iphone - 由于未捕获的异常 'NSGenericException' 终止应用程序，原因 : '*** Collection was mutated while being enumerated

Question

有时我的应用程序因显示 * Collection 在被枚举时发生了变异而崩溃。这一直发生在同一行代码中。请帮助我解决这个问题。我坚持这一点。该应用程序在推送我的代码的 View Controller 行时崩溃。但这并不常见。我的错误控制台

由于未捕获的异常“NSGenericException”而终止应用程序，原因:“* Collection CALayerArray: 0x1030c730 在枚举时发生了突变。
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我的代码:

 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
 ServiceDetails *service=[[ServiceDetails  alloc] initWithNibName:@"ServiceDetails"   bundle:nil];  
    CompanyListingForm *list=[[CompanyListingForm  alloc]initWithNibName:@"CompanyListingForm" bundle:nil];
[category_company_text resignFirstResponder];
if(viewHoldingTable)
{
    [viewHoldingTable removeFromSuperview];
}
if (category_clicked_flag==0) {
    if (location_or_cat_com==0) {
        NSMutableArray *get=[district_array objectAtIndex:indexPath.row];
        locationid=[[get objectAtIndex:0]intValue];
        [location_textfield resignFirstResponder];
        location_textfield.text=[get objectAtIndex:1];
    }
    else
    {
        if (draggingView) {
            [draggingView removeFromSuperview];

        }
        if (viewHoldingTable) {
            [viewHoldingTable removeFromSuperview];
        }


        NSMutableArray *get=[company_array objectAtIndex:indexPath.row];
        category_company_text.text=[get objectAtIndex:1];



        service.ida=[NSString stringWithFormat:@"%d",[[get objectAtIndex:0] intValue]];

        service.idloc=[NSString stringWithFormat:@"%d",locationid];



        [self.navigationController pushViewController:service animated:YES];//getting error at this point.

        //[emer release];   
    }
}
else
{
    if (location_or_cat_com==0) {
        NSMutableArray *get=[district_array objectAtIndex:indexPath.row];
        locationid=[[get objectAtIndex:0]intValue];
        [location_textfield resignFirstResponder];
        location_textfield.text=[get objectAtIndex:1];
    }
    else
    {
        NSMutableArray *get=[category_array objectAtIndex:indexPath.row];
        category_company_text.text=[get objectAtIndex:1];
        int catid=[[get objectAtIndex:0]intValue];

        list.IDForLoc=[NSString stringWithFormat:@"%d",locationid];
        list.IDForCat=[NSString stringWithFormat:@"%d",catid];
        list.companydetails=[get objectAtIndex:1];
        [self.navigationController pushViewController:list animated:YES];//getting error at this point.

    } 
}
 [service release];
 [list release];
}

Answer 1

我认为问题在于您在要求推送 View Controller 的同时对界面执行所有这些操作。尝试包装 pushViewController dispatch_after 中的一行 block ，例如延迟 0.1 秒，以使接口(interface)的其他更改有时间稳定下来。或者换一种方式:把 removeFromSuperview东西变成延迟。更好的是，抛出某种标志，以便稍后在 viewWillAppear 上删除要从 super View 中删除的内容。 .您现在不需要这样做；无论如何，您将要隐藏以使用推送的 View Controller 覆盖此 View 。