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

问题描述

我正在尝试删除一些项目，但是我收到此NSException:

I'm trying to delete some items but i'm receiving this NSException:

"NSRangeException"，原因:" * -[__ NSArrayM objectAtIndex:]:索引2超出范围[0 .. 1]"

'NSRangeException', reason: '* -[__NSArrayM objectAtIndex:]: index 2 beyond bounds [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?

推荐答案

您无法从要迭代的数组中删除对象.
可能没有适合您的解决方案.

You can't remove objects from an array that you are iterating through.
There may be few solutions for you.

一种方法是使用另一个可变数组，该数组将保存所有应删除的对象，然后对其进行迭代并从原始数组中删除这些对象:

One is to use an additional mutable array that will hold all the objects that should be deleted and then iterate through it and remove the objects from the original array:

-(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
由于Thiago的建议，在第二次迭代中将 NSIndexPath 修复为 NSString .

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