学步园

目中经常遇到键盘出现后，页面上移的问题，所以一并整理在此处，供大家参考。
 
1. 键盘重要的两个系统通知：
UIKeyboardWillShowNotification  -> 键盘将要出现时触发，调出中文候选框也会触发
UIKeyboardWillHideNotification    -> 键盘将要消失时触发
 
2. 键盘高度值：
 
iPhone (Portrait)
216
252 (带中文候选框)
 
iPhone (Landscape)
162
198 (带中文候选框)
 
iPhone中文候选框大小均为36
 
iPad (Portrait)
264
318 (带中文候选框)
 
 
iPad(Landscape)
352
406 (带中文候选框)
 
iPad中文候选框大小均为54
 
3. 实战
 
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[[NSNotificationCenter defaultCenter] addObserverForName:UIKeyboardWillShowNotification
                                                  object:nil
                                                   queue:[NSOperationQueue mainQueue]
                                              usingBlock: ^(NSNotification *note)
 {
     CGRect keyboardFrame;
     [note.userInfo[UIKeyboardFrameEndUserInfoKey] getValue:&keyboardFrame];
     float keyboardHeight = CGRectGetHeight(keyboardFrame);
                 
     NSLog(@"键盘将升起");
     NSLog(@"键盘高度:%f",keyboardHeight);
 
     // 页面调整
                 
 }];