将通配符文件名从主包复制到Documents?

时间:2011-12-03 22:07:21

标签: iphone objective-c ios xcode cocoa-touch

我可以使用下面的代码通过文件名将文件从我的主包复制到我的Documents目录,但是如何根据通配符进行复制?例如,我有几个名为myimageX.jpg的文件(x代表一个随机数)。我想遍历我的主包中包含的所有内容,如果它们不存在于Documents中,请复制它们。

BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];

myfileName = @"myimage322.jpg";
documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
documentsDir = [documentPaths objectAtIndex:0];
filePath = [documentsDir stringByAppendingPathComponent:myfileName];

success = [fileManager fileExistsAtPath:filePath];
if(success) return;
NSString *filePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:myfileName];
[fileManager copyItemAtPath:filePathFromApp toPath:filePath error:nil];

[fileManager release];

1 个答案:

答案 0 :(得分:3)

方法fileExistsAtPath会很有帮助。首先枚举包的内容,检查文档中是否存在相同的文件(文件名相同)。

以下是如何操作:

NSString *docsDir = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
NSString *bundleDir = [[NSBundle mainBundle] resourcePath];

NSFileManager *localFileManager=[[NSFileManager alloc] init];
NSDirectoryEnumerator *dirEnum = [localFileManager enumeratorAtPath:bundleDir];

NSString *file;

while (file = [dirEnum nextObject]) {

    if (![[NSFileManager defaultManager] fileExistsAtPath: [docsDir stringByAppendingPathComponent:file]]) {

        [[NSFileManager defaultManager] copyItemAtPath:[bundleDir stringByAppendingPathComponent:file] 
                                                toPath:[docsDir stringByAppendingPathComponent:file] error:nil];         
    }

}

[localFileManager release];

这是来自NSFileManager类引用的代码的修改版本,可在此处找到: http://developer.apple.com/library/ios/#documentation/Cocoa/Reference/Foundation/Classes/NSFileManager_Class/Reference/Reference.html