判断 相册隐私权限

    ALAuthorizationStatus authStatus = [ALAssetsLibrary authorizationStatus];

    if (authStatus == kCLAuthorizationStatusRestricted || authStatus ==kCLAuthorizationStatusDenied)

    {//authStatus!= AVAuthorizationStatusNotDetermined

        //无权限 提示allert

        UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"提示" message:@"您当前尚未获得系统相册授权，请到系统设置－隐私－相册－应用 中打开相册权限" delegate:self cancelButtonTitle:@"确定" otherButtonTitles: nil];

        [alert show];

        return;

    }