IOS 7 UITextField resignFirstResponder BAD [英] IOS 7 UITextField resignFirstResponder BAD

问题描述

我在使用UItextField时遇到崩溃，在我的customCell中，当我resignFirstResponder文本字段时，但它不再可见（表格视图滚出窗口）。我仍然可以找到文本字段，指针继续可访问，它不是空，并且崩溃只发生在IOS7上，在IOS6上我没有这个问题。下面是一些代码：

Im getting a crash, when using a UItextField, inside my customCell, and when i resignFirstResponder the textfield, but its not visible anymore(the table view scrolled out of window). I still can find the textfield, the pointer continues accessible, it is no null, and the crash only occurs on IOS7, on IOS6 i dont have this problem. Heres some code :

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;
}

推荐答案

我已经成功修复了在Apple的帮助下类似的崩溃bug。关键是 reuseIdentifer 。

I've successfully fixed a similar crash bug with the help of Apple. The key is the reuseIdentifer.

报价来自 Vincent Gable 的邮件 Apple开发人员技术支持：

这是iOS 7中已知的行为更改 UITableView ，当不重复使用单元格时。

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

此处的修复是为了确保您遵循正确的单元格重用。如果您不想重新使用 UITableViewCells ，那么建议您只需在 UIScrollView 。

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.

要确保重复使用单元格，请确保将相同的字符串传递给 dequeueReusableCellWithIdentifier：你使用 alloc / init 来传递给 reuseIdentifier：来制作单元格。这个字符串不能为零。

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.

所以我认为你应该确保你已经设置了 TableCell 的 reuseIdentifer 属性，其值已传递给 dequeueReusableCellWithIdentifier：

So I think you should make sure you've set TableCell's reuseIdentifer property with the same value you've passed to dequeueReusableCellWithIdentifier:

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