我目前正在研究 inline UIDate picker 的实现在 UITableViewCell 内部。

当我选择应插入该单元格的正上方的单元格时，我能够显示和隐藏该选择器单元格，这是我期望的行为。但是，如果我在表格 View 中选择任何其他单元格，应用程序会崩溃:

*** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/UIKit-3318.16.14/UITableView.m:1582

看了accepted answer to this SO question之后，我添加了一个异常断点，我发现应用程序在 didSelectRowAtIndexPath 中调用 [tableView endUpdates]; 时崩溃:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [self.tableView deselectRowAtIndexPath:indexPath animated:YES];

    // Check to see if the "Only Alert From" row was selected. The cell with the picker should be below this one.
    if (indexPath.section == TimeOfDaySection && indexPath.row == HourTimeZoneRow  && self.timePickerIsShowing == NO){

        [tableView beginUpdates];
        [self showTimePicker];
        [tableView endUpdates];

    } else{
        [tableView beginUpdates];
        [self hideTimePicker];
        [tableView endUpdates];
        [self.tableView deselectRowAtIndexPath:indexPath animated:YES];
    }
    [self.tableView deselectRowAtIndexPath:indexPath animated:YES];
}

也就是说，我不确定如何进行。 If I comment out the call to [tableView endUpdates];, the app won't crash when other cells are selected, BUT the cell with the picker view won't hide.有没有人有什么建议？谢谢!

编辑:下面是我的 showTimePicker 和 hideTimePicker 代码:

- (void)showTimePicker
{
    self.timePickerIsShowing = YES;
    self.timePicker.hidden = NO;

    //Create the index path where we insert the cell with the picker
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:HourTimeZoneRow + 1 inSection:TimeOfDaySection];

    [self.tableView beginUpdates];
    [self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
    [self.tableView endUpdates];

    self.timePicker.alpha = 0.0f;
    [UIView animateWithDuration:0.25 animations:^{
        self.timePicker.alpha = 1.0f;
        //This is the row where the picker cell should be inserted
        [self.tableView reloadRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:HourTimeZoneRow + 1 inSection:TimeOfDaySection]] withRowAnimation:UITableViewRowAnimationFade];
        [self.tableView reloadData];
    }];
}

- (void)hideTimePicker {
    self.timePickerIsShowing = NO;
    self.timePicker.hidden = YES;

    //Create the index path where we delete the cell with the picker
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:HourTimeZoneRow + 1 inSection:TimeOfDaySection];
    [self.tableView beginUpdates];
    //Delete the picker row
    [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
    [self.tableView endUpdates];
    [UIView animateWithDuration:0.25
                     animations:^{
                         self.timePicker.alpha = 0.0f;
                     }
                     completion:^(BOOL finished){
                         self.timePicker.hidden = YES;
                     }];
}

编辑 2:阅读后 this SO thread ，我相信问题可能出在我的 numberOfRowsInSection 方法上:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    switch (section) {
        case NotificationsSection:
            return TotalPreferencesRows;
            break;
        case RedZoneSection:
            return TotalRedZoneRows;
            break;
        case TimeOfDaySection:
            if (self.timePickerIsShowing) {
                return TotalTimeOfDayRows + 1;
            }
//            else if (self.timePickerIsShowing == NO){
//                return TotalTimeOfDayRows;
//            }
            else{
                return TotalTimeOfDayRows;
            }
            return TotalTimeOfDayRows;
            break;
        default:
            return 0;
            break;
    }
}

最佳答案

不确定这是否是崩溃的根源，但不建议您多次调用 beginUpdates
[tableView beginUpdates]; [自显示时间选择器]; [tableView 结束更新]; 因为 showTimePicker 调用 [self.tableView beginUpdates];

关于ios - 应用程序在调用 'tableView endUpdates' 时崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28545306/