如何更改UIPageControl的分页点的颜色？

Question

我正在开发一个应用程序,我想要更改UIPageControl分页点的颜色或图像.我该怎么改变它？是否可以UIpageControl在上述场景中进行自定义？

Answer 1

更新:

这个答案是6岁,非常过时,但它仍然吸引了投票和评论.从iOS 6.0开始,您应该使用pageIndicatorTintColor和currentPageIndicatorTintColor属性UIPageControl.

原始答案:

我今天遇到了这个问题,并决定编写自己的简单替换类.

它是一个子类UIView,它使用Core Graphics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.

如果您愿意,可以注册一个委托对象,以便在用户点击其中一个小页面点时收到通知.如果没有注册委托,则视图不会对触摸输入做出反应.

它从烤箱中完全新鲜,但似乎有效.如果您遇到任何问题,请告诉我.

未来的改进:

• 如果太多,请调整点的大小以适应当前边界.
• 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

Answer 2

在iOS 6中,您可以设置色调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色调颜色.

如果您的目标是iOS 5,请确保它不会崩溃:

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

Answer 3

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

适用于iOS6

Answer 4

如果有人想要它的ARC /现代版本(不需要将属性重新定义为ivar,不需要dealloc,并且可以使用Interface Builder):

#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

Answer 5

Heiberg提供的答案非常有效,但页面控件的行为与apple不同.

如果你希望页面控件的行为类似于来自apple的页面控件(如果你触摸下半部分,则总是将当前页面增加1,否则减少1),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]; 
    }   
}

Answer 6

将以下代码添加到AppDelegate中的DidFinishLauch,

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

希望这会有所帮助.

Answer 7

您可以通过将以下代码添加到方法中的appdelegate.m文件中来轻松修复它didFinishLaunchingWithOptions：

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

Answer 8

用它来编码

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

或者从故事板中,您可以从当前页面色调更改

Answer 9

在Swift中,UIPageViewController中的代码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()
}

Answer 10

添加到现有答案,可以像,