1.先添加對(duì)鍵盤的監(jiān)聽

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

當(dāng)系統(tǒng)消息出現(xiàn)UIKeyboardWillShowNotification和UIKeyboardWillHideNotification消息就會(huì)調(diào)用我們的keyboardWillShow和keyboardWillHide方法。

2.實(shí)現(xiàn)監(jiān)聽方法

#pragma mark ---- 根據(jù)鍵盤高度將當(dāng)前視圖向上滾動(dòng)同樣高度
///鍵盤顯示事件
- (void)keyboardWillShow:(NSNotification *)notification {
    //獲取鍵盤高度，在不同設(shè)備上，以及中英文下是不同的
    CGFloat kbHeight = [[notification.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height;
    
    //計(jì)算出鍵盤頂端到inputTextView panel底端的距離(加上自定義的緩沖距離INTERVAL_KEYBOARD)
    CGFloat offset = kbHeight;
    
    // 取得鍵盤的動(dòng)畫時(shí)間，這樣可以在視圖上移的時(shí)候更連貫
    double duration = [[notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    
    //將視圖上移計(jì)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);
        }];
    }
}

#pragma mark ---- 當(dāng)鍵盤消失后，視圖需要恢復(fù)原狀
///鍵盤消失事件
- (void)keyboardWillHide:(NSNotification *)notify {
    // 鍵盤動(dòng)畫時(shí)間
    double duration = [[notify.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    //視圖下沉恢復(fù)原狀
    [UIView animateWithDuration:duration animations:^{
        self.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
    }];
}

3.注銷通知

-(void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

4.然后在這里安利一個(gè)很好的第三方 IQKeyboardManager 特別好用
有需要的可以直接去下載 https://github.com/hackiftekhar/IQKeyboardManager