ios 删除文件

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- (void)removeFileWithName:(NSString *)fileName{    // you need to write a function to get to that directory    NSString *filePath = [[self stringForDocumentDirectroy]stringByAppendingPathComponent:fileName];    NSFileManager *fileManager = [NSFileManager defaultManager];    if ([fileManager fileExistsAtPath:filePath])    {        NSError *error;        if (![fileManager removeItemAtPath:filePath error:&error])        {            NSLog(@"Error removing file: %@", error);        }        else        {            NSLog(@"successed removed file");        }    }}

?其中?[self stringForDocumentDirectroy]是document目录，