新浪微博客户端(21)-获取当前微博未读数并提示用户

HomeViewController.m

- (void)viewDidLoad {
    [super viewDidLoad];

    // 初始化NavigationItem
    [self initNavigationItem];
    // 初始化TitleView
    [self initTitleView];
    // 更新TitleView 显示名称
    [self updateTitleViewDisplayName];
    // 集成下拉刷新控件
    [self setupPullToRefreshView];
    // 授权显示通知
    [self requestDisplayBadge];
    
    // 获取微博未读数
    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(setupUnReadCount) userInfo:nil repeats:YES];
    [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
    
}



/** iOS8中如果想要设置ApplicationIconBadgeNumber，需要用户授权 */
- (void)requestDisplayBadge {
    
    float version = [[[UIDevice currentDevice] systemVersion] floatValue];
    if (version >= 8.0) {
        UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge categories:nil];
        [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
    }
    
}



/** 清空所有通知提示 */
- (void)clearAllBadgeTips {
    self.tabBarItem.badgeValue = nil;
    [UIApplication sharedApplication].applicationIconBadgeNumber = 0;

}



/** 每隔5秒向新浪发送一次请求，获取当前微博未读数量 */
- (void)setupUnReadCount {

    AFHTTPSessionManager *requestManager = [AFHTTPSessionManager manager];
    
    NSString *urlString = @"https://rm.api.weibo.com/2/remind/unread_count.json";
    NSMutableDictionary *params = [NSMutableDictionary dictionary];
    DJAccount *account = [DJAccountTool account];
    params[@"access_token"] = account.access_token;
    params[@"uid"] = account.uid;
    
    [requestManager GET:urlString parameters:params progress:nil success:^(NSURLSessionDataTask * _Nonnull task, NSDictionary *  _Nullable responseObject) {
        NSString *unReadCount = [responseObject[@"status"] description];
        if ([unReadCount isEqualToString:@"0"]) { // 没有未读的微博数据
            [self clearAllBadgeTips];
        } else { // 有未读的微博数据
            self.tabBarItem.badgeValue = unReadCount;
            [UIApplication sharedApplication].applicationIconBadgeNumber = [unReadCount intValue];
        }
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        
    }];
    
}

最终效果：