从表格视图单元格更新文本并刷新后键盘关闭

Posted 2023-03-04

【中文标题】从表格视图单元格更新文本并刷新后键盘关闭

【英文标题】：keyboard dismissing after updating text from tableview cell and refreshing

【发布时间】：2015-11-10 11:25:41

【问题描述】：

嗨，我在 customtableviewcell 中有一个 UILABEL 和 UITEXTFIELD。我需要在每个字符更改时更新 UILABEL。当我更新文本字段键盘中的每个字符时，我什至尝试使用通知中心。任何快速帮助将不胜感激

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    NSString *rateValue=[textField.text stringByReplacingCharactersInRange:range withString:string];

    NSCharacterSet *notAllowedChars = [[NSCharacterSet characterSetWithCharactersInString:@"1234567890"] invertedSet];

    NSString *resultString = [[rateValue componentsSeparatedByCharactersInSet:notAllowedChars] componentsJoinedByString:@""];

    [arrayRates replaceObjectAtIndex:textField.tag withObject:resultString];
    selectedTextField=textField;
    selectedTxtFieldPath = [NSIndexPath indexPathForRow:textField.tag inSection:0];
    [self.tableViewSkuVoids beginUpdates];
    [self.tableViewSkuVoids reloadRowsAtIndexPaths:@[selectedTxtFieldPath] withRowAnimation:UITableViewRowAnimationFade];
    [self.tableViewSkuVoids endUpdates];
    [[self.tableViewSkuVoids superview]  endEditing:NO];

   [[NSNotificationCenter defaultCenter] postNotificationName:@"keyboardWillShow" object:nil userInfo:nil];

   [selectedTextField becomeFirstResponder];
   return YES;

【问题讨论】：

[selectedTextField becomeFirstResponder];每次调用此方法时都会调用键盘您可以从其他地方调用这行代码吗，例如 -(void)textFieldDidBeginEditing:(UITextField *)textField

为什么要重新加载单元格？开始编辑时获取对标签的引用，然后直接更新。

Avi.. 已经得到标签的实例，它工作正常，，，但是单个字符被读取两次

【参考方案1】：

当你用

重新加载单元格时

[self.tableViewSkuVoids reloadRowsAtIndexPaths:@[selectedTxtFieldPath] withRowAnimation:UITableViewRowAnimationFade];

它将为您的文本字段提供resignFirstResponder，并关闭键盘

唯一的解决方案是手动调整单元格高度和表格内容高度https://***.com/a/33621733/1060785

【参考方案2】：

这对我来说很好

 - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

        NSString *rateValue=[textField.text stringByReplacingCharactersInRange:range withString:string];

        NSCharacterSet *notAllowedChars = [[NSCharacterSet characterSetWithCharactersInString:@"1234567890"] invertedSet];

        NSString *resultString = [[rateValue componentsSeparatedByCharactersInSet:notAllowedChars] componentsJoinedByString:@""];

        [arrayRates replaceObjectAtIndex:textField.tag withObject:resultString];

        selectedTextField=textField;

        selectedIndexPath = [NSIndexPath indexPathForRow:textField.tag inSection:0];

        customCell *cell=(customCell *)[self.tableView cellForRowAtIndexPath: selectedIndexPath];

        NSString *multiplierValue=someValue;

        if ([resultString isEqualToString:@"0.0"])
            cell.txtFieldRates.text=@"";
        else
            cell.txtFieldRates.text=[NSString stringWithFormat:@"$ %@",resultString];

        NSString *customerValue=[NSString stringWithFormat:@"%d",[multiplierValue intValue]*[resultString intValue]*365];

        if (customerValue.intValue<=0)
            cell.lblCustomer.text=@"";
        else
            cell.lblCustomer.text=[NSString stringWithFormat:@"$ %@", customerValue];


           return NO;