- (void)viewDidLoad {

    [super viewDidLoad];

    _imageView = [[UIImageView alloc] initWithFrame:CGRectMake(90, 90, 90, 90)];

    _imageView.image= [UIImageimageNamed:@"joy.jpg"];

    [self.view  addSubview:_imageView];

}

- (void)touchesBegan:(NSSet *)toucheswithEvent:(UIEvent*)event{

    CGPointpoint = [[touchesanyObject]locationInView:self.view];

  CAKeyframeAnimation*animation1 =  [selfgetAniamtion1];

  CAKeyframeAnimation*animation2 =  [selfgetAnimation2:point];

    CAAnimationGroup *animationGroup = [CAAnimationGroup animation];

    animationGroup.animations=@[animation1,animation2];

    animationGroup.duration=3;

    animationGroup.repeatCount=MAXFLOAT;

    //加速方式: 匀速:kCAMediaTimingFunctionLinear

    animationGroup.timingFunction = [CAMediaTimingFunction  functionWithName:  kCAMediaTimingFunctionLinear];

    [_imageView.layer  addAnimation:animationGroupforKey:nil];

}

//获取抖动动画

-(CAKeyframeAnimation *)getAniamtion1{

    CAKeyframeAnimation *keyFrameAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.z"];

    keyFrameAnimation.duration=3;

    keyFrameAnimation.repeatCount=MAXFLOAT;

//    keyFrameAnimation.autoreverses = YES;

    CGFloat  angle  =  M_PI*2;

//    keyFrameAnimation.values = @[@(angle),@(-angle) ];

 keyFrameAnimation.values=@[@(angle),@0];

    [_imageView.layer  addAnimation:keyFrameAnimationforKey:nil];

    return  keyFrameAnimation;

}

-(CAKeyframeAnimation *)getAnimation2:(CGPoint )point{

    CAKeyframeAnimation *keyFrameAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];

    CGMutablePathRef path = CGPathCreateMutable();

    CGFloatw = point.x-_imageView.center.x;

    CGFloath = point.y-_imageView.center.y;

    CGRect  rect =CGRectMake(_imageView.center.x,_imageView.center.y, w, h);

    CGPathAddRect(path,NULL, rect);

    keyFrameAnimation.path= path;

    keyFrameAnimation.duration=3;

    returnkeyFrameAnimation;

}