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

问题描述

我试图复制一个文件夹在我的NSBundle包含相当多的图像。

我试着用这些代码。

  NSFileManager * fileManager = [NSFileManager defaultManager]; 
 NSError *错误; 
 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]; 
  

可以说名为Test.png的文件夹中有一个图像，我想在图像上显示图像按钮，它不起作用！

但是，如果我只从NSBundle复制到NSDocumentDirectory的单个图像，它的工作！

$ b 示例： / b>

更改

  stringByAppendingPathComponent：@Images
  

  stringByAppendingPathComponent ：@Test.png
  

所以问题在于将文件夹复制到NSDocumentDirectory！

上面的代码是不正确的吗？

或者复制文件夹是不可能的？ （这意味着我必须单独复制文件）

解决方案

奥斯卡是正确的，目前没有办法复制整个文件夹一个单一的命令。

像这样的方法可能会诀窍（预警 - 我的办公室连接已关闭，我无法访问我的Mac来验证此代码正在工作一旦我能够验证这一点）。只需要调用[self copyDirectory：@Images]，它就可以处理剩下的事情。

   - （void）copyDirectory :( NSString *）目录{
 NSFileManager * fileManager = [NSFileManager defaultManager]; 
 NSError *错误; 
 NSArray * paths = NSSearchPathForDirectoriesInDomains（NSDocumentDirectory，NSUserDomainMask，YES）; 
 NSString * documentsDirectory = [paths objectAtIndex：0]; 
 NSString * documentDBFolderPath = [documentsDirectory stringByAppendingPathComponent：directory]; 
 NSString * resourceDBFolderPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent：directory]; $！
 $ b if（！[fileManager fileExistsAtPath：documentDBFolderPath]）{
 //创建目录！ 
 [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]）{
 //文件不存在，复制
 [fileManager copyItemAtPath：oldFilePath toPath：newFilePath error：& error]; 
} else {
 NSLog（@File exists：％@，newFilePath）; 
 
 
 
 
 
 
  - 编辑11/9 / 2011  -  
对不起，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。添加了几个快速的NSLogs来告诉你新的目录或新的文件是否已经存在。
 
I am trying to copy a folder in my NSBundle which contains quite a number of images.

I tried doing it with these codes.
    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];
Lets say there's an image in the folder named Test.png and i want to display the image on my button, it does not work!
However, if i only copied a single image from the NSBundle to NSDocumentDirectory, it works!
Example:
Changing  
stringByAppendingPathComponent:@"Images"
To
stringByAppendingPathComponent:@"Test.png"
So the problem lies with copying the folder to NSDocumentDirectory!
Are my codes above incorrect?
Or it is impossible to copy folders? (Which means i have to copy files individually)
 解决方案 
Oscar is correct, there is currently no way to copy an entire folder with a single command.
A method such as this might do the trick (forewarning - my office connection is down and I can't access my Mac to verify this code is working.  Will verify this once I am able).  Simply call with [self copyDirectory:@"Images"] and it will handle the rest.
-(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);
        }
    }
}
-- EDIT 11/9/2011 --Sorry about that, as I forewarned I was not able to access my mac to verify the code.Updated the code and I have verified it is working properly now.  Added a couple quick NSLogs to tell you if the new directory or the new file already exists.
                        
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