CAKeyframeAnimation 关键动画实现
第一种：通过设置不同的属性值来进行关键帧控制，
第二种：通过绘制路径进行(好听又独特的微信名字有哪些？1、生夏2、月亮像一个梦3、路过的风4、往秋5、进一寸的欢喜6、忽然而已7、日月既往8、北菊9、山花如翡)关键帧控制,

（本文gif效果图感觉有延迟问题，实际可自行敲出来看看）

   CALayer *layer = [[CALayer alloc] init];    layer.bounds            = CGRectMake(0, 0, 20, 20);    layer.backgroundColor   = [UIColor blueColor].CGColor;    layer.position          = CGPointMake(10, 10);    [self.view.layer addSublayer:layer];    CAKeyframeAnimation *KeyframeAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];    NSValue *val1 = [NSValue valueWithCGPoint:CGPointMake((self.view.bounds.size.width-10)/2, 50)];    NSValue *val2 = [NSValue valueWithCGPoint:CGPointMake(10, 200)];    NSValue *val3 = [NSValue valueWithCGPoint:CGPointMake(self.view.bounds.size.width-10, 300)];    NSValue *val4 = [NSValue valueWithCGPoint:CGPointMake(10, 500)];    NSValue *val5 = [NSValue valueWithCGPoint:CGPointMake((self.view.bounds.size.width-20)/2, 700)];    NSArray *values = @[val1,val2,val3,val4,val5];    KeyframeAnimation.values = values;    KeyframeAnimation.duration = 10.0;    KeyframeAnimation.removedOnCompletion = NO;    KeyframeAnimation.fillMode = kCAFillModeForwards;    KeyframeAnimation.repeatCount = HUGE_VAL;    [layer addAnimation:KeyframeAnimation forKey:@"keyAnimation"];

效果如下：图片

RPReplay_Final1645604097.gif补充一些关键帧的特有属性:

keyTimes:各个关键帧的时间控制
比如 values 有四个关键帧, duration间隔为 6
那么每两个关键帧之间的时间间隔是: 6/(4-1),
如果我现在想让他们的时间间隔,这时候就需要用到 keyTimes,例如我设置如下：
animation.keyTimes = @[@0,@0.3,@0.8,@1];
第一帧到第二帧需要的时间到达总时间的 0.3,
第二帧到第三帧时,需要到达总时间的 0.8,
第三帧到最后一帧需要到达总时间 1,

[注意:到达很重要,意思就是占总时间的百分比]caculationMode

动画常见的模式类型有：
kCAAnimationLinear 连续的,默认就是这种
kCAAnimationDiscrete 离散式,会直接跳转过去
kCAAnimationPaced 匀速执行,会忽略keyTimes
kCAAnimationCubic 平滑执行,运动轨迹更加平滑
kCAAnimationCubicPaced 平滑匀速执行

在上面代码中把caculationMode属性设置后看看效果：

    keyAnimation.calculationMode = kCAAnimationCubic;

效果如下：

现在我们看看第二种写法：

    CALayer *layer          = [[CALayer alloc] init];    layer.bounds            = CGRectMake(0, 0, 20, 20);    layer.backgroundColor   = [UIColor blueColor].CGColor;    layer.position          = CGPointMake(5, 5);    [self.view.layer addSublayer:layer];    CAKeyframeAnimation *KeyframeAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];    UIBezierPath *bezier    = [UIBezierPath bezierPathWithRect:CGRectMake(50, 100, 300, 300)];    KeyframeAnimation.path       = bezier.CGPath;    KeyframeAnimation.duration   = 6.0;    KeyframeAnimation.removedOnCompletion    = NO;    KeyframeAnimation.fillMode               = kCAFillModeForwards;    KeyframeAnimation.calculationMode        = kCAAnimationCubicPaced;    [layer addAnimation:KeyframeAnimation forKey:@"KeyframeAnimation"];

效果如下：RPReplay_Final1645604288.gif缩放效果

UIView * view = [[UIView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];    view.backgroundColor = UIColor.blueColor;    [self.view addSubview:view];    //    CAKeyframeAnimation* animation = [CAKeyframeAnimation animationWithKeyPath:@"transform"];//整体变化    CAKeyframeAnimation* animation = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale.x"];//宽变化//    CAKeyframeAnimation* animation = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale.y"];//高变化    animation.duration  = 0.6;// 动画时间    NSMutableArray *values = [NSMutableArray array];    // 前两个是控制view的大小的；[缩小效果]//    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.0, 1.0, 1.0)]];//    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.8, 0.8, 1.0)]];//    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.0, 1.0, 1.0)]];        // 前两个是控制view的大小的；[放大效果]    [values addObject:[NSValue valueWithCATran