Library/PreferencesをiCloudのバックアップ対象から外す

SkipBackup.m

//バックアップ対象から外す
- (NSString *)myDocumentsPath
{
    NSString *documentsPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Preferences"];
    return documentsPath;
}

- (BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)URL
{
    assert([[NSFileManager defaultManager] fileExistsAtPath: [URL path]]);
    
    NSError *error = nil;
    BOOL success = [URL setResourceValue: [NSNumber numberWithBool: YES]
                                  forKey: NSURLIsExcludedFromBackupKey error: &error];
    if(success){
        CCLOG(@"Skip %@", URL);
    }
    else{
        NSLog(@"Error excluding %@ from backup %@", [URL lastPathComponent], error);
    }
    return success;
}

- (BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)URL
{
    //バックアップ無効
    NSString *filePath = [self myDocumentsPath];
    NSURL *dirUrl = [NSURL fileURLWithPath:filePath];
}