iPhone/iPad:无法将文件夹从NSBundle复制到NSDocumentDirectory

Question

我想在我的NSBundle中复制一个包含大量图像的文件夹.
我尝试使用这些代码.

    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory,
                                                         NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *documentDBFolderPath = [documentsDirectory stringByAppendingPathComponent:@"Images"];

    NSString *resourceDBFolderPath = [[[NSBundle mainBundle] resourcePath]
                                          stringByAppendingPathComponent:@"Images"];
        [fileManager copyItemAtPath:resourceDBFolderPath toPath:documentDBFolderPath error:&error];

让我们说在名为Test.png的文件夹中有一个图像,我想在我的按钮上显示图像,它不起作用!
但是,如果我只将NSBundle中的单个图像复制到NSDocumentDirectory,它就可以了!

例:

更改

stringByAppendingPathComponent:@"Images"  

至

stringByAppendingPathComponent:@"Test.png"

所以问题在于将文件夹复制到NSDocumentDirectory!
我的代码是否错误？
或者是不可能复制文件夹？(这意味着我必须单独复制文件)

Answer 1

下面的代码将在文档目录下创建一个名为"images"的文件夹,并将捆绑包中名为"folderinbundle"的文件夹中的所有文件复制到"images"

- (void) copyImages
{
    NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *sourcePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"folderinbundle"];  //folder contain images in your bundle
    NSString *destPath = [documentsDirectory stringByAppendingPathComponent:@"images"];  //images is your folder under document directory

    NSError *error;
    [[NSFileManager defaultManager] copyItemAtPath:sourcePath toPath:destPath error:&error];  //copy every files from sourcePath to destPath
}

编辑以澄清:如果"folderinbundle"是物理文件夹而不是组,则上述操作将起作用.

Answer 2

奥斯卡是正确的,目前没有办法用一个命令复制整个文件夹.

像这样的方法可能会起作用(预警 - 我的办公室连接已关闭,我无法访问我的Mac以验证此代码是否正常工作.一旦我能够验证这一点).只需使用[self copyDirectory:@"Images"]进行调用,它将处理其余部分.

-(void) copyDirectory:(NSString *)directory {
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *documentDBFolderPath = [documentsDirectory stringByAppendingPathComponent:directory];
    NSString *resourceDBFolderPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:directory];

    if (![fileManager fileExistsAtPath:documentDBFolderPath]) {
        //Create Directory!
        [fileManager createDirectoryAtPath:documentDBFolderPath withIntermediateDirectories:NO attributes:nil error:&error];
    } else {
        NSLog(@"Directory exists! %@", documentDBFolderPath);
    }

    NSArray *fileList = [fileManager contentsOfDirectoryAtPath:resourceDBFolderPath error:&error];
    for (NSString *s in fileList) {
        NSString *newFilePath = [documentDBFolderPath stringByAppendingPathComponent:s];
        NSString *oldFilePath = [resourceDBFolderPath stringByAppendingPathComponent:s];
        if (![fileManager fileExistsAtPath:newFilePath]) {
            //File does not exist, copy it
            [fileManager copyItemAtPath:oldFilePath toPath:newFilePath error:&error];
        } else {
            NSLog(@"File exists: %@", newFilePath);
        }
    }
}

- 编辑11/9/2011 - 对此我很抱歉,因为我预先警告我无法访问我的mac来验证代码.更新了代码,我已经验证它现在正常工作.添加了几个快速NSLog,告诉您新目录或新文件是否已存在.