情景1
界面.png
代码.png
输入框输入内容且键盘退出时，点击按钮textColor执行无效。
解决办法：self.textField.text = self.textField.text
参考
https://stackoverflow.com/questions/46750614/uitextfield-textcolor-updates-in-ios10-not-in-ios-11
https://stackoverflow.com/questions/46178078/ios-11-public-beta-9-uitextfield-textcolor-cant-be-changed-when-no-keyboard
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