iphone - 'NSRangeException'，原因 : '* -[__NSArrayM objectAtIndex:]: index 2 beyond bounds [0 .. 1]'

Question

我正在尝试删除一些项目，但我收到了这个 NSException:

'NSRangeException'，原因:'* -[__NSArrayM objectAtIndex:]:索引 2 超出范围 [0 .. 1]'

这是我的代码:

-(void)deletePressed:(id)sender {

if (data.count > 0) {

    NSString *path = [NSHomeDirectory() stringByAppendingString:@"/Documents/Galeria/"];

    NSFileManager *manager = [NSFileManager defaultManager];

    for (NSIndexPath *indexPath in itensSelecionados) {

        NSString *result = [path stringByAppendingFormat:@"%@", [[manager contentsOfDirectoryAtPath:path error:nil] objectAtIndex:indexPath.row]];

        [manager removeItemAtPath:result error:nil];

    }

    [self viewWillAppear:YES];

}}

有人可以帮忙吗？

Answer 1

您不能从正在迭代的数组中删除对象。
可能没有适合您的解决方案。

一种是使用一个额外的可变数组来保存所有应该删除的对象，然后遍历它并从原始数组中删除对象:

-(void)deletePressed:(id)sender {
    if (data.count > 0) {
        NSString *path = [NSHomeDirectory() stringByAppendingString:@"/Documents/Galeria/"];
        NSFileManager *manager = [NSFileManager defaultManager];
        NSMutableArray *filesToDelete = [NSMutableArray array];

        // Build a list of files to delete
        for (NSIndexPath *indexPath in itensSelecionados) {
            NSString *result = [path stringByAppendingFormat:@"%@", [[manager contentsOfDirectoryAtPath:path error:nil] objectAtIndex:indexPath.row]];
            [filesToDelete addObject:result];
        }

        // Actually delete the files
        for (NSString *indexPathString in filesToDelete) {
            [manager removeItemAtPath:indexPathString error:nil];
        }

        // Why do you call viewWillAppear directly ??
        [self viewWillAppear:YES];
    }
}

编辑
根据 Thiago 的建议，在第二次迭代中将 NSIndexPath 修复为 NSString。