最近在做一個專案的時候，有這樣一個需求，點選UIButton彈出鍵盤，鍵盤的上方還需新增一個輸入框（UITextField/UITextView）,開始的想法是直接設定輸入框的

inputAccessoryView,設定後發現鍵盤根本就沒顯示出來.經過無數次的修改與查詢資料之後，終於大功告成。廢話不多說了，先上程式碼。

//建立輸入框檢視

- (void)createCommentsView {
    if (!commentsView) {
        
        commentsView = [[UIView alloc] initWithFrame:CGRectMake(0.0, SCREEN_HEIGHT - TAB_BAR_HEIGHT - 40.0, SCREEN_WIDTH, 40.0)];
        commentsView.backgroundColor = [UIColor whiteColor];
        
        commentText = [[UITextView alloc] initWithFrame:CGRectInset(commentsView.bounds, 5.0, 5.0)];
        commentText.layer.borderColor   = [COLORRGB(212.0, 212.0, 212.0) CGColor];
        commentText.layer.borderWidth   = 1.0;
        commentText.layer.cornerRadius  = 2.0;
        commentText.layer.masksToBounds = YES;
        
        commentText.inputAccessoryView  = commentsView;
        commentText.backgroundColor     = [UIColor clearColor];
        commentText.returnKeyType       = UIReturnKeySend;
        commentText.delegate            = self;
        commentText.font                = [UIFont systemFontOfSize:15.0];
        [commentsView addSubview:commentText];
    }
    [self.view.window addSubview:commentsView];//新增到window上或者其他檢視也行，只要在檢視以外就好了
    [commentText becomeFirstResponder];//讓textView成為第一響應者（第一次）這次鍵盤並未顯示出來，（個人覺得這裡主要是將commentsView設定為commentText的inputAccessoryView,然後再給一次焦點就能成功顯示）
}
 

- (void)showCommentText {
    [self createCommentsView];
    
    [commentText becomeFirstResponder];//再次讓textView成為第一響應者（第二次）這次鍵盤才成功顯示
}

//button的點選事件

- (void)handleClickComment:(UIButton *) sender {
    //這裡是為了防止連續點選
    sender.userInteractionEnabled = NO;
    [sender performSelector:@selector(setUserInteractionEnabled:) withObject:@YES afterDelay:1];
    [self showCommentText];
}