Question

我有一些代码将所有目录从“/ Documents”复制到“Library / Caches /”。代码如下：

NSString *oldPath = [NSString stringWithFormat:@"%@/Documents/", NSHomeDirectory()];
NSString *newPath = [NSMutableString stringWithFormat:@"%@/Library/Caches/", NSHomeDirectory()];
NSError *error = nil;

// get the list of all files and directories

NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *fileList = [fileManager contentsOfDirectoryAtPath:oldPath error:&error];

if(error != nil)
{
    NSLog(@"\n\n\n1. There was an error in the file operation: %@", [error localizedDescription]);
    return;
}

for(NSString *file in fileList) 
{
    NSString *path = [oldPath stringByAppendingPathComponent:file];

    NSLog(@"The path for the file is: %@", path);

    BOOL isDir = NO;

    BOOL dirExists = [fileManager fileExistsAtPath:path isDirectory:(&isDir)];

    if(isDir && dirExists) 
    {
        //Move to the new location
        [fileManager copyItemAtPath:path toPath:[newPath stringByAppendingPathComponent:file] error:&error];
        if(error != nil)
        {
            NSLog(@"\n\n\n2. There was an error in the file operation: %@", [error localizedDescription]);
        }
        else
        {
            [fileManager removeItemAtPath:path error:&error];

            if(error != nil)
                NSLog(@"\n\n\n3. There was an error in the file operation: %@", [error localizedDescription]);
        }
    }
}

副本工作正常。我可以看到所有目录都被复制到新位置。

问题是空目录仍保留在Documents文件夹中。我在文档中阅读removeItemAtPath，并说它删除了目录的内容。是否删除了实际目录本身。

有人能告诉我代码中可能出现的问题吗？为什么空目录仍然存在？

编辑：

在第一次传递时，当目录存在于Documents中但不存在于Library / Caches中时，removeItemAtPath不会抛出错误。但是，空目录仍保留在Documents中。在上面的代码的第二遍，它试图删除空目录，removeItemAtPath抛出一个可可错误516，基本上没找到文件 - 这很奇怪，因为我仍然可以看到那些空目录。

另外，我在iPhone模拟器4.3.2和iPhone模拟器5.0上运行此代码，并在/ Users / Library / Application Support / iPhone模拟器中监控我的Mac上的目录结构/....

Answer 1

由于“/ Documents /”中的尾部“/”，可能会发生这种情况。尝试从前两行删除尾部“/”，或使用：

NSString *oldPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
NSString *newPath = [NSString pathWithComponents:[NSArray arrayWithObjects:NSHomeDirectory() , @"Library", @"Caches", nil]];

NSError *error = nil;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *fileList = [fileManager contentsOfDirectoryAtPath:oldPath error:&error];

if (error) {
    NSLog(@"\n\n\n1. There was an error in the file operation: %@", [error localizedDescription]);
    return;
}

for (NSString *file in fileList)  {
    NSString *path = [oldPath stringByAppendingPathComponent:file];
    NSLog(@"The path for the file is: %@", path);

    BOOL isDir = NO;

    if ([fileManager fileExistsAtPath:path isDirectory:&isDir] && isDir) {
        [fileManager copyItemAtPath:path toPath:[newPath stringByAppendingPathComponent:file] error:&error];
        if(error) {
            NSLog(@"\n\n\n2. There was an error in the file operation: %@", [error localizedDescription]);
        } else {
            [fileManager removeItemAtPath:path error:&error];

            if (error) {
                NSLog(@"\n\n\n3. There was an error in the file operation: %@", [error localizedDescription]);
            }
        }
    }
}

NSFileManager removeItemAtPath清除目录的内容，但不清除实际目录本身

1 个答案: