I know from what I have observed, and from what people are saying on the www, that the keyboard takes close to 0.3 seconds to appear on the iPhone. I have set my 'field-moving-out-of-the-way' animations to 0.3s, and they work well.I know from what I have observed, and from what
阅读背景：
键盘在iOS上制作动画所需的时间
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