为什么alertView弹出后button会消失的问题

按option后会有提示：Do not use the label object to set the text color or the shadow color. Instead, use the setTitleColor:forState: and setTitleShadowColor:forState: methods of this class to make those changes.

设置button的字体颜色要用 setTitleColor:forState:

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原文地址：https://www.cnblogs.com/ejllen/p/3752426.html