抽奖转盘

#import <UIKit/UIKit.h>

@interface WheelView :UIView

+ (instancetype)wheelView;

- (void)startAnimation;

- (void)stopAnimation;

@end

#import "WheelView.h"

#import "WButton.h"

@interface WheelView ()

@property (weak, nonatomic) IBOutletUIImageView *centerView;

@property (nonatomic,strong) UIButton *selectedBtn;

@property (nonatomic,strong) CADisplayLink *link;

- (IBAction)chooseNumber:(UIButton *)sender;

@end

@implementation WheelView

+ (instancetype)wheelView{

    return [[[NSBundlemainBundle] loadNibNamed:@"WheelView"owner:niloptions:nil]lastObject];

}

//添加按钮

- (void)awakeFromNib{

    self.centerView.userInteractionEnabled =YES;

    //大图片

   UIImage *img = [UIImageimageNamed:@"LuckyAstrology"];

   UIImage *imgSelected = [UIImageimageNamed:@"LuckyAstrologyPressed"];

    

    //从大图片中裁剪对应星座的图片

   CGFloat smallW = img.size.width /12 * [UIScreenmainScreen].scale;

    CGFloat smallH = img.size.height * [UIScreenmainScreen].scale;

    

    

    // 添加12个按钮

   for (int index =0; index < 12; index++) {

        WButton *btn = [WButtonbuttonWithType:UIButtonTypeCustom];

        

       CGRect smallRect = CGRectMake(index * smallW, 0, smallW, smallH);

        

        // CGImageCreateWithImageInRect只认像素

       CGImageRef smallImage = CGImageCreateWithImageInRect(img.CGImage, smallRect);

        [btn setImage:[UIImageimageWithCGImage:smallImage] forState:UIControlStateNormal];

        

       CGImageRef smallImageSelected = CGImageCreateWithImageInRect(imgSelected.CGImage, smallRect);

        [btn setImage:[UIImageimageWithCGImage:smallImageSelected] forState:UIControlStateSelected];

        

        [btn setBackgroundImage:[UIImageimageNamed:@"LuckyRototeSelected"]forState:UIControlStateSelected];

        btn.bounds =CGRectMake(0,0, 68, 143);

        

        // 设置锚点和位置

        btn.layer.anchorPoint =CGPointMake(0.5,1);

        btn.layer.position =CGPointMake(self.centerView.frame.size.width * 0.5, self.centerView.frame.size.height * 0.5);

        

        //设置旋转角度(绕着锚点进行旋转)

       CGFloat angle = (30 * index) /180.0 * M_PI;

        btn.transform =CGAffineTransformMakeRotation(angle);

        btn.layer.masksToBounds =YES;

        // 监听按钮点击

        [btn addTarget:selfaction:@selector(btnClick:)forControlEvents:UIControlEventTouchDown];

            [self.centerViewaddSubview:btn];

        btn.tag = index;

       //

       if (index == 0) {

            [selfbtnClick:btn];

        }

        }

}

#pragma mark - btnAction

- (void)btnClick:(WButton *)btn{

    self.selectedBtn.selected =NO;

    btn.selected =YES;

   self.selectedBtn = btn;

}

//核心动画不会改图层的属性,旋转式假象

//开始不停旋转

- (void)startAnimation{

   if (self.link) {

       return;

    }

    //1秒刷新60次

    CADisplayLink *link = [CADisplayLinkdisplayLinkWithTarget:selfselector:@selector(update)];

    [link addToRunLoop:[NSRunLoopmainRunLoop] forMode:NSDefaultRunLoopMode];

   self.link = link;

}

- (void)update{

    self.centerView.transform = CGAffineTransformRotate(self.centerView.transform,M_PI / 100);

}

- (void)stopAnimation{

    [self.linkinvalidate];

   self.link =nil;

}

- (IBAction)chooseNumber:(UIButton *)sender {

    [selfstopAnimation];

    CABasicAnimation *anim = [CABasicAnimationanimation];

    anim.keyPath =@"transform.rotation";

    anim.toValue =@(2 * M_PI *3);

    anim.duration =2;

    anim.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseInEaseOut];

    anim.delegate =self;

    [self.centerView.layeraddAnimation:anim forKey:nil];

    self.userInteractionEnabled =NO;

}

-(void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{

    self.userInteractionEnabled =YES;

    //选中的视图置顶居中

    self.centerView.transform = CGAffineTransformMakeRotation(-(self.selectedBtn.tag * M_PI / 6));

    

    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)),dispatch_get_main_queue(), ^{

        [selfstartAnimation];//1秒之后开始旋转

    });

}

@end

#import <UIKit/UIKit.h>

@interface WButton :UIButton

@end

#import "WButton.h"

@implementation WButton

- (CGRect)imageRectForContentRect:(CGRect)contentRect

{

   CGFloat imageW = 40;

   CGFloat imageH = 47;

   CGFloat imageX = (contentRect.size.width - imageW) *0.5;

   CGFloat imageY = 20;

   return CGRectMake(imageX, imageY, imageW, imageH);

}

- (void)setHighlighted:(BOOL)highlighted

{

    

}

@end

使用

#import "ViewController.h"

#import "WheelView.h"

@interface ViewController ()

- (IBAction)stop:(id)sender;

@property (nonatomic,strong) WheelView *wheel;

@end

@implementation ViewController

- (void)viewDidLoad {

    [superviewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

   WheelView *wheel = [WheelViewwheelView];

    wheel.center =CGPointMake(self.view.frame.size.width / 2, self.view.frame.size.height /2);

    [wheel startAnimation];

    [self.viewaddSubview:wheel];

   self.wheel = wheel;

    

}

demo:http://download.csdn.net/detail/baitxaps/8953773