IOS 7 UITextField resignFirstResponder 坏

Question

当我在自定义单元格中使用 UItextField 时，以及当我 resignFirstResponder 文本字段时，我遇到了崩溃，但它不再可见(表格 View 滚出窗口)。我仍然可以找到文本字段，指针继续可访问，它不是空的，并且崩溃只发生在 IOS7 上，在 IOS6 上我没有这个问题。这是一些代码:

textField 是一个全局变量。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString * CellIdentifier = [NSString stringWithFormat:@"Cell%d",indexPath.row];

    TableCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
    {
        cell = [[TableCell alloc] init];

        if(indexPath.row == 0)
        {
            [textField setFrame:CGRectMake(15, 5, cell.frame.size.width-60, cell.frame.size.height)];
            textField.textAlignment = NSTextAlignmentLeft;
            [textField setBorderStyle:UITextBorderStyleNone];
            textField.textColor = [UIColor blackColor];
            textField.tag = indexPath.row;
            textField.delegate = self;
            textField.secureTextEntry = YES;
            [textField setFont:[UIFont fontWithName:@"Arial-BoldMT" size:15]];
            textField.textColor = [UIColor whiteColor];
            textField.returnKeyType = UIReturnKeyDone;
            [textField setAdjustsFontSizeToFitWidth:YES];
            textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
            textField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"Senha" attributes:@{NSForegroundColorAttributeName: [UIColor whiteColor]}];
            [cell.contentView textField];
        }
}
    return cell;
}

-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
//    NSLog(@"text field %@",textField);
//    NSLog(@"tfield return: %d",textField.isFirstResponder);
    [textField resignFirstResponder];
//    [self.view endEditing:YES];

    return NO;
}

Answer 1

在 Apple 的帮助下，我已经成功修复了一个类似的崩溃错误。关键是 reuseIdentifer。

引述来自 Apple 开发人员技术支持 的 Vincent Gable 的邮件:

This is a known behavior change that happens in iOS 7 with UITableView, when cells are not reused.

The fix here is to make sure that you follow proper cell reuse. If you do not want to re-use UITableViewCells, then it is recommended that you simply layout all your views inside a UIScrollView.

To make sure cells are re-used, make sure you are passing the same string to dequeueReusableCellWithIdentifier: that you pass to reuseIdentifier: when using alloc/init to make the cell. This string can not be nil.

所以我认为您应该确保您已将 TableCell 的 reuseIdentifer 属性设置为与您传递给 dequeueReusableCellWithIdentifier 的值相同: