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效果
代码：
NYWheel
NYWheel.h
@interface NYWheel : UIView+ (instancetype)wheel;// 提供两个方法供外界调用开始和结束动画- (void)startRotating;- (void)stopRotating;@end
NYWheel.m
()/** * 转盘中间的图片 */@property (weak, nonatomic) IBOutlet UIImageView *centerWheel;//中间的开始按钮- (IBAction)startBtnClick:(id)sender;/** * 定义属性记录当前选中的按钮 */@property (nonatomic, weak) UIButton *selectButton;@property (nonatomic, strong) CADisplayLink *link;- (void)awakeFromNib{= YES;// 加载图片UIImage *norImage = [UIImage imageNamed:@”LuckyAstrology”];UIImage *selImage = [UIImage imageNamed:@”LuckyAstrologyPressed”];// 创建12个按钮添加到中间的轮盘上for (int index = 0; index < 12; index++) {// 1.创建按钮NYWheelButton *btn = [[NYWheelButton alloc] init];// 2.设置按钮选中状态的图片[btn setBackgroundImage:[UIImage imageNamed:@”LuckyRototeSelected”] forState:UIControlStateSelected];// 3.设置按钮的boundsbtn.bounds = CGRectMake(0, 0, 68, 143);// 4.设置按钮的锚点btn.layer.anchorPoint = CGPointMake(0.5, 1);// 5.设置按钮的positionbtn* * 0.5);angle = (30 * index)/180.0 * M_PI;btn.transform = CGAffineTransformMakeRotation(angle);// 7.监听按钮的点击事件[btn addTarget:self action:@selector(update:) forControlEvents:UIControlEventTouchUpInside];imageH = NYImageHeight * [UIScreen mainScreen].scale;CGFloat imageW = NYImageWidth * [UIScreen mainScreen].scale;CGFloat imageY = 0;CGFloat imageX = index * imageW;CGRect rect = CGRectMake(imageX, imageY, imageW, imageH);CGImageRef norCGImageRef= CGImageCreateWithImageInRect(norImage.CGImage, rect);// 将切割好的图片转换为uiimage设置为按钮的背景[btn setImage:[UIImage imageWithCGImage:norCGImageRef] forState:UIControlStateNormal];// 剪切选中状态图片CGImageRef selCGImageRef= CGImageCreateWithImageInRect(selImage.CGImage, rect);// 将切割好的图片转换为uiimage设置为按钮的背景[btn setImage:[UIImage imageWithCGImage:selCGImageRef] forState:UIControlStateSelected];// 添加按钮到中间轮盘图片上[self.centerWheel addSubview:btn];}}- (void)update:(UIButton *)btn{= NO;btn.selected = YES;self.selectButton = btn;}- (void)startRotating{!= nil) return;CADisplayLink *link = [CADisplayLink displayLinkWithTarget:self selector:@selector(centerImageRotation)];[link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];self.link = link;}- (void)centerImageRotation{= CGAffineTransformRotate(, M_PI_4/ 250);}- (void)stopRotating{// 关闭定时器[self.link invalidate];self.link = nil;}+ (instancetype)wheel{return [[[NSBundle mainBundle] loadNibNamed:@”NYWheel” owner:nil options:nil] lastObject];}- (IBAction)startBtnClick:(id)sender {= NO;CABasicAnimation *anima = [CABasicAnimation animation];anima.keyPath = @”transform.rotation”;anima.toValue = @(2 * M_PI * 3);anima.duration = 3.0;anima.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];anima.delegate = self;[addAnimation:anima forKey:nil];}- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{self.userInteractionEnabled = YES;}@endNYWheelButton
NYWheelButton.h
: UIButton@end每一个成功者都有一个开始。勇于开始，才能找到成功的路。
