ContactGetter *get = [[ContactGetter alloc]init];

    //cause the Permission alert will Blocking main thread,so delayed the function.
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

        [get GET:^(NSDictionary *Result) {

            NSLog(@"%@",Result);

        } failure:^(BOOL Result) { // The bool value named result,that means No contacts data or has no permission

            if (Result) {
                NSLog(@"No Data");
            }else{
                NSLog(@"No Permission");
                //jump to setting
            }

        }];

    });