copyItemAtPath 总是失败并出现文件存在错误

Question

我尝试使用 copyItemAtPath 复制目录，但每次都会失败并出现“操作无法完成。文件存在”错误。

这是我正在使用的代码

NSLog(@"Copying from: %@ to: %@", [[NSUserDefaults standardUserDefaults] objectForKey:@"template_1_path"], path);
if(![file_manager copyItemAtPath:[NSString stringWithFormat:@"%@", [[NSUserDefaults standardUserDefaults] objectForKey:@"template_1_path"]] toPath:[NSString stringWithFormat:@"%@", path] error:&error]) {
      NSLog(@"%@" [error localizedDescription]);
}

日志示例 -

"Copying from: /Users/testuser/Sites/example_site to: /Users/testuser/Desktop"
"The operation couldn’t be completed. File exists"

关于我做错了什么有什么想法吗？

提前致谢！

Answer 1

您似乎正在尝试将文件“/Users/testuser/Sites/example_site”复制到文件“/Users/testuser/Desktop/example_site”，假设您只需指定目标目录并且它将使用源文件名。这是行不通的。引用文档：

复制文件时，目标路径必须以文件名结尾 - 不会隐式采用源文件名。

Answer 2

您正在尝试复制具有相同文件名的内容。尝试这样的事情：

- (BOOL)copyFolderAtPath:(NSString *)sourceFolder toDestinationFolderAtPath:(NSString*)destinationFolder {
    //including root folder.
    //Just remove it if you just want to copy the contents of the source folder.
    destinationFolder = [destinationFolder stringByAppendingPathComponent:[sourceFolder lastPathComponent]];

    NSFileManager * fileManager = [ NSFileManager defaultManager];
    NSError * error = nil;
    //check if destinationFolder exists
    if ([ fileManager fileExistsAtPath:destinationFolder])
    {
        //removing destination, so soucer may be copied
        if (![fileManager removeItemAtPath:destinationFolder error:&error])
        {
            NSLog(@"Could not remove old files. Error:%@",error);
            [error release];
            return NO;
        }
    }
    error = nil;
    //copying destination
    if ( !( [ fileManager copyItemAtPath:sourceFolder toPath:destinationFolder error:&error ]) )
    {
        NSLog(@"Could not copy report at path %@ to path %@. error %@",sourceFolder, destinationFolder, error);
        [error release];
        return NO;
    }
    return YES;
}