Ios 在ScrollTabletoBottom中发布

我正在用ios开发一个聊天应用程序，我有自定义的tableview和UIView，底部有GrowingTextview和按钮。我想在按下Send按钮时将Tableview移到底部。但它无法正确地滚动到底部

我的代码

    -(void) textViewDidChange:(UITextView *)textView
    {

        CGFloat maxHeight = [JSMessageInputView maxHeight];
        CGSize size = [textView sizeThatFits:CGSizeMake(textView.frame.size.width, maxHeight)];
        CGFloat textViewContentHeight = size.height;

        // End of textView.contentSize replacement code

        BOOL isShrinking = textViewContentHeight < self.previousTextViewContentHeight;
        CGFloat changeInHeight = textViewContentHeight - self.previousTextViewContentHeight;

        if(!isShrinking && self.previousTextViewContentHeight == maxHeight) {
            changeInHeight = 0;
        }
        else {
            changeInHeight = MIN(changeInHeight, maxHeight - self.previousTextViewContentHeight);
        }

        if(changeInHeight != 0.0f) {
            //        if(!isShrinking)
            //            [self.inputToolBarView adjustTextViewHeightBy:changeInHeight];

            [UIView animateWithDuration:0.25f
                             animations:^{
                                 UIEdgeInsets insets = UIEdgeInsetsMake(0.0f,
                                                                        0.0f,
                                                                        self.ChatTableView.contentInset.bottom + changeInHeight,
                                                                        0.0f);

                                 self.ChatTableView.contentInset = insets;
                                 self.ChatTableView.scrollIndicatorInsets = insets;
                                 [self scrollToBottomAnimated:NO];

                                 if(isShrinking) {
                                     // if shrinking the view, animate text view frame BEFORE input view frame
                                     [self.inputToolBarView adjustTextViewHeightBy:changeInHeight];
                                 }

                                 CGRect inputViewFrame = self.inputToolBarView.frame;
                                 self.inputToolBarView.frame = CGRectMake(0.0f,
                                                                          inputViewFrame.origin.y - changeInHeight,
                                                                          inputViewFrame.size.width,
                                                                          inputViewFrame.size.height + changeInHeight);

                                 if(!isShrinking) {
                                     [self.inputToolBarView adjustTextViewHeightBy:changeInHeight];
                                 }
                             }
                             completion:^(BOOL finished) {
                             }];


            self.previousTextViewContentHeight = MIN(textViewContentHeight, maxHeight);
        }


        self.inputToolBarView.sendButton.enabled = ([textView.text trimWhitespace].length > 0);

        }
    -(void)textViewDidBeginEditing:(UITextView *)textView
    {

        if(!self.previousTextViewContentHeight)
            self.previousTextViewContentHeight = textView.contentSize.height;

        [self scrollToBottomAnimated:YES];



    }

    - (void)scrollToBottomAnimated:(BOOL)animated
    {
        NSInteger rows = [self.ChatTableView
                          numberOfRowsInSection:0];

        if(rows > 0) {
            [self.ChatTableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:rows - 1 inSection:0]
                                  atScrollPosition:UITableViewScrollPositionBottom
                                          animated:animated];
        }
    }
    - (void)keyboardWillShowHide:(NSNotification *)notification
    {
        CGRect keyboardRect = [[notification.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
        UIViewAnimationCurve curve = [[notification.userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] integerValue];
        double duration = [[notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

        [UIView animateWithDuration:duration
                              delay:0.0f
                            options:[UIView animationOptionsForCurve:curve]
                         animations:^{
                             CGFloat keyboardY = [self.view convertRect:keyboardRect fromView:nil].origin.y;

                             CGRect inputViewFrame = self.inputToolBarView.frame;
                             CGFloat inputViewFrameY = keyboardY - inputViewFrame.size.height;

                             // for ipad modal form presentations
                             CGFloat messageViewFrameBottom = self.view.frame.size.height - INPUT_HEIGHT;
                             if(inputViewFrameY > messageViewFrameBottom)
                                 inputViewFrameY = messageViewFrameBottom;

                             self.inputToolBarView.frame = CGRectMake(inputViewFrame.origin.x,
                                                                      inputViewFrameY,
                                                                      inputViewFrame.size.width,
                                                                      inputViewFrame.size.height);

                             UIEdgeInsets insets = self.originalTableViewContentInset;
                             insets.bottom = self.view.frame.size.height - self.inputToolBarView.frame.origin.y - inputViewFrame.size.height;

                             self.ChatTableView.contentInset = insets;
                             self.ChatTableView.scrollIndicatorInsets = insets;
                         }
                         completion:^(BOOL finished) {
                         }];

    }
-(void)sendPressed:(id)sender {
    NSString*TextString;
    TextString=_inputToolBarView.textView.text;


    NSString *rawString = [self.inputToolBarView.textView text];
    NSCharacterSet *whitespace = [NSCharacterSet whitespaceAndNewlineCharacterSet];
    NSString *trimmed = [rawString stringByTrimmingCharactersInSet:whitespace];
    _inputToolBarView.textView.text = trimmed;

    if ([TextString isEqualToString:@""]) {
        NSLog(@"Empty");
    }
    else
    {
        if([sharedClass.unmatchcheckStr isEqualToString:@"unMatched"])
        {
            UIAlertController * alert=   [UIAlertController
                                          alertControllerWithTitle:[NSString stringWithFormat:@"%@ Unmatched you",_userName]
                                          message:[NSString stringWithFormat:@"%@",UNMATCH_CHAT_ALERT]
                                          preferredStyle:UIAlertControllerStyleAlert];

            UIAlertAction* okButton = [UIAlertAction
                                       actionWithTitle:@"Ok"
                                       style:UIAlertActionStyleDefault
                                       handler:^(UIAlertAction * action)
                                       {
                                           sharedClass.unmatchcheckStr=@"";
                                           [[ChatConnectClass sharedManager]deleteUserRecord:[NSString stringWithFormat:@"%@",_toUserID]];
                                           [self performSegueWithIdentifier:@"match" sender:self];
                                       }];
            [alert addAction:okButton];
            [self presentViewController:alert animated:YES completion:nil];

        }
        else
        {
            NSDate *currentDateNSDate = [NSDate date];
            NSDateFormatter *dateFormatterCurrent = [[NSDateFormatter alloc] init];
            [dateFormatterCurrent setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
            NSString *time = [dateFormatterCurrent stringFromDate:currentDateNSDate];
            NSDate *currentDate = [dateFormatterCurrent dateFromString:time];

            int random = arc4random() % 10000;
            NSString *messageId = [NSString stringWithFormat:@"%@%lu%d",[[MontageUserDefaults getBasicInfo] valueForKey:kMemberId],(unsigned long)([[NSDate date] timeIntervalSince1970]*10.0),random];
            NSLog(@"MSG id Sent : %@",messageId);
            [[ChatConnectClass sharedManager]insertNewMessages:[NSString stringWithFormat:@"%@",_toUserID] message:_inputToolBarView.textView.text messageId:messageId date:currentDate isFrom:NO msgStatus:@"Sending"];
            [[ChatConnectClass sharedManager] sendMessage:_inputToolBarView.textView.text  messageId:messageId  To:self.toUserID];
            array_recieveMessage.array = [[ChatConnectClass sharedManager] fetchMessagesUsingUserid:[NSString stringWithFormat:@"%@",_toUserID]];
           [self.ChatTableView reloadData];
           [self scrollToBottomAnimated:YES];
           _inputToolBarView.textView.text=@"";

        }
    }
}

-（无效）textViewDidChange:（UITextView*）textView
{
CGFloat maxHeight=[JSMessageInputView maxHeight]；
CGSize size=[textView sizeThatFits:CGSizeMake（textView.frame.size.width，maxHeight）]；
CGFloat textViewContentHeight=size.height；
//textView.contentSize替换代码结束
BOOL isShrinking=textViewContentHeight0）；
}
-（无效）textViewDidBeginEditing:（UITextView*）textView
{
如果（！self.previousTextViewContentHeight）
self.previousTextViewContentHeight=textView.contentSize.height；
[自滚动至底部动画：是]；
}
-（void）滚动到底部动画化：（BOOL）动画化
{
NSInteger行=[self.ChatTableView
节中的行数：0]；
如果（行数>0）{
[self.ChatTableView ScrollToRowatineXpath:[NSIndexPath indexPathForRow:rows-1第1节：0]
atScrollPosition:UITableViewScrollPositionBottom
动画：动画]；
}
}
-（无效）键盘将显示隐藏：（NSNotification*）通知
{
CGRect keyboardRect=[[notification.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey]CGRectValue]；
UIViewAnimationCurve=[[notification.userInfo objectForKey:UIKeyboardAnimationCurveUserInfo]integerValue]；
double duration=[[notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey]doubleValue]；
[UIView animateWithDuration:持续时间
延迟：0.0f
选项：[UIView AnimationOptions for curve:curve]
动画：^{
CGFloat keyboardY=[self.view convertRect:keyboardRect fromView:nil].origin.y；
CGRect inputViewFrame=self.inputToolBarView.frame；
CGFloat inputViewFrameY=键盘Y-inputViewFrame.size.height；
//用于ipad模态形式演示
CGFloat messageViewFrameBottom=self.view.frame.size.height-输入\单位高度；
如果（inputViewFrameY>messageViewFrameBottom）
inputViewFrameY=messageViewFrameBottom；
self.inputToolBarView.frame=CGRectMake（inputViewFrame.origin.x，
inputViewFrameY，
inputViewFrame.size.width，
inputViewFrame.size.height）；
UIEdgeInsets insets=self.originalTableViewContentInset；
insets.bottom=self.view.frame.size.height-self.inputToolBarView.frame.origin.y-inputViewFrame.size.height；
self.ChatTableView.contentInset=插入；
self.ChatTableView.ScrollIndicationSets=插入；
}
完成：^（布尔完成）{
}];
}
-