ios处理键盘的大小

1. iOS的键盘有几个通知

   UIKeyboardWillShowNotification
   UIKeyboardDidShowNotification
   UIKeyboardWillHideNotification
   UIKeyboardDidHideNotification
   

2. 每一个通知的具体内容是什么呢

   UIKeyboardAnimationCurveUserInfoKey = 7;
   UIKeyboardAnimationDurationUserInfoKey = "0.25";
   UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {375, 258}}";
   UIKeyboardCenterBeginUserInfoKey = "NSPoint: {187.5, 796}";
   UIKeyboardCenterEndUserInfoKey = "NSPoint: {187.5, 538}";
   UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 667}, {375, 258}}";
   UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 409}, {375, 258}}";
   UIKeyboardIsLocalUserInfoKey = 1;
   

3. 键盘大小的转换
   通知里的大小是屏幕坐标系中的大小和位置，没有考虑旋转。因此需要一次转化。

       let rect = self.view.convertRect(keyboardrect!, fromView: nil)
   

4. 为啥不能假设键盘有一个固定的大小

   • 不同输入法的键盘大小可能不同 iOS9 的中文输入法比英文的大那么一点点
   • 不同版本的键盘大小也不同
   • 屏幕旋转时，屏幕的大小也不同

转载于:https://www.cnblogs.com/huahuahu/p/ios-chu-li-jian-pan-de-da-xiao.html