如何更改UIPageControl的分页点的颜色？

我正在开发一个应用程序，我想在其中更改UIPageControl分页点的颜色或图像。我该如何更改？是否可以UIpageControl在上述情况下进行自定义？

更新：

这个答案已有6年历史，而且已经过时了，但是仍然吸引着投票和评论。从iOS 6.0开始，您应该在上使用pageIndicatorTintColor和currentPageIndicatorTintColor属性UIPageControl。

原始答案：

我今天遇到了这个问题，决定编写自己的简单替换类。

这是一个细分的UIView，它使用Core Graphics来以您指定的颜色渲染点。

您可以使用公开的属性来自定义和控制它。

如果需要，您可以注册一个委托对象，以在用户点击其中一个小页面点时获得通知。如果未注册任何委托，则视图将不响应触摸输入。

它完全是烤箱里新鲜的，但似乎可以用。让我知道您是否遇到任何问题。

未来的改进：

• 如果太多，请调整点的大小以适合当前范围。
• 不要在drawRect中重绘整个视图：

使用示例：

CGRect f = CGRectMake(0, 0, 320, 20); 
PageControl *pageControl = [[[PageControl alloc] initWithFrame:f] autorelease];
pageControl.numberOfPages = 10;
pageControl.currentPage = 5;
pageControl.delegate = self;
[self addSubview:pageControl];

头文件：

//
//  PageControl.h
//
//  Replacement for UIPageControl because that one only supports white dots.
//
//  Created by Morten Heiberg <morten@heiberg.net> on November 1, 2010.
//

#import <UIKit/UIKit.h>

@protocol PageControlDelegate;

@interface PageControl : UIView 
{
@private
    NSInteger _currentPage;
    NSInteger _numberOfPages;
    UIColor *dotColorCurrentPage;
    UIColor *dotColorOtherPage;
    NSObject<PageControlDelegate> *delegate;
    //If ARC use __unsafe_unretained id delegate;
}

// Set these to control the PageControl.
@property (nonatomic) NSInteger currentPage;
@property (nonatomic) NSInteger numberOfPages;

// Customize these as well as the backgroundColor property.
@property (nonatomic, retain) UIColor *dotColorCurrentPage;
@property (nonatomic, retain) UIColor *dotColorOtherPage;

// Optional delegate for callbacks when user taps a page dot.
@property (nonatomic, retain) NSObject<PageControlDelegate> *delegate;

@end

@protocol PageControlDelegate<NSObject>
@optional
- (void)pageControlPageDidChange:(PageControl *)pageControl;
@end

实施文件：

//
//  PageControl.m
//
//  Replacement for UIPageControl because that one only supports white dots.
//
//  Created by Morten Heiberg <morten@heiberg.net> on November 1, 2010.
//

#import "PageControl.h"

// Tweak these or make them dynamic.
#define kDotDiameter 7.0
#define kDotSpacer 7.0

@implementation PageControl

@synthesize dotColorCurrentPage;
@synthesize dotColorOtherPage;
@synthesize delegate;

- (NSInteger)currentPage
{
    return _currentPage;
}

- (void)setCurrentPage:(NSInteger)page
{
    _currentPage = MIN(MAX(0, page), _numberOfPages-1);
    [self setNeedsDisplay];
}

- (NSInteger)numberOfPages
{
    return _numberOfPages;
}

- (void)setNumberOfPages:(NSInteger)pages
{
    _numberOfPages = MAX(0, pages);
    _currentPage = MIN(MAX(0, _currentPage), _numberOfPages-1);
    [self setNeedsDisplay];
}

    - (id)initWithFrame:(CGRect)frame
{
    if ((self = [super initWithFrame:frame]))
    {
        // Default colors.
        self.backgroundColor = [UIColor clearColor];
        self.dotColorCurrentPage = [UIColor blackColor];
        self.dotColorOtherPage = [UIColor lightGrayColor];

        UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipedRight:)];
        [swipeRight setDirection:UISwipeGestureRecognizerDirectionRight];
        [self addGestureRecognizer:swipeRight];




        UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipedLeft:)];
        [swipe setDirection:UISwipeGestureRecognizerDirectionLeft];
        [self addGestureRecognizer:swipe];

    }
    return self;
}
-(void) swipedLeft:(UISwipeGestureRecognizer *) recognizer
{
    self.currentPage++;
}
-(void) swipedRight:(UISwipeGestureRecognizer *) recognizer
{
    self.currentPage--;
}

- (void)drawRect:(CGRect)rect 
{
    CGContextRef context = UIGraphicsGetCurrentContext();   
    CGContextSetAllowsAntialiasing(context, true);

    CGRect currentBounds = self.bounds;
    CGFloat dotsWidth = self.numberOfPages*kDotDiameter + MAX(0, self.numberOfPages-1)*kDotSpacer;
    CGFloat x = CGRectGetMidX(currentBounds)-dotsWidth/2;
    CGFloat y = CGRectGetMidY(currentBounds)-kDotDiameter/2;
    for (int i=0; i<_numberOfPages; i++)
    {
        CGRect circleRect = CGRectMake(x, y, kDotDiameter, kDotDiameter);
        if (i == _currentPage)
        {
            CGContextSetFillColorWithColor(context, self.dotColorCurrentPage.CGColor);
        }
        else
        {
            CGContextSetFillColorWithColor(context, self.dotColorOtherPage.CGColor);
        }
        CGContextFillEllipseInRect(context, circleRect);
        x += kDotDiameter + kDotSpacer;
    }
}

- (void)dealloc 
{
    [dotColorCurrentPage release];
    [dotColorOtherPage release];
    [delegate release];
    [super dealloc];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    if (!self.delegate) return;

    CGPoint touchPoint = [[[event touchesForView:self] anyObject] locationInView:self];

    CGFloat dotSpanX = self.numberOfPages*(kDotDiameter + kDotSpacer);
    CGFloat dotSpanY = kDotDiameter + kDotSpacer;

    CGRect currentBounds = self.bounds;
    CGFloat x = touchPoint.x + dotSpanX/2 - CGRectGetMidX(currentBounds);
    CGFloat y = touchPoint.y + dotSpanY/2 - CGRectGetMidY(currentBounds);

    if ((x<0) || (x>dotSpanX) || (y<0) || (y>dotSpanY)) return;

    self.currentPage = floor(x/(kDotDiameter+kDotSpacer));
    if ([self.delegate respondsToSelector:@selector(pageControlPageDidChange:)])
    {
        [self.delegate pageControlPageDidChange:self];
    }
}

@end

在iOS 6中，您可以设置的色调颜色UIPageControl：

有2个新属性：

• pageIndicatorTintColor
• currentPageIndicatorTintColor

您还可以使用外观API更改所有页面指示器的颜色。

如果您以iOS 5为目标，请确保它不会崩溃：

if ([pageControl respondsToSelector:@selector(setPageIndicatorTintColor:)]) {
    pageControl.pageIndicatorTintColor = [UIColor whiteColor];
}

pageControl.pageIndicatorTintColor = [UIColor redColor];
pageControl.currentPageIndicatorTintColor = [UIColor redColor];

适用于iOS6

如果有人想要它的ARC /现代版本（无需将属性重新定义为ivar，无需取消分配，并且可以与Interface Builder一起使用）：

#import <UIKit/UIKit.h>

@protocol PageControlDelegate;

@interface PageControl : UIView 

// Set these to control the PageControl.
@property (nonatomic) NSInteger currentPage;
@property (nonatomic) NSInteger numberOfPages;

// Customize these as well as the backgroundColor property.
@property (nonatomic, strong) UIColor *dotColorCurrentPage;
@property (nonatomic, strong) UIColor *dotColorOtherPage;

// Optional delegate for callbacks when user taps a page dot.
@property (nonatomic, weak) NSObject<PageControlDelegate> *delegate;

@end

@protocol PageControlDelegate<NSObject>
@optional
- (void)pageControlPageDidChange:(PageControl *)pageControl;
@end

PageControl.m：

#import "PageControl.h"


// Tweak these or make them dynamic.
#define kDotDiameter 7.0
#define kDotSpacer 7.0

@implementation PageControl

@synthesize dotColorCurrentPage;
@synthesize dotColorOtherPage;
@synthesize currentPage;
@synthesize numberOfPages;
@synthesize delegate;

- (void)setCurrentPage:(NSInteger)page
{
    currentPage = MIN(MAX(0, page), self.numberOfPages-1);
    [self setNeedsDisplay];
}

- (void)setNumberOfPages:(NSInteger)pages
{
    numberOfPages = MAX(0, pages);
    currentPage = MIN(MAX(0, self.currentPage), numberOfPages-1);
    [self setNeedsDisplay];
}

- (id)initWithFrame:(CGRect)frame 
{
    if (self = [super initWithFrame:frame]) 
    {
        // Default colors.
        self.backgroundColor = [UIColor clearColor];
        self.dotColorCurrentPage = [UIColor blackColor];
        self.dotColorOtherPage = [UIColor lightGrayColor];
    }
    return self;
}

-(id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super initWithCoder:aDecoder])
    {
        self.dotColorCurrentPage = [UIColor blackColor];
        self.dotColorOtherPage = [UIColor lightGrayColor];
    }
    return self;
}

- (void)drawRect:(CGRect)rect 
{
    CGContextRef context = UIGraphicsGetCurrentContext();   
    CGContextSetAllowsAntialiasing(context, true);

    CGRect currentBounds = self.bounds;
    CGFloat dotsWidth = self.numberOfPages*kDotDiameter + MAX(0, self.numberOfPages-1)*kDotSpacer;
    CGFloat x = CGRectGetMidX(currentBounds)-dotsWidth/2;
    CGFloat y = CGRectGetMidY(currentBounds)-kDotDiameter/2;
    for (int i=0; i<self.numberOfPages; i++)
    {
        CGRect circleRect = CGRectMake(x, y, kDotDiameter, kDotDiameter);
        if (i == self.currentPage)
        {
            CGContextSetFillColorWithColor(context, self.dotColorCurrentPage.CGColor);
        }
        else
        {
            CGContextSetFillColorWithColor(context, self.dotColorOtherPage.CGColor);
        }
        CGContextFillEllipseInRect(context, circleRect);
        x += kDotDiameter + kDotSpacer;
    }
}


- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    if (!self.delegate) return;

    CGPoint touchPoint = [[[event touchesForView:self] anyObject] locationInView:self];

    CGFloat dotSpanX = self.numberOfPages*(kDotDiameter + kDotSpacer);
    CGFloat dotSpanY = kDotDiameter + kDotSpacer;

    CGRect currentBounds = self.bounds;
    CGFloat x = touchPoint.x + dotSpanX/2 - CGRectGetMidX(currentBounds);
    CGFloat y = touchPoint.y + dotSpanY/2 - CGRectGetMidY(currentBounds);

    if ((x<0) || (x>dotSpanX) || (y<0) || (y>dotSpanY)) return;

    self.currentPage = floor(x/(kDotDiameter+kDotSpacer));
    if ([self.delegate respondsToSelector:@selector(pageControlPageDidChange:)])
    {
        [self.delegate pageControlPageDidChange:self];
    }
}

@end

海伯格提供的答案确实很好，但是页面控件的行为并不完全像苹果一样。

如果您希望页面控件的行为类似于苹果的页面控件（如果触摸后半部分，则始终将当前页面增加一，否则减少一），请尝试使用touchesBegan方法：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

    CGPoint touchPoint = [[[event touchesForView:self] anyObject] locationInView:self];

    CGRect currentBounds = self.bounds;
    CGFloat x = touchPoint.x - CGRectGetMidX(currentBounds);

    if(x<0 && self.currentPage>=0){
        self.currentPage--;
        [self.delegate pageControlPageDidChange:self]; 
    }
    else if(x>0 && self.currentPage<self.numberOfPages-1){
        self.currentPage++;
        [self.delegate pageControlPageDidChange:self]; 
    }   
}

将以下代码添加到AppDelegate中的DidFinishLauch中，

UIPageControl *pageControl = [UIPageControl appearance];
pageControl.pageIndicatorTintColor = [UIColor lightGrayColor];
pageControl.currentPageIndicatorTintColor = [UIColor blackColor];
pageControl.backgroundColor = [UIColor whiteColor];

希望这会有所帮助。

用它来编码

if ([pageControl respondsToSelector:@selector(setPageIndicatorTintColor:)]) {
    pageControl.pageIndicatorTintColor = [UIColor whiteColor];
}

或从情节提要中，您可以更改当前页面的色调

在Swift中，UIPageViewController内部的这段代码正在获取对页面指示器的引用并设置其属性

override func viewDidLoad() {
    super.viewDidLoad()

    //Creating the proxy
    let pageControl = UIPageControl.appearance()
    //Customizing
    pageControl.pageIndicatorTintColor = UIColor.lightGrayColor()
    pageControl.currentPageIndicatorTintColor = UIColor.darkGrayColor()
    //Setting the background of the view controller so the dots wont be on a black background   
    self.view.backgroundColor = UIColor.whiteColor()
}

添加到现有答案中，可以像

使用Swift 1.2很容易：

UIPageControl.appearance().pageIndicatorTintColor           = UIColor.lightGrayColor()
UIPageControl.appearance().currentPageIndicatorTintColor    = UIColor.redColor()

您可以通过在方法中将以下代码添加到appdelegate.m文件中来轻松解决此问题didFinishLaunchingWithOptions：

UIPageControl *pageControl = [UIPageControl appearance];
pageControl.pageIndicatorTintColor = [UIColor darkGrayColor];
pageControl.currentPageIndicatorTintColor = [UIColor orangeColor];
pageControl.backgroundColor = [UIColor whiteColor]

这适用于iOS 7。

pageControl.pageIndicatorTintColor = [UIColor purpleColor];
pageControl.currentPageIndicatorTintColor = [UIColor magentaColor];

从官方的角度来看，不可能使用iPhone SDK。您也许可以使用私有方法来做到这一点，但这将成为进入应用商店的障碍。

唯一安全的解决方案是创建您自己的页面控件，因为该页面控件仅显示滚动视图中当前显示的页面，所以这太困难了。

@Jasarien我认为您可以将UIPageControll子类化，这仅是从Apple doc中摘录的行，方法sizeForNumberOfPages方法中“自定义页面控件外观的子类可以使用此方法来在页面计数更改时调整页面控件的大小”：

您还可以使用Three20库，其中包含可设置样式的PageControl以及许多其他有用的UI控件和抽象。

万一Swift 2.0出现，下面的代码将起作用：

pageControl.pageIndicatorTintColor = UIColor.whiteColor()
pageControl.currentPageIndicatorTintColor = UIColor.redColor()

myView.superview.tintColor = [UIColor colorWithRed:1.0f  
                                      green:1.0f blue:1.0f alpha:1.0f];