1.先設(shè)置監(jiān)聽(tīng)者以及監(jiān)聽(tīng)對(duì)象和事件

<pre>
<code class='objectivec hljs'>
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

2.實(shí)現(xiàn)監(jiān)聽(tīng)方法

• (void)keyboardWillShow:(NSNotification *)notification {
  NSDictionary *userInfo = [notification userInfo];
  // 獲取鍵盤(pán)的frame
  CGRect keyboardFrame = [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
  // 獲取鍵盤(pán)的動(dòng)畫(huà)時(shí)間
  NSTimeInterval animationDuration = [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
  // do something
  }

• (void)keyboardWillHide:(NSNotification *)notification {
  // do something
  }
  </code></pre>