@interface FirstViewController ()

@property (nonatomic,assign)BOOL isplay;

@end

@implementation FirstViewController

@synthesize isplay;

- (void)viewDidLoad

{

[super viewDidLoad];

isplay = NO;

//圆角

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

self.imgview.layer.masksToBounds = YES;

//加入动画

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

monkeyAnimation.toValue = [NSNumber numberWithFloat:2.0 *M_PI];

monkeyAnimation.duration = 1.5f;

monkeyAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];

monkeyAnimation.cumulative = NO;

monkeyAnimation.removedOnCompletion = NO; //No Remove

monkeyAnimation.repeatCount = FLT_MAX;

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

[self.imgview stopAnimating];

// 载入动画 但不播放动画

self.imgview.layer.speed = 0.2;

}

- (void)didReceiveMemoryWarning

{

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

//開始动画

- (IBAction)startAnimate:(id)sender {

if (!isplay) {

isplay = YES;

self.imgview.layer.speed = 1.0;

self.imgview.layer.beginTime = 0.0;

CFTimeInterval pausedTime = [self.imgview.layer timeOffset];

CFTimeInterval timeSincePause = [self.imgview.layer convertTime: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.layer convertTime:CACurrentMediaTime() fromLayer:nil];

self.imgview.layer.speed = 0.0;

self.imgview.layer.timeOffset = pausedTime;

}

}

@end