[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil]; - (void)keyboardWillShow:(NSNotification *)notification{  // 鍵盤顯示/隱藏完畢的frame  CGRect frame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];  // 動畫時間  CGFloat duration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];     // 動畫  [UIView animateWithDuration:duration animations:^{    commentView.minY = -frame.size.height;  }];}

  //聲明的全局變量：  UIButton *commentView;  UIView *commentWhiteColorView;  UITextField *commentTextField;  UIButton *emojiAndKeyboardButton; - (void)initCommentToolbarView{  commentView = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, kScreenWidth, kScreenHeight + 230)];  commentView.hidden = YES;  [commentView addTarget:self action:@selector(commentViewAction) forControlEvents:UIControlEventTouchUpInside];  [self.view addSubview:commentView];     commentWhiteColorView = [UIView viewWithFrame:CGRectMake(0, kScreenHeight - 50, kScreenWidth, 50) backgroundColor:[UIColor whiteColor]];  commentWhiteColorView.backgroundColor = [UIColor whiteColor];  [commentView addSubview:commentWhiteColorView];     UIView *lightGrayLineView = [UIView viewWithFrame:CGRectMake(0, 0, kScreenWidth, 1) backgroundColor:RGB(240, 240, 240)];  [commentWhiteColorView addSubview:lightGrayLineView];     //文本輸入框  commentTextField = [[UITextField alloc]initWithFrame:CGRectMake(10, 5, kScreenWidth - (10 + 42 + 60), 40)];  commentTextField.font = FONT(14);  commentTextField.leftView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 10, 40)];  commentTextField.leftViewMode = UITextFieldViewModeAlways;  commentTextField.backgroundColor = RGB(234, 234, 234);  commentTextField.placeholder = @"評論";  [commentWhiteColorView addSubview:commentTextField];     //表情和鍵盤切換按鈕  emojiAndKeyboardButton = [UIButton buttonWithType:UIButtonTypeCustom];  emojiAndKeyboardButton.frame = CGRectMake(commentTextField.maxX + 7, 0, 35, 50);  [emojiAndKeyboardButton setImage:[UIImage imageNamed:@"icon_emoji_input"] forState:UIControlStateNormal];  [emojiAndKeyboardButton setImage:[UIImage imageNamed:@"icon_keyboard_input"] forState:UIControlStateSelected];  [emojiAndKeyboardButton addTarget:self action:@selector(emojiAndKeyboardButtonAction:) forControlEvents:UIControlEventTouchUpInside];  [commentWhiteColorView addSubview:emojiAndKeyboardButton];     //發送按鈕  UIButton *sendButton = [UIButton buttonWithFrame:CGRectMake(emojiAndKeyboardButton.maxX, commentTextField.minY, 50, 40) type:UIButtonTypeCustom title:@"發送" titleColor:RGB(135, 135, 135) imageName:nil action:@selector(sendButtonAction) target:self];  sendButton.titleLabel.font = FONT(14);  [sendButton setBorder:1 color:RGB(135, 135, 135)];  [sendButton setCornerRadius:3];  [commentWhiteColorView addSubview:sendButton];     //表情滾動視圖  emojiScrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, commentWhiteColorView.maxY, kScreenWidth, 200)];  emojiScrollView.backgroundColor = RGB(244, 244, 246);  emojiScrollView.delegate = self;  emojiScrollView.pagingEnabled = YES;  [commentView addSubview:emojiScrollView];     //從文件里獲取到的表情字符串數組  emojiArray = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle]pathForResource:@"Emoji" ofType:@"plist"]];     CGFloat emojiButtonWidth = kScreenWidth/8;     int i = 0;  //頁數向上取整  int page = ceilf(emojiArray.count/32.0);     //UIKit里的頁面控制器  pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, emojiScrollView.maxY, kScreenWidth, 30)];  pageControl.numberOfPages = page;  pageControl.backgroundColor = RGB(244, 244, 246);  pageControl.pageIndicatorTintColor = RGB(206, 206, 206);  pageControl.currentPageIndicatorTintColor = RGB(121, 121, 121);  [commentView addSubview:pageControl];     //設置表情滾動視圖的contentSize  emojiScrollView.contentSize = CGSizeMake(kScreenWidth * page, 200);  //循環創建表情按鈕  for (int currentPage = 0; currentPage < page; currentPage++) {    for (int row = 0; row < 4; row++) {      for (int column = 0; column < 8; column++) {        UIButton *emojiButton = [UIButton buttonWithType:UIButtonTypeCustom];        if (row == 3 && column == 7) {          //如果是第4行第8列就設置刪除表情的圖片替代字符串，并調用另一個方法          [emojiButton setImage:[UIImage imageNamed:@"back_icon_input"] forState:UIControlStateNormal];          [emojiButton addTarget:self action:@selector(deleteEmojiAction) forControlEvents:UIControlEventTouchUpInside];        }else{          [emojiButton setTitle:emojiArray[i++] forState:UIControlStateNormal];          [emojiButton addTarget:self action:@selector(emojiButtonAction:) forControlEvents:UIControlEventTouchUpInside];        }        emojiButton.frame = CGRectMake(emojiButtonWidth * column + currentPage * kScreenWidth, 50 * row, emojiButtonWidth, 50);        [emojiScrollView addSubview:emojiButton];                 //當i等于數組計數時就打斷循環        if (i == emojiArray.count) {          break;        }      }    }  }     //手動添加最后一個刪除表情按鈕  UIButton *emojiButton = [UIButton buttonWithType:UIButtonTypeCustom];  [emojiButton setImage:[UIImage imageNamed:@"back_icon_input"] forState:UIControlStateNormal];  emojiButton.frame = CGRectMake(emojiButtonWidth * 7 + 5 * kScreenWidth, 50 * 3, emojiButtonWidth, 50);  [emojiButton addTarget:self action:@selector(deleteEmojiAction) forControlEvents:UIControlEventTouchUpInside];  [emojiScrollView addSubview:emojiButton];} //表情按鈕事件- (void)emojiButtonAction:(UIButton *)sender{//  NSLog(@"%@",sender.currentTitle);  NSMutableString *oldText = [NSMutableString stringWithString:commentTextField.text];  [oldText appendString:sender.currentTitle];  commentTextField.text = oldText;} //刪除表情按鈕事件- (void)deleteEmojiAction{  if (commentTextField.text.length > 1) {    //判斷是否是表情，表情length為2，所以減去2    if ([emojiArray containsObject:[commentTextField.text substringWithRange:NSMakeRange(commentTextField.text.length - 2, 2)]]) {      commentTextField.text = [commentTextField.text substringToIndex:commentTextField.text.length - 2];    }else{      commentTextField.text = [commentTextField.text substringToIndex:commentTextField.text.length - 1];    }  }else{    commentTextField.text = @"";  }} //在代理方法中調整pageControl- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{  if (scrollView == emojiScrollView) {    pageControl.currentPage = scrollView.contentOffset.x/scrollView.width;  }} //表情和鍵盤切換按鈕事件- (void)emojiAndKeyboardButtonAction:(UIButton *)sender{  sender.selected = !sender.selected;     if (sender.selected == YES) {    [commentTextField resignFirstResponder];         [UIView animateWithDuration:0.5 animations:^{      commentView.minY = -230;    }];  }else{    [commentTextField becomeFirstResponder];  }} - (void)commentViewAction{  [commentTextField resignFirstResponder];     commentView.hidden = YES;  commentView.minY = 0;  commentTextField.text = @"";  emojiAndKeyboardButton.selected = NO;}