iOS9的多任务对于iPad来说有三种功能：Slide Over、Split View、Picture in Picture。
苹果玩文字游戏不是一天两天的了。
给老机型用户泼一盆冷水。直接上图：
按照苹果的解释：
- li>Slide Over provides a user-invoked overlay view on the right side of the screen (or on the left side in a right-to-left language version of iOS) that lets a user pick a secondary app to view and interact with.
- Split View displays two side-by-side apps on iPad, letting the user view, resize, and interact with both of them.
- Picture in Picture lets a user play video in a moveable, resizable window that floats over the apps onscreen.
换句话说：
- Slide Over 是伪多任务：等于“暂停”当前程序然后侧栏打开另一程序；
- Split View 是真多任务：同时运行两个程序。但仅支持iPad Air 2（及后续机型）
- Picture in Picture：画中画，三星用户、以及越狱安装了VideoPane的用户应该已经很熟悉了。
现在知道为啥iPad Air2为啥要有2G内存了吧？
参考资料：
官网文档
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