这两天遇到一个问题，通过 storyboard 创建的 static cell，通过代码设置 cell 上 label 文字的时候，发现文字经常不能正常显示，只有通过滑动 tableview 之后，重新刷新了以后才能正常显示。
解决办法：
If you are setting the text to nil somewhere when you try to set it to a non-nil value the actual view that contains the text will be missing. This was introduced in iOS8. Try setting to an empty space @” “ character instead.
This was my issue but it happens when you set it to “” and nil. So you actually have to set it to “ “. So basically isEmpty causes this behavior as well.
就是在 storyboard 创建的 cell 中给 label 设置个初始值:“ ”，空格就行了，解决了我遇到的问题。
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