Question

我希望在应用程序启动时将多个文件从我的NSBundle复制到Documents目录。

这是复制文件的代码：

- (NSString *) getPath 
{
  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory , NSUserDomainMask, YES);
  NSString *documentsDir = [paths objectAtIndex:0];
  return [documentsDir stringByAppendingString:@"Photo.png"];
}

- (void) copyFile 
{
  NSFileManager *fileManager = [NSFileManager defaultManager];
  NSError *error;
  NSString *Path = [self getPath];
  BOOL success = [fileManager fileExistsAtPath:Path];

  if(!success) {

    NSString *defaultPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Photo.png"];
    success = [fileManager copyItemAtPath:defaultPath toPath:Path error:&error];

    if (!success)
        NSAssert1(0, @"Failed to create writable file with message '%@'.", [error localizedDescription]);
  }
}

将在'applicationDidFinishLaunchingWithOptions'方法中调用copyFile方法。但是此方法仅允许将一个文件复制到Documents目录。如果我想从我的NSBundle复制50个文件，这是否意味着我必须指定50个路径？有没有更短的方法，例如只用几行代码获取NSBundle中的所有文件？

Answer 1

您可以复制资源文件夹中的所有文件，但我怀疑您是否真的想这样做，是吗？毕竟这些也是应用程序资源（如字符串文件或仅用于UI按钮的图形等）

因此，您可能希望在资源文件夹中有一个子目录（例如，名为FilesToCopy），其中包含您要复制的所有文件（例如Photo.png处的Contents/Resources/FilesToCopy/Photo.png）

要获取目录的内容，只需使用

NSError * err;
NSArray * files;
NSString * srcPath;
NSString * dstPath;
NSFileManager * man;

srcPath = [self getSrcPath];
dstPath = [self getDstPath];
man = [[NSFileManager alloc] init];
files = [man contentsOfDirectoryAtPath:srcPath error:&err];

然后您可以一次复制一个文件：

for (NSString *aFile in files) {
    BOOL success;

    NSString * srcFile = [srcPath stringByAppendingPathComponent:aFile];
    NSString * dstFile = [dstPath stringByAppendingPathComponent:aFile];
    success = [man copyItemAtPath:srcFile toPath:dstFile error:&err];
    // Verify success
}

现在您只需要srcPath和dstPath。

- (NSString *)getSrcPath
{
     return [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"FilesToCopy"];
}

- (NSString *)getDstPath
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory , NSUserDomainMask, YES);
    return [paths objectAtIndex:0];
}

Answer 2

更改你的功能原型：

- (NSString *) getPathofFileName:(NSString*)name;
- (void) copyFileWithName:(NSString*)name;

Answer 3

是的，你确定你能做到这一点

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{

    NSMutableArray *filesArray = [NSMutableArray arrayWithObjects:@"0.epub",@"1.epub",@"2.epub",@"3.epub",@"4.epub",nil];//here put the name of files you want to copy
    [self copyFilesToDocuments:filesArray];

    [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleBlackOpaque;
    self.window.rootViewController = (UIViewController*)self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

- (void) copyFilesToDocuments : (NSMutableArray*)filesArr {
    NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,        NSUserDomainMask, YES) lastObject];

    for(int i = 0 ; i < [filesArr count] ; i++) {
        NSString *filePath = [docDir stringByAppendingPathComponent:[filesArr objectAtIndex:i]];
        NSFileManager *fm = [NSFileManager defaultManager];
        BOOL exist = [fm fileExistsAtPath:filePath];
        NSError *error = nil;

        if (!exist) {
            NSString *path = [[[NSBundle mainBundle] resourcePath]stringByAppendingPathComponent:[filesArr objectAtIndex:i]];
            BOOL success = [fm copyItemAtPath:path toPath:filePath error:&error];
            if (!success) {
                NSAssert1(0,@"%@",[error localizedDescription]);
            }
        }
    }
}

将多个文件复制到Documents目录

3 个答案: