iOS-当输入框被键盘遮挡时让整个view上移

• • 注册键盘通知

  #pragma mark - 键盘通知
  - (void)addNoticeForKeyboard {
  
      //注册键盘出现的通知
      [[NSNotificationCenter defaultCenter] addObserver:self
                                               selector:@selector(keyboardWillShow:)
                                                   name:UIKeyboardWillShowNotification object:nil];
      //注册键盘消失的通知
      [[NSNotificationCenter defaultCenter] addObserver:self
                                               selector:@selector(keyboardWillHide:)
                                                   name:UIKeyboardWillHideNotification object:nil];
  }

  • 键盘代理事件

  ///键盘显示事件
  - (void) keyboardWillShow:(NSNotification *)notification {
      //获取键盘高度，在不同设备上，以及中英文下是不同的
      CGFloat kbHeight = [[notification.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height;
  
      //计算出键盘顶端到inputTextView panel底端的距离(加上自定义的缓冲距离INTERVAL_KEYBOARD)
      CGFloat offset = (textView.frame.origin.y+textView.frame.size.height+INTERVAL_KEYBOARD) - (self.view.frame.size.height - kbHeight);
  
      // 取得键盘的动画时间，这样可以在视图上移的时候更连贯
      double duration = [[notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
  
      //将视图上移计算好的偏移
      if(offset > 0) {
          [UIView animateWithDuration:duration animations:^{
              self.view.frame = CGRectMake(0.0f, -offset, self.view.frame.size.width, self.view.frame.size.height);
          }];
      }
  }
  
  ///键盘消失事件
  - (void) keyboardWillHide:(NSNotification *)notify {
      // 键盘动画时间
      double duration = [[notify.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
  
      //视图下沉恢复原状
      [UIView animateWithDuration:duration animations:^{
          self.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
      }];
  }

  
  
  作者：奋斗的蜗牛
  链接：http://www.jianshu.com/p/4e235e952b0c
  來源：简书