我想列出中的所有子视图UIViewController
。我试过了self.view.subviews
,但并非所有子视图都列出来了,例如,UITableViewCell
找不到中的子视图。任何的想法?
Answers:
您必须递归地迭代子视图。
- (void)listSubviewsOfView:(UIView *)view {
// Get the subviews of the view
NSArray *subviews = [view subviews];
// Return if there are no subviews
if ([subviews count] == 0) return; // COUNT CHECK LINE
for (UIView *subview in subviews) {
// Do what you want to do with the subview
NSLog(@"%@", subview);
// List the subviews of subview
[self listSubviewsOfView:subview];
}
}
正如@Greg Meletic所说,您可以跳过上面的COUNT CHECK LINE。
recursiveDescription
,从@natbro答案- stackoverflow.com/a/8962824/429521
转储视图层次结构的xcode / gdb内置方法很有用-recursiveDescription,根据http://developer.apple.com/library/ios/#technotes/tn2239/_index.html
它输出一个更完整的视图层次结构,您可能会发现它有用:
> po [_myToolbar recursiveDescription]
<UIToolbarButton: 0xd866040; frame = (152 0; 15 44); opaque = NO; layer = <CALayer: 0xd864230>>
| <UISwappableImageView: 0xd8660f0; frame = (0 0; 0 0); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0xd86a160>>
[_myToolbar recursiveDescription]
在我的代码中或其他地方放置po的位置。
您需要递归打印,该方法还会根据视图的深度进行制表
-(void) printAllChildrenOfView:(UIView*) node depth:(int) d
{
//Tabs are just for formatting
NSString *tabs = @"";
for (int i = 0; i < d; i++)
{
tabs = [tabs stringByAppendingFormat:@"\t"];
}
NSLog(@"%@%@", tabs, node);
d++; //Increment the depth
for (UIView *child in node.subviews)
{
[self printAllChildrenOfView:child depth:d];
}
}
这是快速版本
func listSubviewsOfView(view:UIView){
// Get the subviews of the view
var subviews = view.subviews
// Return if there are no subviews
if subviews.count == 0 {
return
}
for subview : AnyObject in subviews{
// Do what you want to do with the subview
println(subview)
// List the subviews of subview
listSubviewsOfView(subview as UIView)
}
}
我参加聚会有点晚,但是更通用的解决方案是:
@implementation UIView (childViews)
- (NSArray*) allSubviews {
__block NSArray* allSubviews = [NSArray arrayWithObject:self];
[self.subviews enumerateObjectsUsingBlock:^( UIView* view, NSUInteger idx, BOOL*stop) {
allSubviews = [allSubviews arrayByAddingObjectsFromArray:[view allSubviews]];
}];
return allSubviews;
}
@end
如果您只需要一个UIView
s数组,则这是一个线性解决方案(Swift 4+):
extension UIView {
var allSubviews: [UIView] {
return self.subviews.reduce([UIView]()) { $0 + [$1] + $1.allSubviews }
}
}
extension UIView {
private func subviews(parentView: UIView, level: Int = 0, printSubviews: Bool = false) -> [UIView] {
var result = [UIView]()
if level == 0 && printSubviews {
result.append(parentView)
print("\(parentView.viewInfo)")
}
for subview in parentView.subviews {
if printSubviews { print("\(String(repeating: "-", count: level))\(subview.viewInfo)") }
result.append(subview)
if subview.subviews.isEmpty { continue }
result += subviews(parentView: subview, level: level+1, printSubviews: printSubviews)
}
return result
}
private var viewInfo: String { return "\(classForCoder), frame: \(frame))" }
var allSubviews: [UIView] { return subviews(parentView: self) }
func printSubviews() { _ = subviews(parentView: self, printSubviews: true) }
}
view.printSubviews()
print("\(view.allSubviews.count)")
以我的方式,UIView的类别或扩展比其他类别好得多,而递归是获取所有子视图的关键
学到更多:
https://github.com/ZhipingYang/XYDebugView
@implementation UIView (Recurrence)
- (NSArray<UIView *> *)recurrenceAllSubviews
{
NSMutableArray <UIView *> *all = @[].mutableCopy;
void (^getSubViewsBlock)(UIView *current) = ^(UIView *current){
[all addObject:current];
for (UIView *sub in current.subviews) {
[all addObjectsFromArray:[sub recurrenceAllSubviews]];
}
};
getSubViewsBlock(self);
return [NSArray arrayWithArray:all];
}
@end
例
NSArray *views = [viewController.view recurrenceAllSubviews];
extension UIView {
func recurrenceAllSubviews() -> [UIView] {
var all = [UIView]()
func getSubview(view: UIView) {
all.append(view)
guard view.subviews.count>0 else { return }
view.subviews.forEach{ getSubview(view: $0) }
}
getSubview(view: self)
return all
}
}
例
let views = viewController.view.recurrenceAllSubviews()
直接使用序列函数获取所有子视图
let viewSequence = sequence(state: [viewController.view]) { (state: inout [UIView] ) -> [UIView]? in
guard state.count > 0 else { return nil }
defer {
state = state.map{ $0.subviews }.flatMap{ $0 }
}
return state
}
let views = viewSequence.flatMap{ $0 }
未打印UITableViewCell中的子视图的原因是因为必须在顶层输出所有子视图。单元格的子视图不是视图的直接子视图。
为了获取UITableViewCell的子视图,您需要确定哪些子视图属于UITableViewCell(使用 isKindOfClass:
在打印循环中),然后遍历它的子视图
编辑:Easy UIView Debugging上的此博客文章可能会有所帮助
我写了一个类别来列出视图控制器所拥有的所有视图,这受以前发布的答案的启发。
@interface UIView (ListSubviewHierarchy)
- (NSString *)listOfSubviews;
@end
@implementation UIView (ListSubviewHierarchy)
- (NSInteger)depth
{
NSInteger depth = 0;
if ([self superview]) {
deepth = [[self superview] depth] + 1;
}
return depth;
}
- (NSString *)listOfSubviews
{
NSString * indent = @"";
NSInteger depth = [self depth];
for (int counter = 0; counter < depth; counter ++) {
indent = [indent stringByAppendingString:@" "];
}
__block NSString * listOfSubviews = [NSString stringWithFormat:@"\n%@%@", indent, [self description];
if ([self.subviews count] > 0) {
[self.subviews enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
UIView * subview = obj;
listOfSubviews = [listOfSubviews stringByAppendingFormat:@"%@", [subview listOfSubviews]];
}];
}
return listOfSubviews;
}
@end
要列出视图控制器持有的所有视图,只需列出NSLog("%@",[self listOfSubviews])
,其中self
表示视图控制器本身。虽然效率不高。
另外,您可以NSLog(@"\n%@", [(id)self.view performSelector:@selector(recursiveDescription)]);
用来做同样的事情,我认为它比我的实现更有效。
兼容Swift 2.0
这里是获取通用视图的所有子视图的递归方法:
extension UIView {
func subviewsList() -> [UIView] {
var subviews = self.subviews
if subviews.count == 0 {
return subviews + []
}
for v in subviews {
subviews += v.listSubviewsOfView()
}
return subviews
}
}
因此,您可以通过以下方式致电各地:
let view = FooController.view
let subviews = view.subviewsList()
这是对此答案的重写:
您必须首先获取要打印其所有子视图的对象的指针/引用。有时,您可能会发现通过其子视图访问该对象更容易找到该对象。喜欢po someSubview.superview
。这将为您提供以下信息:
Optional<UIView>
▿ some : <FacebookApp.WhatsNewView: 0x7f91747c71f0; frame = (30 50; 354 636); clipsToBounds = YES; layer = <CALayer: 0x6100002370e0>>
superview
0x7f91747c71f0
是指向超级视图的指针。要打印superView,必须使用断点。
现在执行此步骤,您只需单击“查看调试层次结构”即可。无需断点
然后,您可以轻松地执行以下操作:
po [0x7f91747c71f0 recursiveDescription]
对我来说,返回的内容是:
<FacebookApp.WhatsNewView: 0x7f91747c71f0; frame = (30 50; 354 636); clipsToBounds = YES; layer = <CALayer: 0x6100002370e0>>
| <UIStackView: 0x7f91747c75f0; frame = (45 60; 264 93); layer = <CATransformLayer: 0x610000230ec0>>
| | <UIImageView: 0x7f916ef38c30; frame = (10.6667 0; 243 58); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x61000003b840>>
| | <UIStackView: 0x7f91747c8230; frame = (44.6667 58; 174.667 35); layer = <CATransformLayer: 0x6100006278c0>>
| | | <FacebookApp.CopyableUILabel: 0x7f91747a80b0; baseClass = UILabel; frame = (44 0; 86.6667 16); text = 'What's New'; gestureRecognizers = <NSArray: 0x610000c4a770>; layer = <_UILabelLayer: 0x610000085550>>
| | | <FacebookApp.CopyableUILabel: 0x7f916ef396a0; baseClass = UILabel; frame = (0 21; 174.667 14); text = 'Version 14.0.5c Oct 05, 2...'; gestureRecognizers = <NSArray: 0x610000c498a0>; layer = <_UILabelLayer: 0x610000087300>>
| <UITextView: 0x7f917015ce00; frame = (45 183; 264 403); text = ' • new Adding new feature...'; clipsToBounds = YES; gestureRecognizers = <NSArray: 0x6100000538f0>; layer = <CALayer: 0x61000042f000>; contentOffset: {0, 0}; contentSize: {264, 890}>
| | <<_UITextContainerView: 0x7f9170a13350; frame = (0 0; 264 890); layer = <_UITextTiledLayer: 0x6080002c0930>> minSize = {0, 0}, maxSize = {1.7976931348623157e+308, 1.7976931348623157e+308}, textContainer = <NSTextContainer: 0x610000117b20 size = (264.000000,340282346638528859811704183484516925440.000000); widthTracksTextView = YES; heightTracksTextView = NO>; exclusionPaths = 0x61000001bc30; lineBreakMode = 0>
| | | <_UITileLayer: 0x60800023f8a0> (layer)
| | | <_UITileLayer: 0x60800023f3c0> (layer)
| | | <_UITileLayer: 0x60800023f360> (layer)
| | | <_UITileLayer: 0x60800023eca0> (layer)
| | <UIImageView: 0x7f9170a7d370; frame = (-39 397.667; 36 2.33333); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO; layer = <CALayer: 0x60800023f4c0>>
| | <UIImageView: 0x7f9170a7d560; frame = (258.667 -39; 2.33333 36); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled = NO; layer = <CALayer: 0x60800023f5e0>>
| <UIView: 0x7f916ef149c0; frame = (0 587; 354 0); layer = <CALayer: 0x6100006392a0>>
| <UIButton: 0x7f91747a8730; frame = (0 0; 0 0); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x610000639320>>
| | <UIButtonLabel: 0x7f916ef00a80; frame = (0 -5.66667; 0 16); text = 'See More Details'; opaque = NO; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x610000084d80>>
您可能已经猜到我的超级视图有4个子视图:
这对我来说是相当新的东西,但是它帮助我调试了视图的框架(以及文本和类型)。我的一个子视图没有显示在屏幕上,因此使用了recursiveDescription,我意识到我的一个0
子视图的宽度是...,所以我去纠正了它的约束,出现了子视图。
或者,如果您想从UIView扩展返回所有子视图(和嵌套子视图)的数组,请执行以下操作:
func getAllSubviewsRecursively() -> [AnyObject] {
var allSubviews: [AnyObject] = []
for subview in self.subviews {
if let subview = subview as? UIView {
allSubviews.append(subview)
allSubviews = allSubviews + subview.getAllSubviewsRecursively()
}
}
return allSubviews
}
AC#Xamarin版本:
void ListSubviewsOfView(UIView view)
{
var subviews = view.Subviews;
if (subviews.Length == 0) return;
foreach (var subView in subviews)
{
Console.WriteLine("Subview of type {0}", subView.GetType());
ListSubviewsOfView(subView);
}
}
或者,如果要查找特定类型的所有子视图,请使用:
List<T> FindViews<T>(UIView view)
{
List<T> allSubviews = new List<T>();
var subviews = view.Subviews.Where(x => x.GetType() == typeof(T)).ToList();
if (subviews.Count == 0) return allSubviews;
foreach (var subView in subviews)
{
allSubviews.AddRange(FindViews<T>(subView));
}
return allSubviews;
}
我已经完成了一个类别,UIView
只需调用传递索引的函数即可以漂亮的树格式打印它们。这只是James Webster发表答案的另一个选择。
#pragma mark - Views Tree
- (void)printSubviewsTreeWithIndex:(NSInteger)index
{
if (!self)
{
return;
}
NSString *tabSpace = @"";
@autoreleasepool
{
for (NSInteger x = 0; x < index; x++)
{
tabSpace = [tabSpace stringByAppendingString:@"\t"];
}
}
NSLog(@"%@%@", tabSpace, self);
if (!self.subviews)
{
return;
}
@autoreleasepool
{
for (UIView *subView in self.subviews)
{
[subView printViewsTreeWithIndex:index++];
}
}
}
希望对您有所帮助:)
- (NSString *)recusiveDescription:(UIView *)view
{
NSString *s = @"";
NSArray *subviews = [view subviews];
if ([subviews count] == 0) return @"no subviews";
for (UIView *subView in subviews) {
s = [NSString stringWithFormat:@"<%@; frame = (%f %f : %f %f) \n ",NSStringFromClass([subView class]), subView.frame.origin.x, subView.frame.origin.y ,subView.frame.size.width, subView.frame.size.height];
[self recusiveDescription:subView];
}
return s;
}