图标左右摇摆动画

- (void)viewDidLoad {

[superviewDidLoad];

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

_momImageView= [[UIImageViewalloc]initWithFrame:CGRectMake(0,0,50,50)];

_momImageView.center=self.view.center;

_momImageView.image= [UIImageimageNamed:@"icon_exercise"];

[self.viewaddSubview:_momImageView];

[selfstartAnimation];

}

-(void)startAnimation{

//开始动画

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

momAnimation.fromValue= [NSNumbernumberWithFloat:-0.3];

momAnimation.toValue= [NSNumbernumberWithFloat:0.3];

momAnimation.duration=0.5;

momAnimation.repeatCount=CGFLOAT_MAX;

momAnimation.autoreverses=YES;

momAnimation.delegate=self;

[_momImageView.layeraddAnimation:momAnimationforKey:@"animateLayer"];

}

//暂停动画，图片未复位

-(void)pauseLayer:(CALayer*)layer

{

CFTimeIntervalpausedTime = [layerconvertTime:CACurrentMediaTime()fromLayer:nil];

layer.speed=0.0;

layer.timeOffset= pausedTime;

}

//重新开始动画

-(void)resumeLayer:(CALayer*)layer{

CFTimeIntervalpausedTime = [layertimeOffset];

layer.speed=1.0;

layer.timeOffset=0.0;

layer.beginTime=0.0;

CFTimeIntervaltimeSincePause = [layerconvertTime:CACurrentMediaTime()fromLayer:nil] - pausedTime;

layer.beginTime= timeSincePause;

}