ios - 代码为iOS中的每个分页点赋予不同的颜色

是否可以为每个分页点设置不同的颜色？假设我有4个点，则意味着可以为iOS中的每个点提供4种不同的颜色吗？

最佳答案

http://muthesblog.blogspot.in/2011/11/custompagecontrol.html

通过在博客中使用以上代码，您将获得不同的颜色点，如下图所示，带有黄色矩形。

为了您的方便，添加代码

custompagecontrol的实现

PageControl *<pageControl> = [[[PageControl alloc] initWithFrame:f] autorelease];
<pageControl>.numberOfPages = 5;
<pageControl>.currentPage = 1;
<pageControl>.delegate = self;
[self.view addSubview:<pageControl>];

/// .h文件

#import <UIKit/UIKit.h>
@protocol PageControlDelegate;
@interface PageControl : UIView {
@private
    NSInteger _currentPage;
    NSInteger _numberOfPages;
    UIColor *dotColorCurrentPage;
    UIColor *dotColorOtherPage;
    NSObject<PageControlDelegate> *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, assign) NSObject<PageControlDelegate> *delegate;
@end
@protocol PageControlDelegate<NSObject>
@optional
- (void)pageControlPageDidChange:(PageControl *)pageControl;
@end

//.m文件

#import "PageControl.h"
// Tweak these or make them dynamic.
#define kDotDiameter 10.0
#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 greenColor];
        self.dotColorOtherPage = [UIColor whiteColor];
    }
    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<_numberOfPages; i++)
    {
        CGRect circleRect = CGRectMake(x, y, kDotDiameter, kDotDiameter);
        if (i == _currentPage)
        {
            CGContextSetFillColorWithColor(context, self.dotColorCurrentPage.CGColor);
        }
        else
        {
            if(i==0) {
                CGContextSetFillColorWithColor(context, [UIColor magentaColor].CGColor);

            } else if(i==1) {
                CGContextSetFillColorWithColor(context, [UIColor orangeColor].CGColor);

            } else if (i==2) {
                CGContextSetFillColorWithColor(context, [UIColor yellowColor].CGColor);

            } else if (i==3) {
                CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);
            } else if (i==4) {
                CGContextSetFillColorWithColor(context, [UIColor blueColor].CGColor);
            }
        }
        CGContextFillEllipseInRect(context, circleRect);
        x += kDotDiameter + kDotSpacer;
    }
}
- (void)dealloc {
    [dotColorCurrentPage release];
    [dotColorOtherPage 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