1、清除手機APP上的角標badge

- (void)applicationWillEnterForeground:(UIApplication *)application {
    [application setApplicationIconBadgeNumber:0];
    [application cancelAllLocalNotifications];
}

這種方式會刪除角標但同時也會刪除通知欄的通知信息
2、還有一種方式 只會清除角標但是不會清除通知欄的信息

//不在appIcon上顯示推送數(shù)量，但是在系統(tǒng)通知欄保留推送通知的方法
#define isIOS11 ([[UIDevice currentDevice].systemVersion floatValue] >= 11)

-(void)resetBageNumber{
  if(isIOS11){
    /*
     iOS 11后，設置badgeNumber = -1就生效了
     */
    [UIApplication sharedApplication].applicationIconBadgeNumber = -1;
  }else{
    UILocalNotification *clearEpisodeNotification = [[UILocalNotification alloc] init];
    clearEpisodeNotification.fireDate = [NSDate dateWithTimeIntervalSinceNow:(0.3)];
    clearEpisodeNotification.timeZone = [NSTimeZone defaultTimeZone];
    clearEpisodeNotification.applicationIconBadgeNumber = -1;
    [[UIApplication sharedApplication] scheduleLocalNotification:clearEpisodeNotification];
  }

}