iOS - 呼吸动画库
先看效果
需求和实现思路
具体要求
- 内部头像呼吸放大缩小 无限循环
- 每次放大同时需要背景还有一张图也放大 并且透明
- 点击缩放整个背景视图
实现思路
首先 需要使用创建一个Layer 装第一个无限放大缩小的呼吸的图 背景也需要一个Layer 做 放大+透明度渐变的动画组并且也放置一张需要放大渐变的图片
最后点击触发. 添加一个一次性的缩放动画即可
呼吸动画layer和动画
呼吸layer
CALayer *layer = [CALayer layer];
layer.position = CGPointMake(kHeartSizeWidth/2.0f, kHeartSizeHeight/2.0f);
layer.bounds = CGRectMake(0, 0, kHeartSizeWidth/2.0f, kHeartSizeHeight/2.0f);
layer.backgroundColor = [UIColor clearColor].CGColor;
layer.contents = (__bridge id _Nullable)([UIImage imageNamed:@"breathImage"].CGImage);
layer.contentsGravity = kCAGravityResizeAspect;
[self.heartView.layer addSublayer:layer];
复制代码kHeartSizeHeight 和kHeartSizeWidth 是常量 demo中写好了100
加帧动画
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale"];
animation.values = @[@1.f, @1.4f, @1.f];
animation.keyTimes = @[@0.f, @0.5f, @1.f];
animation.duration = 1; //1000ms
animation.repeatCount = FLT_MAX;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
[animation setValue:kBreathAnimationKey forKey:kBreathAnimationName];
[layer addAnimation:animation forKey:kBreathAnimationKey];
复制代码差值器也可以自定义 例如:
[CAMediaTimingFunction functionWithControlPoints:0.33 :0 :0.67 :1]
复制代码这里我做的持续时常1秒
放大渐变动画group
创建新layer
CALayer *breathLayer = [CALayer layer];
breathLayer.position = layer.position;
breathLayer.bounds = layer.bounds;
breathLayer.backgroundColor = [UIColor clearColor].CGColor;
breathLayer.contents = (__bridge id _Nullable)([UIImage imageNamed:@"breathImage"].CGImage);
breathLayer.contentsGravity = kCAGravityResizeAspect;
[self.heartView.layer insertSublayer:breathLayer below:layer];
//[self.heartView.layer addSublayer:breathLayer];
复制代码这里用的是放在 呼吸layer后边 如果想放在呼吸layer前边 就把里面注释打开 然后注掉 inert那行代码
动画组 包含 放大 渐变
//缩放
CAKeyframeAnimation *scaleAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale"];
scaleAnimation.values = @[@1.f, @2.4f];
scaleAnimation.keyTimes = @[@0.f,@1.f];
scaleAnimation.duration = animation.duration;
scaleAnimation.repeatCount = FLT_MAX;
scaleAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
//透明度
CAKeyframeAnimation *opacityAnimation = [CAKeyframeAnimation animation];
opacityAnimation.keyPath = @"opacity";
opacityAnimation.values = @[@1.f, @0.f];
opacityAnimation.duration = 0.4f;
opacityAnimation.keyTimes = @[@0.f, @1.f];
opacityAnimation.repeatCount = FLT_MAX;
opacityAnimation.duration = animation.duration;
opacityAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
//动画组
CAAnimationGroup *scaleOpacityGroup = [CAAnimationGroup animation];
scaleOpacityGroup.animations = @[scaleAnimation, opacityAnimation];
scaleOpacityGroup.removedOnCompletion = NO;
scaleOpacityGroup.fillMode = kCAFillModeForwards;
scaleOpacityGroup.duration = animation.duration;
scaleOpacityGroup.repeatCount = FLT_MAX;
[breathLayer addAnimation:scaleOpacityGroup forKey:kBreathScaleName];
复制代码点击缩放动画
跟第一个一样 只不过 执行次数默认一次 执行完就可以了
- (void)shakeAnimation {
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale"];
animation.values = @[@1.0f, @0.8f, @1.f];
animation.keyTimes = @[@0.f,@0.5f, @1.f];
animation.duration = 0.35f;
animation.timingFunctions = @[[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
[self.heartView.layer addAnimation:animation forKey:@""];
}
复制代码手势触发的时候 调用一下
