@interface FirstViewController ()

@property (nonatomic,assign)BOOL isplay;

@end

@implementation FirstViewController

@synthesize isplay;

- (void)viewDidLoad

{

    [superviewDidLoad];

    isplay = NO;

    //圆角

    self.imgview.layer.cornerRadius =150.0 / 2.0;

    self.imgview.layer.masksToBounds =YES;

    //添加动画

    CABasicAnimation *monkeyAnimation = [CABasicAnimationanimationWithKeyPath:@"transform.rotation.z"];

    monkeyAnimation.toValue = [NSNumbernumberWithFloat:2.0 *M_PI];

monkeyAnimation.duration = 1.5f;

monkeyAnimation.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionLinear];

    monkeyAnimation.cumulative = NO;

    monkeyAnimation.removedOnCompletion = NO; //No Remove

    monkeyAnimation.repeatCount = FLT_MAX;

[self.imgview.layeraddAnimation:monkeyAnimation forKey:@"AnimatedKey"];

    [self.imgviewstopAnimating];

    // 加载动画但不播放动画

    self.imgview.layer.speed =0.2;

}

- (void)didReceiveMemoryWarning

{

    [superdidReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

//开始动画

- (IBAction)startAnimate:(id)sender {

    if (!isplay) {

        isplay = YES;

        self.imgview.layer.speed =1.0;

        self.imgview.layer.beginTime =0.0;

        CFTimeInterval pausedTime = [self.imgview.layertimeOffset];

        CFTimeInterval timeSincePause = [self.imgview.layerconvertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;

        self.imgview.layer.beginTime = timeSincePause;

    }

}

//停止动画并保存当前的角度

- (IBAction)stioAnimate:(id)sender {

    if (isplay) {

        isplay = NO;

        CFTimeInterval pausedTime = [self.imgview.layerconvertTime:CACurrentMediaTime() fromLayer:nil];

        self.imgview.layer.speed =0.0;

        self.imgview.layer.timeOffset = pausedTime;

    }

}

@end