objective-c - 尝试从 UITableView 中删除单元格时出错

Question

当我尝试从我的 UITableView 中删除一个单元格时它给了我这个错误:

*** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/UIKit-1912.3/UITableView.m:1046
2012-08-02 16:35:13.941 jsontest2[1551:f803] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (4) must be equal to the number of rows contained in that section before the update (4), plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).'
*** First throw call stack:
(0x13e0052 0x1571d0a 0x1388a78 0x9c02db 0xbb518 0xc6211 0xc623f 0x2ce9 0xd289d 0x226d70 0x13e1ec9 0x3a5c2 0x3a55a 0xdfb76 0xe003f 0xdf2fe 0x5fa30 0x5fc56 0x46384 0x39aa9 0x12cafa9 0x13b41c5 0x1319022 0x131790a 0x1316db4 0x1316ccb 0x12c9879 0x12c993e 0x37a9b 0x1c22 0x1b95)
terminate called throwing an exception**

这是我的代码:

- (void)tableView:(UITableView *)tableView
commitEditingStyle:(UITableViewCellEditingStyle)editingStyle 
forRowAtIndexPath:(NSIndexPath *)indexPath 
{
    [tabela beginUpdates]; 
    if (editingStyle == UITableViewCellEditingStyleDelete) 
    {
        // Get the TAG and ID of Bill to delete
        //UITableViewCell * cell = [self tableView:tabela cellForRowAtIndexPath:indexPath];
        //NSLog(@"%d", cell.tag);

        [tabela deleteRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath, nil] withRowAnimation:YES];      

    }   

    [tabela endUpdates];
    [tabela reloadData];

}

感谢您的帮助!

编辑

self.billsArray = [[NSMutableArray alloc] init];<br/>
self.billsArray = [resultsDictionary objectForKey:@"bills"];

Answer 1

在您的 billsArray 中，确保并删除要删除的相应对象。

[billsArray removeObjectAtIndex:indexPath.row];

这是输出的提示:

The number of rows contained in an existing section after the update (4) must be equal to the number of rows contained in that section before the update (4), plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 deleted) and plus or minus the number of rows moved into or out of that section

所以你的 UITableView 几乎是在说:

"Ok, I have 20 rows (which comes from [billsArray count]. Now I'm suppose to delete one row which means I should have 19 rows total....But my delegate is saying I should have 20 rows...Whhhattt dooo I dooo??? .....crash " - UITableView

因此，无论何时删除行，都要确保并从数据数组中删除该对象。 OR 如果您添加一行，请确保并将其添加到您的数据数组中。

编辑:(响应 OP 编辑​​)。

这是你的问题。

self.billsArray = [resultsDictionary objectForKey:@"bills"]; 

这将创建一个只读数组。

你需要做的是:

self.billsArray = [[NSMutableArray alloc] initWithArray:[resultsDictionary objectForKey:@"bills"]];

或者

self.billsArray = [NSMutableArray arrayWithArray:[resultsDictionary objectForKey:@"bills"]];

或者你可以这样做(不是一个干净的方法):

NSMutableArray *temp = [resultsDictionary objectForKey:@"bills"];
self.billsArray = [temp mutableCopy];