@interface ViewController ()
{
CALayer *_layer;
CAAnimationGroup *_animaTionGroup;
CADisplayLink *_disPlayLink;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)startAnimation
{
CALayer *layer = [[CALayer alloc] init];
layer.cornerRadius = [UIScreen mainScreen].bounds.size.width/2;
layer.frame = CGRectMake(0, 0, layer.cornerRadius * 2, layer.cornerRadius * 2);
layer.position = self.view.layer.position;
UIColor *color = [UIColor colorWithRed:arc4random()%10*0.1 green:arc4random()%10*0.1 blue:arc4random()%10*0.1 alpha:1];
layer.backgroundColor = color.CGColor;
[self.view.layer addSublayer:layer];
CAMediaTimingFunction *defaultCurve = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault];
_animaTionGroup = [CAAnimationGroup animation];
_animaTionGroup.delegate = self;
_animaTionGroup.duration = 2;
_animaTionGroup.removedOnCompletion = YES;
_animaTionGroup.timingFunction = defaultCurve;
CABasicAnimation *scaleAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale.xy"];
scaleAnimation.fromValue = @0.0;
scaleAnimation.toValue = @1.0;
scaleAnimation.duration = 2;
CAKeyframeAnimation *opencityAnimation = [CAKeyframeAnimation animationWithKeyPath:@"opacity"];
opencityAnimation.duration = 2;
opencityAnimation.values = @[@0.8,@0.4,@0.0];
opencityAnimation.keyTimes = @[@0,@0.5,@1];
opencityAnimation.removedOnCompletion = YES;
NSArray *animations = @[scaleAnimation,opencityAnimation];
_animaTionGroup.animations = animations;
[layer addAnimation:_animaTionGroup forKey:nil];
[self performSelector:@selector(removeLayer:) withObject:layer afterDelay:1.5];
}
- (void)removeLayer:(CALayer *)layer
{
[layer removeFromSuperlayer];
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
_disPlayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(delayAnimation)];
_disPlayLink.frameInterval = 40;
[_disPlayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
}
- (void)delayAnimation
{
[self startAnimation];
}
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
[self.view.layer removeAllAnimations];
[_disPlayLink invalidate];
_disPlayLink = nil;
}