ios - 尝试删除 NSUserdefault 数组中的 TableView 行

Question

我正在尝试删除 TableView 中的一行，然后将更新的 TableView 保存到 NSUserdefault 中的数组。它看起来像这样:

 - (void)tableView:(UITableView *)tableView 

 commitEditingStyle:(UITableViewCellEditingStyle)editingStyle

  forRowAtIndexPath:(NSIndexPath *)indexPath {


NSMutableArray *stringsArray = [[NSUserDefaults standardUserDefaults] objectForKey:@"history"];
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSMutableArray *history = [NSMutableArray arrayWithArray:[prefs objectForKey:@"history"]];    
 NSUInteger row = [indexPath row];

 NSUInteger count = [stringsArray count];


 if (row < count) {



    [stringsArray removeObjectAtIndex:row];


  [prefs setObject:history forKey:@"history"];
    [[NSUserDefaults standardUserDefaults] synchronize];
    [tableView reloadData]; 

    NSLog(@"tabort %d", row);
    NSLog(@"tabort %d", count);    
    NSLog(@"tabort %@", stringsArray);

    }

    }

当我运行它时，我可以删除一行，但它不会被保存，当我尝试删除下一行时，它会崩溃并显示以下消息:

2012-04-15 11:02:58.704 test220[88546:f803] * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[__NSCFArray removeObjectAtIndex:]: mutating method sent to immutable object'

我做错了什么？

Answer 1

尝试更改行:

NSMutableArray *stringsArray = [[NSUserDefaults standardUserDefaults] objectForKey:@"history"];

到:

NSMutableArray *stringsArray = [NSMutableArray arrayWithArray: [[NSUserDefaults standardUserDefaults] arrayForKey:@"history"]];