0x00
在设置一个视图A的frame时，忘记设置它的高度了
然后又通过视图A的frame来生成视图B的frame
导致视图B的frame出现了无穷大∞
po _msgView.frame
(origin = (x = 59.5, y = 92), size = (width = 194.5, height = 0))
_msgLabel.frame = CGRectInset(_msgView.frame, 15, 10);
po _msgLabel.frame
(origin = (x = +Inf, y = +Inf), size = (width = 0, height = 0))
直接导致崩溃!!!
一个有趣的Button
https://github.com/xjh093/JHLikeButton
