微专业GeekBand-IOS开发高级进阶笔记-第二周

CATransaction

+ begin

config current transaction

CATransaction setValue: forKey

    kCATransactionAnimationDuration;
    kCATransactionDisableActions;
    kCATransactionAnimationTimingFunction;
    kCATransactionCompletionBlock;

+ commit

[Can nest]
[Only outmost commit begins animating]

Core Animation 默认是打开的

隐式动画

CAAction - Protocol

- All CAAction adopted it
- implement runActionForKey:object:arguments: method

当默认的隐式动画不能满足时，[CATransaction setDisableActions:Yes]

显示动画

CAAnimation - CAAction, CAMediaTiming

一般使用子类

    - CAPropertyAnimation 
        - CABasicAnimation, CAKeyframeAnimation
    - CAAnimationGroup
    -CATransition

有一个delegate

CABasicAnimation

-animationWithKeyPath:(KVC) animatableProperty

config animation

fromValue: 默认为当前值
toValue
byValue
duration
repeatCount (如果想要不停地重复就可以将它设置为 HUGE_VALF）

[在完成之后需要手动设置成目标值(toValue)不然会跳回到原本的值]

CAKeyframeAnimation

它有一个path属性

创建path

 _path = CGPathCreateMutable();
CGPathMoveToPoint(_path, NULL, x, y);
CGPathAddArc(_path, Null, x, y, r, 0, M_PI, YES);
CGPathCloseSubPath(_path);

还有一个 timingFunction 的属性
可以设置 = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunction…]

calculationMode 添加差值的不同方法
keyTimes (only for non-paced)

Group Animation: 一个包含 Animation 的 NSArray
group.duration —> 如果时间更长，全部中断
layer - addAnimation:group:forKey:

Timing

每一个layer都是分开计算时间的，所以需要 time converting （好像单位换算）
-convertTime:fromLayer:
-convertTime:toLayer:
nil layer means system time

layer.speed = 0 to pause