionOpened: Int) {
        var sectionInfo: SectionInfo = sectionInfoArray[sectionOpened] as! SectionInfo
        var countOfRowsToInsert = sectionInfo.itemsInSection.count
        sectionInfo.open = true

        var indexPathToInsert: NSMutableArray = NSMutableArray()
        for i in 0..<countOfRowsToInsert {
            indexPathToInsert.addObject(NSIndexPath(forRow: i, inSection: sectionOpened))
        }
        self.tableView.insertRowsAtIndexPaths(indexPathToInsert as [AnyObject], withRowAnimation: .Top)
    }

    func sectionHeaderView(sectionHeaderView: SectionHeaderView, sectionClosed: Int) {
        var sectionInfo: SectionInfo = sectionInfoArray[sectionClosed] as! SectionInfo
        var countOfRowsToDelete = sectionInfo.itemsInSection.count
        sectionInfo.open = false
        if countOfRowsToDelete > 0 {
            var indexPathToDelete: NSMutableArray = NSMutableArray()
            for i in 0..<countOfRowsToDelete {
                indexPathToDelete.addObject(NSIndexPath(forRow: i, inSection: sectionClosed))
            }
            self.tableView.deleteRowsAtIndexPaths(indexPathToDelete as [AnyObject], withRowAnimation: .Top)
        }
    }
}

为了在iOS中实现可折叠表格部分，魔术在于如何控制每个部分的行数，或者我们可以管理每个部分的行高。

另外，我们需要自定义节标题，以便我们可以从标题区域（无论是按钮还是整个标题）监听tap事件。

标题如何处理？这很简单，我们扩展了UITableViewCell类并创建了一个自定义标头单元格，如下所示：

import UIKit

class CollapsibleTableViewHeader: UITableViewCell {

    @IBOutlet var titleLabel: UILabel!
    @IBOutlet var toggleButton: UIButton!

}

然后使用viewForHeaderInSection连接标题单元格：

override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
  let header = tableView.dequeueReusableCellWithIdentifier("header") as! CollapsibleTableViewHeader

  header.titleLabel.text = sections[section].name
  header.toggleButton.tag = section
  header.toggleButton.addTarget(self, action: #selector(CollapsibleTableViewController.toggleCollapse), forControlEvents: .TouchUpInside)

  header.toggleButton.rotate(sections[section].collapsed! ? 0.0 : CGFloat(M_PI_2))

  return header.contentView
}

请记住，我们必须返回contentView，因为此函数希望返回UIView。

现在让我们来处理可折叠部分，这是切换每个部分可折叠道具的切换功能：

func toggleCollapse(sender: UIButton) {
  let section = sender.tag
  let collapsed = sections[section].collapsed

  // Toggle collapse
  sections[section].collapsed = !collapsed

  // Reload section
  tableView.reloadSections(NSIndexSet(index: section), withRowAnimation: .Automatic)
}

取决于您如何管理部门数据，在这种情况下，我拥有部门数据，如下所示：

struct Section {
  var name: String!
  var items: [String]!
  var collapsed: Bool!

  init(name: String, items: [String]) {
    self.name = name
    self.items = items
    self.collapsed = false
  }
}

var sections = [Section]()

sections = [
  Section(name: "Mac", items: ["MacBook", "MacBook Air", "MacBook Pro", "iMac", "Mac Pro", "Mac mini", "Accessories", "OS X El Capitan"]),
  Section(name: "iPad", items: ["iPad Pro", "iPad Air 2", "iPad mini 4", "Accessories"]),
  Section(name: "iPhone", items: ["iPhone 6s", "iPhone 6", "iPhone SE", "Accessories"])
]

最后，我们需要基于每个部分的可折叠属性来控制该部分的行数：

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
  return (sections[section].collapsed!) ? 0 : sections[section].items.count
}

我在Github上有一个完全正常的演示：https : //github.com/jeantimex/ios-swift-collapsible-table-section

如果要在分组样式表中实现可折叠部分，请在此处查看另一个带有源代码的演示：https : //github.com/jeantimex/ios-swift-collapsible-table-section-in-grouped-section

希望有帮助。

我有一个更好的解决方案，您应该在部分标题中添加一个UIButton并将此按钮的大小设置为与部分大小相等，但是将其隐藏为清晰的背景色，之后您可以轻松查看单击了哪个部分以展开或折叠

我最终只是创建了一个包含按钮的headerView（事后，我在上面看到了Son Nguyen的解决方案，但是这是我的代码。它看起来很多，但很简单）：

为您声明几个小节

bool customerIsCollapsed = NO;
bool siteIsCollapsed = NO;

...码

现在在您的tableview委托方法中...

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    UIView *headerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, _tblSearchResults.frame.size.width, 35)];

    UILabel *lblSection = [UILabel new];
    [lblSection setFrame:CGRectMake(0, 0, 300, 30)];
    [lblSection setFont:[UIFont fontWithName:@"Helvetica-Bold" size:17]];
    [lblSection setBackgroundColor:[UIColor clearColor]];
    lblSection.alpha = 0.5;
    if(section == 0)
    {
        if(!customerIsCollapsed)
            [lblSection setText:@"Customers    --touch to show--"];
        else
            [lblSection setText:@"Customers    --touch to hide--"];
    }
    else
    {
        if(!siteIsCollapsed)
            [lblSection setText:@"Sites    --touch to show--"];
        else
            [lblSection setText:@"Sites    --touch to hide--"];    }

    UIButton *btnCollapse = [UIButton buttonWithType:UIButtonTypeCustom];
    [btnCollapse setFrame:CGRectMake(0, 0, _tblSearchResults.frame.size.width, 35)];
    [btnCollapse setBackgroundColor:[UIColor clearColor]];
    [btnCollapse addTarget:self action:@selector(touchedSection:) forControlEvents:UIControlEventTouchUpInside];
    btnCollapse.tag = section;


    [headerView addSubview:lblSection];
    [headerView addSubview:btnCollapse];

    return headerView;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    if(section == 0)
    {
        if(customerIsCollapsed)
            return 0;
        else
            return _customerArray.count;
    }
    else if (section == 1)
    {
        if(siteIsCollapsed)
            return 0;
        else
        return _siteArray.count;

    }
    return 0;
}

最后，当您触摸部分标题按钮之一时调用的函数：

- (IBAction)touchedSection:(id)sender
{
    UIButton *btnSection = (UIButton *)sender;

    if(btnSection.tag == 0)
    {
        NSLog(@"Touched Customers header");
        if(!customerIsCollapsed)
            customerIsCollapsed = YES;
        else
            customerIsCollapsed = NO;

    }
    else if(btnSection.tag == 1)
    {
        NSLog(@"Touched Site header");
        if(!siteIsCollapsed)
            siteIsCollapsed = YES;
        else
            siteIsCollapsed = NO;

    }
    [_tblSearchResults reloadData];
}

这是我发现创建可扩展表格视图单元格的最佳方法

.h文件

  NSMutableIndexSet *expandedSections;

.m文件

if (!expandedSections)
    {
        expandedSections = [[NSMutableIndexSet alloc] init];
    }
   UITableView *masterTable = [[UITableView alloc] initWithFrame:CGRectMake(0,100,1024,648) style:UITableViewStyleGrouped];
    masterTable.delegate = self;
    masterTable.dataSource = self;
    [self.view addSubview:masterTable];

表格视图委托方法

- (BOOL)tableView:(UITableView *)tableView canCollapseSection:(NSInteger)section
{
    // if (section>0) return YES;

    return YES;
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 4;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if ([self tableView:tableView canCollapseSection:section])
    {
        if ([expandedSections containsIndex:section])
        {
            return 5; // return rows when expanded
        }

        return 1; // only top row showing
    }

    // Return the number of rows in the section.
    return 1;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] ;
    }

    // Configure the cell...

    if ([self tableView:tableView canCollapseSection:indexPath.section])
    {
        if (!indexPath.row)
        {
            // first row
            cell.textLabel.text = @"Expandable"; // only top row showing

            if ([expandedSections containsIndex:indexPath.section])
            {

                UIImageView *imView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"UITableContract"]];
                cell.accessoryView = imView;
            }
            else
            {

                UIImageView *imView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"UITableExpand"]];
                cell.accessoryView = imView;
            }
        }
        else
        {
            // all other rows
            if (indexPath.section == 0) {
                cell.textLabel.text = @"section one";
            }else if (indexPath.section == 1) {
                cell.textLabel.text = @"section 2";
            }else if (indexPath.section == 2) {
                cell.textLabel.text = @"3";
            }else {
                cell.textLabel.text = @"some other sections";
            }

            cell.accessoryView = nil;
            cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
        }
    }
    else
    {
        cell.accessoryView = nil;
        cell.textLabel.text = @"Normal Cell";

    }

    return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if ([self tableView:tableView canCollapseSection:indexPath.section])
    {
        if (!indexPath.row)
        {
            // only first row toggles exapand/collapse
            [tableView deselectRowAtIndexPath:indexPath animated:YES];

            NSInteger section = indexPath.section;
            BOOL currentlyExpanded = [expandedSections containsIndex:section];
            NSInteger rows;


            NSMutableArray *tmpArray = [NSMutableArray array];

            if (currentlyExpanded)
            {
                rows = [self tableView:tableView numberOfRowsInSection:section];
                [expandedSections removeIndex:section];

            }
            else
            {
                [expandedSections addIndex:section];
                rows = [self tableView:tableView numberOfRowsInSection:section];
            }


            for (int i=1; i<rows; i++)
            {
                NSIndexPath *tmpIndexPath = [NSIndexPath indexPathForRow:i 
                                                               inSection:section];
                [tmpArray addObject:tmpIndexPath];
            }

            UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

            if (currentlyExpanded)
            {
                [tableView deleteRowsAtIndexPaths:tmpArray 
                                 withRowAnimation:UITableViewRowAnimationTop];

                UIImageView *imView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"UITableExpand"]];
                cell.accessoryView = imView;
            }
            else
            {
                [tableView insertRowsAtIndexPaths:tmpArray 
                                 withRowAnimation:UITableViewRowAnimationTop];

                UIImageView *imView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"UITableContract"]];
                cell.accessoryView = imView;
            }
        }
    }

    NSLog(@"section :%d,row:%d",indexPath.section,indexPath.row);

}

因此，基于“页眉中的按钮”解决方案，这是一个简洁的实现：

• 您可以跟踪属性中的折叠（或展开）部分
• 您用部分索引标记按钮
• 您可以在该按钮上设置选定状态以更改箭头方向（例如△和▽）

这是代码：

@interface MyTableViewController ()
@property (nonatomic, strong) NSMutableIndexSet *collapsedSections;
@end

...

@implementation MyTableViewController

- (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (!self)
        return;
    self.collapsedSections = [NSMutableIndexSet indexSet];
    return self;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // if section is collapsed
    if ([self.collapsedSections containsIndex:section])
        return 0;

    // if section is expanded
#warning incomplete implementation
    return [super tableView:tableView numberOfRowsInSection:section];
}

- (IBAction)toggleSectionHeader:(UIView *)sender
{
    UITableView *tableView = self.tableView;
    NSInteger section = sender.tag;

    MyTableViewHeaderFooterView *headerView = (MyTableViewHeaderFooterView *)[self tableView:tableView viewForHeaderInSection:section];

    if ([self.collapsedSections containsIndex:section])
    {
        // section is collapsed
        headerView.button.selected = YES;
        [self.collapsedSections removeIndex:section];
    }
    else
    {
        // section is expanded
        headerView.button.selected = NO;
        [self.collapsedSections addIndex:section];
    }

    [tableView beginUpdates];
    [tableView reloadSections:[NSIndexSet indexSetWithIndex:section] withRowAnimation:UITableViewRowAnimationAutomatic];
    [tableView endUpdates];
}

@end

我找到了解决这个问题的另一种相对简单的方法。通过使用此方法，我们将不需要更改几乎总是与数据数组索引相关的单元格，从而可能导致视图控制器混乱。

首先，我们将此以下属性添加到控制器类中：

@property (strong, nonatomic) NSMutableArray* collapsedSections;
@property (strong, nonatomic) NSMutableArray* sectionViews;

collapsedSections将保存折叠的节号。 sectionViews将存储我们的自定义剖面图。

合成它：

@synthesize collapsedSections;
@synthesize sectionViews;

初始化它：

- (void) viewDidLoad
{
    [super viewDidLoad];

    self.collapsedSections = [NSMutableArray array];
    self.sectionViews      = [NSMutableArray array];
}

之后，我们必须连接UITableView，以便可以从我们的视图控制器类中对其进行访问：

@property (strong, nonatomic) IBOutlet UITableView *tblMain;

ctrl + drag通常将其从XIB连接到视图控制器。

然后，通过实现以下UITableView委托，将视图创建为表视图的自定义节头：

- (UIView*) tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    // Create View
    CGRect frame = CGRectZero;

    frame.origin = CGPointZero;

    frame.size.height = 30.f;
    frame.size.width  = tableView.bounds.size.width;

    UIView* view = [[UIView alloc] initWithFrame:frame];

    [view setBackgroundColor:[UIColor blueColor]];

    // Add label for title
    NSArray* titles = @[@"Title 1", @"Title 2", @"Title 3"];

    NSString* selectedTitle = [titles objectAtIndex:section];

    CGRect labelFrame = frame;

    labelFrame.size.height = 30.f;
    labelFrame.size.width -= 20.f;
    labelFrame.origin.x += 10.f;

    UILabel* titleLabel = [[UILabel alloc] initWithFrame:labelFrame];

    [titleLabel setText:selectedTitle];
    [titleLabel setTextColor:[UIColor whiteColor]];

    [view addSubview:titleLabel];

    // Add touch gesture
    [self attachTapGestureToView:view];

    // Save created view to our class property array
    [self saveSectionView:view inSection:section];

    return view;
}

接下来，我们实现将以前创建的自定义节标题保存在class属性中的方法：

- (void) saveSectionView:(UIView*) view inSection:(NSInteger) section
{
    NSInteger sectionCount = [self numberOfSectionsInTableView:[self tblMain]];

    if(section < sectionCount)
    {
        if([[self sectionViews] indexOfObject:view] == NSNotFound)
        {
            [[self sectionViews] addObject:view];
        }
    }
}

添加UIGestureRecognizerDelegate到我们的视图控制器.h文件：

@interface MyViewController : UIViewController<UITableViewDelegate, UITableViewDataSource, UIGestureRecognizerDelegate>

然后我们创建方法 attachTapGestureToView:

- (void) attachTapGestureToView:(UIView*) view
{
    UITapGestureRecognizer* tapAction = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onTap:)];

    [tapAction setDelegate:self];

    [view addGestureRecognizer:tapAction];
}

上面的方法会将轻击手势识别器添加到我们之前创建的所有剖视图中。接下来我们应该实现onTap:选择器

- (void) onTap:(UITapGestureRecognizer*) gestureRecognizer
{
    // Take view who attach current recognizer
    UIView* sectionView = [gestureRecognizer view]; 

    // [self sectionViews] is Array containing our custom section views
    NSInteger section = [self sectionNumberOfView:sectionView];

    // [self tblMain] is our connected IBOutlet table view
    NSInteger sectionCount = [self numberOfSectionsInTableView:[self tblMain]];

    // If section more than section count minus one set at last
    section = section > (sectionCount - 1) ? 2 : section;

    [self toggleCollapseSection:section];
}

当用户点击任意一个表格视图部分时，将调用上述方法。此方法根据我们的搜索正确的段号sectionViews我们之前创建数组。

另外，我们实现了获取标题视图所属部分的方法。

- (NSInteger) sectionNumberOfView:(UIView*) view
{
    UILabel* label = [[view subviews] objectAtIndex:0];

    NSInteger sectionNum = 0;

    for(UIView* sectionView in [self sectionViews])
    {
        UILabel* sectionLabel = [[sectionView subviews] objectAtIndex:0];

        //NSLog(@"Section: %d -> %@ vs %@", sectionNum, [label text], [sectionLabel text]);

        if([[label text] isEqualToString:[sectionLabel text]])
        {
            return sectionNum;
        }

        sectionNum++;
    }

    return NSNotFound;
}

接下来，我们必须实现方法 toggleCollapseSection:

- (void) toggleCollapseSection:(NSInteger) section
{
    if([self isCollapsedSection:section])
    {
        [self removeCollapsedSection:section];
    }
    else
    {
        [self addCollapsedSection:section];
    }

    [[self tblMain] reloadSections:[NSIndexSet indexSetWithIndex:section] withRowAnimation:UITableViewRowAnimationFade];
}

此方法会将节号插入/删除到我们的 collapsedSections之前创建数组中。将节号插入该数组时，这意味着该节应折叠并展开，否则。

接下来我们执行removeCollapsedSection:，addCollapsedSection:section并isCollapsedSection:section

- (BOOL)isCollapsedSection:(NSInteger) section
{
    for(NSNumber* existing in [self collapsedSections])
    {
        NSInteger current = [existing integerValue];

        if(current == section)
        {
            return YES;
        }
    }

    return NO;
}

- (void)removeCollapsedSection:(NSInteger) section
{
    [[self collapsedSections] removeObjectIdenticalTo:[NSNumber numberWithInteger:section]];
}

- (void)addCollapsedSection:(NSInteger) section
{
    [[self collapsedSections] addObject:[NSNumber numberWithInteger:section]];
}

这三种方法只是帮助我们更轻松地访问 collapsedSections数组的。

最后，实现此表视图委托，以便我们的自定义截面视图看起来不错。

- (CGFloat) tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    return 30.f; // Same as each custom section view height
}

希望能帮助到你。

我已经使用了NSDictionary作为数据源，这看起来像很多代码，但它确实很简单，并且效果很好！ 这里看起来如何

我为这些部分创建了一个枚举

typedef NS_ENUM(NSUInteger, TableViewSection) {

    TableViewSection0 = 0,
    TableViewSection1,
    TableViewSection2,
    TableViewSectionCount
};

区段属性：

@property (nonatomic, strong) NSMutableDictionary * sectionsDisctionary;

一种返回我的部分的方法：

-(NSArray <NSNumber *> * )sections{

    return @[@(TableViewSection0), @(TableViewSection1), @(TableViewSection2)];
}

然后设置我的数据源：

-(void)loadAndSetupData{

    self.sectionsDisctionary = [NSMutableDictionary dictionary];

    NSArray * sections = [self sections];

    for (NSNumber * section in sections) {

    NSArray * sectionObjects = [self objectsForSection:section.integerValue];

    [self.sectionsDisctionary setObject:[NSMutableDictionary dictionaryWithDictionary:@{@"visible" : @YES, @"objects" : sectionObjects}] forKey:section];
    }
}

-(NSArray *)objectsForSection:(NSInteger)section{

    NSArray * objects;

    switch (section) {

        case TableViewSection0:

            objects = @[] // objects for section 0;
            break;

        case TableViewSection1:

            objects = @[] // objects for section 1;
            break;

        case TableViewSection2:

            objects = @[] // objects for section 2;
            break;

        default:
            break;
    }

    return objects;
}

下一个方法将帮助您了解何时打开一个节以及如何响应tableview数据源：

对数据源进行响应：

/**
 *  Asks the delegate for a view object to display in the header of the specified section of the table view.
 *
 *  @param tableView The table-view object asking for the view object.
 *  @param section   An index number identifying a section of tableView .
 *
 *  @return A view object to be displayed in the header of section .
 */
- (UIView *) tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{

    NSString * headerName = [self titleForSection:section];

    YourCustomSectionHeaderClass * header = (YourCustomSectionHeaderClass *)[tableView dequeueReusableHeaderFooterViewWithIdentifier:YourCustomSectionHeaderClassIdentifier];

    [header setTag:section];
    [header addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture:)]];
    header.title = headerName;
    header.collapsed = [self sectionIsOpened:section];


    return header;
}

/**
 * Asks the data source to return the number of sections in the table view
 *
 * @param An object representing the table view requesting this information.
 * @return The number of sections in tableView.
 */
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    // Return the number of sections.

    return self.sectionsDisctionary.count;
}

/**
 * Tells the data source to return the number of rows in a given section of a table view
 *
 * @param tableView: The table-view object requesting this information.
 * @param section: An index number identifying a section in tableView.
 * @return The number of rows in section.
 */
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

    BOOL sectionOpened = [self sectionIsOpened:section];
    return sectionOpened ? [[self objectsForSection:section] count] : 0;
}

工具：

/**
 Return the section at the given index

 @param index the index

 @return The section in the given index
 */
-(NSMutableDictionary *)sectionAtIndex:(NSInteger)index{

    NSString * asectionKey = [self.sectionsDisctionary.allKeys objectAtIndex:index];

    return [self.sectionsDisctionary objectForKey:asectionKey];
}

/**
 Check if a section is currently opened

 @param section the section to check

 @return YES if is opened
 */
-(BOOL)sectionIsOpened:(NSInteger)section{

    NSDictionary * asection = [self sectionAtIndex:section];
    BOOL sectionOpened = [[asection objectForKey:@"visible"] boolValue];

    return sectionOpened;
}


/**
 Handle the section tap

 @param tap the UITapGestureRecognizer
 */
- (void)handleTapGesture:(UITapGestureRecognizer*)tap{

    NSInteger index = tap.view.tag;

    [self toggleSection:index];
}

切换部分可见性

/**
 Switch the state of the section at the given section number

 @param section the section number
 */
-(void)toggleSection:(NSInteger)section{

    if (index >= 0){

        NSMutableDictionary * asection = [self sectionAtIndex:section];

        [asection setObject:@(![self sectionIsOpened:section]) forKey:@"visible"];

        [self.tableView reloadSections:[NSIndexSet indexSetWithIndex:section] withRowAnimation:UITableViewRowAnimationFade];
    }
}

// -------------------------------------------------------------------------------
//  tableView:viewForHeaderInSection:
// -------------------------------------------------------------------------------
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {

    UIView *mView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 20, 20)];
    [mView setBackgroundColor:[UIColor greenColor]];

    UIImageView *logoView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 5, 20, 20)];
    [logoView setImage:[UIImage imageNamed:@"carat.png"]];
    [mView addSubview:logoView];

    UIButton *bt = [UIButton buttonWithType:UIButtonTypeCustom];
    [bt setFrame:CGRectMake(0, 0, 150, 30)];
    [bt setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
    [bt setTag:section];
    [bt.titleLabel setFont:[UIFont systemFontOfSize:20]];
    [bt.titleLabel setTextAlignment:NSTextAlignmentCenter];
    [bt.titleLabel setTextColor:[UIColor blackColor]];
    [bt setTitle: @"More Info" forState: UIControlStateNormal];
    [bt addTarget:self action:@selector(addCell:) forControlEvents:UIControlEventTouchUpInside];
    [mView addSubview:bt];
    return mView;

}

#pragma mark - Suppose you want to hide/show section 2... then
#pragma mark  add or remove the section on toggle the section header for more info

- (void)addCell:(UIButton *)bt{

    // If section of more information
    if(bt.tag == 2) {

        // Initially more info is close, if more info is open
        if(ifOpen) {
            DLog(@"close More info");

            // Set height of section
            heightOfSection = 0.0f;

            // Reset the parameter that more info is closed now
            ifOpen = NO;
        }else {
            // Set height of section
            heightOfSection = 45.0f;
            // Reset the parameter that more info is closed now
            DLog(@"open more info again");
            ifOpen = YES;
        }
        //[self.tableView reloadData];
        [self.tableView reloadSections:[NSIndexSet indexSetWithIndex:2] withRowAnimation:UITableViewRowAnimationFade];
    }

}// end addCell
#pragma mark -
#pragma mark  What will be the height of the section, Make it dynamic

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{

    if (indexPath.section == 2) {
        return heightOfSection;
    }else {
        return 45.0f;
    }

// vKj

This action will happen in your didSelectRowAtIndexPath, when you will try to hide or show number of cell in a  section

first of all declare a global variable numberOfSectionInMoreInfo in .h file and in your viewDidLoad set suppose to numberOfSectionInMoreInfo = 4.

Now use following logic: 


 // More info link
        if(row == 3) {

            /*Logic: We are trying to hide/show the number of row into more information section */

            NSString *log= [NSString stringWithFormat:@"Number of section in more %i",numberOfSectionInMoreInfo];

            [objSpineCustomProtocol showAlertMessage:log];

            // Check if the number of rows are open or close in view
            if(numberOfSectionInMoreInfo > 4) {

                // close the more info toggle
                numberOfSectionInMoreInfo = 4;

            }else {

                // Open more info toggle
                numberOfSectionInMoreInfo = 9;

            }

            //reload this section
            [self.tableView reloadSections:[NSIndexSet indexSetWithIndex:1] withRowAnimation:UITableViewRowAnimationFade];

// vKj

扩展在这个答案用Objective C，我写这些文字在斯威夫特以下

想法是使用表中的节，并在点击该节中的第一行时将节中的行数设置为1（折叠）和3（扩展）

该表根据布尔值数组决定要绘制多少行

您需要在情节提要中创建两行，并为它们提供重用标识符“ CollapsingRow”和“ GroupHeading”

import UIKit

class CollapsingTVC:UITableViewController{

    var sectionVisibilityArray:[Bool]!// Array index corresponds to section in table

    override func viewDidLoad(){
        super.viewDidLoad()
        sectionVisibilityArray = [false,false,false]
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
    }

    override func numberOfSections(in tableView: UITableView) -> Int{
        return sectionVisibilityArray.count
    }
    override func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat{
        return 0
    }

    // numberOfRowsInSection - Get count of entries
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        var rowsToShow:Int = 0
        if(sectionVisibilityArray[section]){
            rowsToShow = 3 // Or however many rows should be displayed in that section
        }else{
            rowsToShow = 1
        }
        return rowsToShow
    }// numberOfRowsInSection


    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
        if(indexPath.row == 0){
            if(sectionVisibilityArray[indexPath.section]){
                sectionVisibilityArray[indexPath.section] = false
            }else{
                sectionVisibilityArray[indexPath.section] = true
            }
            self.tableView.reloadSections([indexPath.section], with: .automatic)
        }
    }

    // cellForRowAtIndexPath - Get table cell corresponding to this IndexPath
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        var cell:UITableViewCell

        if(indexPath.row == 0){
             cell = tableView.dequeueReusableCell(withIdentifier: "GroupHeading", for: indexPath as IndexPath)
        }else{
            cell = tableView.dequeueReusableCell(withIdentifier: "CollapsingRow", for: indexPath as IndexPath)
        }

        return cell

    }// cellForRowAtIndexPath

}

Apple在Table View Animations和Gestures中提供了一些使用table view section标头动画化展开/折叠动作的示例代码。

这种方法的关键是实施

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section

并返回一个自定义UIView，其中包含一个按钮（通常与标题视图本身的大小相同）。通过子类化UIView并将其用于标题视图（如本示例所示），您可以轻松存储其他数据，例如节号。

我已经使用多个部分完成了同一件事。

class SCTierBenefitsViewController: UIViewController {
    @IBOutlet private weak var tblTierBenefits: UITableView!
    private var selectedIndexPath: IndexPath?
    private var isSelected:Bool = false

    override func viewDidLoad() {
        super.viewDidLoad()

        tblTierBenefits.register(UINib(nibName:"TierBenefitsTableViewCell", bundle: nil), forCellReuseIdentifier:"TierBenefitsTableViewCell")
        tblTierBenefits.register(UINib(nibName:"TierBenefitsDetailsCell", bundle: nil), forCellReuseIdentifier:"TierBenefitsDetailsCell")

        tblTierBenefits.rowHeight = UITableViewAutomaticDimension;
        tblTierBenefits.estimatedRowHeight = 44.0;
        tblTierBenefits.tableFooterView = UIView()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

}

extension SCTierBenefitsViewController : UITableViewDataSource{

    func numberOfSections(in tableView: UITableView) -> Int {
        return 7
    }
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return (isSelected && section == selectedIndexPath?.section) ? 2 : 1 
    }

    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return  0.01
    }

    func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        return nil
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        switch indexPath.row {
        case 0:
            let cell:TierBenefitsTableViewCell = tableView.dequeueReusableCell(withIdentifier: "TierBenefitsTableViewCell")! as! TierBenefitsTableViewCell
            cell.selectionStyle = .none
            cell.contentView.setNeedsLayout()
            cell.contentView.layoutIfNeeded()
            return cell

        case 1:
            let cell:TierBenefitsDetailsCell = tableView.dequeueReusableCell(withIdentifier: "TierBenefitsDetailsCell")! as! TierBenefitsDetailsCell
            cell.selectionStyle = .none
            return cell

        default:
            break
        }

        return UITableViewCell()
    }
}

extension SCTierBenefitsViewController : UITableViewDelegate{

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        if indexPath.row == 0 {

            if let _selectedIndexPath = selectedIndexPath ,selectedIndexPath?.section == indexPath.section {
                tblTierBenefits.beginUpdates()
                expandCollapse(indexPath: _selectedIndexPath, isExpand: false)
                selectedIndexPath = nil
            }
            else{
                tblTierBenefits.beginUpdates()
                if selectedIndexPath != nil {
                    tblTierBenefits.reloadSections([(selectedIndexPath?.section)!], with: .none)
                }
                expandCollapse(indexPath: indexPath, isExpand: true)
            }
        }
    }

    private func  expandCollapse(indexPath: IndexPath?,isExpand: Bool){
        isSelected = isExpand
        selectedIndexPath = indexPath
        tblTierBenefits.reloadSections([(indexPath?.section)!], with: .none)
        tblTierBenefits.endUpdates()
    }

}

我将添加此解决方案以提高完整性，并说明如何使用节标题。

import UIKit

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    @IBOutlet var tableView: UITableView!
    var headerButtons: [UIButton]!
    var sections = [true, true, true]

    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.dataSource = self
        tableView.delegate = self

        let section0Button = UIButton(type: .detailDisclosure)
        section0Button.setTitle("Section 0", for: .normal)
        section0Button.addTarget(self, action: #selector(section0Tapped), for: .touchUpInside)

        let section1Button = UIButton(type: .detailDisclosure)
        section1Button.setTitle("Section 1", for: .normal)
        section1Button.addTarget(self, action: #selector(section1Tapped), for: .touchUpInside)

        let section2Button = UIButton(type: .detailDisclosure)
        section2Button.setTitle("Section 2", for: .normal)
        section2Button.addTarget(self, action: #selector(section2Tapped), for: .touchUpInside)

        headerButtons = [UIButton]()
        headerButtons.append(section0Button)
        headerButtons.append(section1Button)
        headerButtons.append(section2Button)
    }

    func numberOfSections(in tableView: UITableView) -> Int {
        return sections.count
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return sections[section] ? 3 : 0
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cellReuseId = "cellReuseId"
        let cell = UITableViewCell(style: .default, reuseIdentifier: cellReuseId)
        cell.textLabel?.text = "\(indexPath.section): \(indexPath.row)"
        return cell
    }

    func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        return headerButtons[section]
    }

    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return 44
    }

    @objc func section0Tapped() {
        sections[0] = !sections[0]
        tableView.reloadSections([0], with: .fade)
    }

    @objc func section1Tapped() {
        sections[1] = !sections[1]
        tableView.reloadSections([1], with: .fade)
    }

    @objc func section2Tapped() {
        sections[2] = !sections[2]
        tableView.reloadSections([2], with: .fade)
    }

}

链接到要点：https : //gist.github.com/pawelkijowskizimperium/fe1e8511a7932a0d40486a2669316d2c

为了支持@ jean.timex解决方案，如果您想随时打开一个部分，请使用以下代码。创建一个像这样的变量：var expandSection = -1;

func toggleSection(_ header: CollapsibleTableViewHeader, section: Int) {
    let collapsed = !sections[section].collapsed
    // Toggle collapse
    sections[section].collapsed = collapsed
    header.setCollapsed(collapsed)
    tableView.reloadSections(NSIndexSet(index: section) as IndexSet, with: .automatic)
    if (expandedSection >= 0 && expandedSection != section){
        sections[expandedSection].collapsed = true
        tableView.reloadSections(NSIndexSet(index: expandedSection) as IndexSet, with: .automatic)
    }
    expandedSection = section;
}