自定义 pageControl

自定义 pageControl

#import <UIKit/UIKit.h>#import <QuartzCore/QuartzCore.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;//init with default color;- (void)initData;@end@protocol PageControlDelegate<NSObject>@optional- (void)pageControlPageDidChange:(PageControl *)myPageControl;@end

#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];}- (void)initData{// Default colors.self.backgroundColor = [UIColor clearColor];self.dotColorCurrentPage = [UIColor blackColor];self.dotColorOtherPage = [UIColor lightGrayColor];}- (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;}- (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];    [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