设置文件属性，使文件不进行iCloud备份

设置文件属性，使文件不进行iCloud备份

+ (BOOL)setSkipICloudBackupWithFileURL:(NSURL *)URL
{
    if(![[NSFileManager defaultManager] fileExistsAtPath:[URL path]])
    {
        return NO;
    }
    
    NSError *error = nil;
    BOOL success = [URL setResourceValue: [NSNumber numberWithBool: YES]
                                  forKey: NSURLIsExcludedFromBackupKey error: &error];
    return success;
}