後台提醒數字（應用程式applicationIcon上的數字)

標籤：

@property(nonatomic) NSInteger applicationIconBadgeNumber;  // set to 0 to hide. default is 0. In iOS 8.0 and later, your application must register for user notifications using -[UIApplication registerUserNotificationSettings:] before being able to set the icon badge.

 

發現8.0以後，要先寫-[UIApplication registerUserNotificationSettings:]這個方法

 

於是：

 [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge categories:nil]];

        [UIApplication sharedApplication].applicationIconBadgeNumber = [responseObject[@"status"] intValue];

 

應用程式進入後台預設處於休眠狀態，這樣就無法及時讀取未讀訊息數，那怎麼辦呢？

 

在後台開啟任務讓程式時刻保持運行狀態：（能維持啟動並執行時間是不確定的，

後台提醒數字（應用程式applicationIcon上的數字)