IOS 点击按钮 光环 冲击波效果

UIBezierPath * path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(0, 0) radius:ROUND_WIDTH/2 -3 startAngle:0 endAngle:2*M_PI clockwise:YES];

    

    CAShapeLayer * layer = [CAShapeLayer layer];

    layer.path = path.CGPath;

    layer.fillColor = [[UIColor clearColor]CGColor];

    layer.strokeColor = [[UIColor orangeColor] CGColor];

    layer.lineCap = kCALineCapRound;

    layer.position = pt;

    layer.lineWidth = 1.5f;

    

    

    CABasicAnimation *scaleAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];

    scaleAnimation.fromValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];

    scaleAnimation.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(5, 5, 1)];

    scaleAnimation.removedOnCompletion = NO;

    scaleAnimation.fillMode = kCAFillModeForwards;

    

    CABasicAnimation *alphaAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];

    alphaAnimation.fromValue = @1;

    alphaAnimation.toValue = @0;

    alphaAnimation.removedOnCompletion = NO;

    alphaAnimation.fillMode = kCAFillModeForwards;

    

    CAAnimationGroup * group = [CAAnimationGroup animation];

    group.animations = @[scaleAnimation, alphaAnimation];

    group.duration = 1.5;

    group.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];

    group.delegate = self;

    group.removedOnCompletion = NO;

    group.fillMode = kCAFillModeForwards;

    

    [_bgImgView.layer addSublayer:layer];

    

    [layer addAnimation:group forKey:@""];

    layer = nil;

 

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