iOS动画

  1. 锚点(参考 https://www.cnblogs.com/ybw123321/p/5394408.html)
    视图的平移、翻转都是以锚点为中心进行,所以希望达到向某个点
    实例可以参考:https://github.com/LynnCheng/DropdownMenu

  2. 基础动画:
    https://www.jianshu.com/p/71f2fa270b9c

  3. 核心动画
    https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/CoreAnimation_guide/Introduction/Introduction.html#//apple_ref/doc/uid/TP40004514

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