心跳动画

gistfile1.txt

/**心跳动画*/
- (void)heartAnimationWithLayer:(CALayer*)layer {
    CAAnimationGroup *group = [[CAAnimationGroup alloc]init];
    group.duration = 0.5;
    group.repeatCount = HUGE;
    CABasicAnimation *scaleAnim = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    scaleAnim.toValue = @1.2;
    CABasicAnimation *alphaAnim = [CABasicAnimation animationWithKeyPath:@"opacity"];
    alphaAnim.toValue = @0.3f;
    group.animations = @[scaleAnim,alphaAnim];
    [layer addAnimation:group forKey:nil];
}