监听键盘弹起View上调

可以用三方库IQKeyboardManager 用这个第三方

http://www.jianshu.com/p/f8157895

#pragma mark - keyboard events -
 
///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 = (panelInputTextView.frame.origin.y+panelInputTextView.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);
    }];
}

//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 = (panelInputTextView.frame.origin.y+panelInputTextView.frame.size.height+INTERVAL_KEYBOARD) - (self.view.frame.size.height - kbHeight);