OC textField鍵盤彈起事件

經常用到點擊textFiled時彈起鍵盤，然后 textField工具條也要隨之上升，自己做了個簡單的例子

1. 監聽鍵盤彈起收回事件

    //監聽鍵盤彈出事件
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    //監聽鍵盤隱藏事件
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

2. 實現對應方法

獲取鍵盤的高度時一定要用** objectForKey:UIKeyboardFrameEndUserInfoKey**，切記

#pragma mark - 鍵盤即將彈出事件處理
- (void)keyboardWillShow:(NSNotification *)notification
{
    //獲取鍵盤信息
    NSDictionary *keyBoardInfo = [notification userInfo];
    
    //獲取動畫時間
    CGFloat duration = [[keyBoardInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
    
    //獲取鍵盤的frame信息
    NSValue *value = [keyBoardInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGSize keyboardSize = [value CGRectValue].size;
    
    
    [UIView animateWithDuration:duration animations:^{
        CGRect frame = _chatBar.frame;
        frame.origin.y = SCREENHEIGHT - keyboardSize.height - frame.size.height;
        _chatBar.frame = frame;
    } completion:nil];
}

#pragma mark - 鍵盤即將隱藏事件
- (void)keyboardWillHide:(NSNotification *)notification
{
    
    //獲取鍵盤信息
    NSDictionary *keyBoardInfo = [notification userInfo];
    
    //獲取動畫時間
    CGFloat duration = [[keyBoardInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
    
    //獲取鍵盤的frame信息
    
    [UIView animateWithDuration:duration animations:^{
        CGRect frame = _chatBar.frame;
        frame.origin.y = SCREENHEIGHT - _chatBar.height;
        _chatBar.frame = frame;
    } completion:nil];
}