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並前往https://blog.csdn.net/baidu_40537062/article/details/109772380

ios(swift) UIButton setTitle不生效_baidu_40537062的博客

doneBtn.setTitle("22", for: .normal)其实生效了，只是默认字体颜色是白色，可能背景也是白色，所以看不出来用下面的代码设置无效：doneBtn.

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