由于未捕获的异常“NSGenericException”而终止应用程序，原因：“*** Collection <CALayerArray: 0x66522e0> 在枚举时发生了突变

Question

有时我的应用程序会因为显示 * Collection was mutated while being enumerated 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视图控制器行时崩溃。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。 "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", “” )'

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视图控制器的同时对界面执行所有这些操作。尝试将pushViewController 行包装在dispatch_after 块中，延迟例如0.1 秒，以使接口的其他更改有时间稳定下来。或者换一种方式：将removeFromSuperview 的东西延迟。更好的是，抛出某种标志，以便稍后在viewWillAppear 上删除要从超级视图中删除的内容。你现在不需要这样做；无论如何，您将要隐藏以使用推送的视图控制器覆盖此视图。