iOS开发本地推送

最近有个小需求，做一个本地的事件通知，要求选择起始时间和推送的时间间隔，并且要每天推送。借着这个机会把本地推送方面的知识有梳理一遍。

先来看一下大致的功能需求如下图：

1.png

主要实现原理

1. AppDelegate中设置

推送的样式，提醒用户使用推送原因(系统权限提醒)

UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
center.delegate = self;
UNAuthorizationOptions types=UNAuthorizationOptionBadge|UNAuthorizationOptionAlert|UNAuthorizationOptionSound;
 [center requestAuthorizationWithOptions:types completionHandler:^(BOOL granted, NSError * _Nullable error) {

  }];

根据granted的状态也能判断开关是否打开，如果是只有推送功能的APP，只有打开推送才能使用的话，这里就可以写跳转设置的代码。（APP首次运行，系统弹出时候允许推送，不允许直接跳转设置）

2.创建推送前的判断

判断通知开关是否打开，没有打开弹窗提醒，是否需要跳转设置中，打开开关。（首次运行时，用户不允许推送的情况）

 [[UNUserNotificationCenter currentNotificationCenter]getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {
          if ( settings.authorizationStatus==UNAuthorizationStatusAuthorized) {
               NSLog(@"通知开关打开");
          }else{
                  dispatch_async(dispatch_get_main_queue(), ^{

                    UIAlertController *shetVC = [UIAlertController alertControllerWithTitle:@"Tip" message:@"Open notifications in settings" preferredStyle:UIAlertControllerStyleAlert];
                    UIAlertAction *cancle = [UIAlertAction actionWithTitle:@"Cancle" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
                        [self.navigationController popViewControllerAnimated:YES];
                    }];
                    UIAlertAction *done = [UIAlertAction actionWithTitle:@"Yes" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                        [[UIApplication sharedApplication]openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString] options:@{UIApplicationOpenURLOptionUniversalLinksOnly:@""} completionHandler:^(BOOL success) { }];
                    }];
                    [shetVC addAction:cancle];
                    [shetVC addAction:done];
                    [self presentViewController:shetVC animated:YES completion:nil];
              });
        }
  }];

3.创建推送

用起始日期的方式实现每天的循环

-(void)addLocationNotifitionWithFrency:(NSString*)startTime endTime:(NSString*)endTime{
    
    NSArray *startArr = [startTime componentsSeparatedByString:@":"];
    NSInteger hour_start   = [startArr[0]integerValue];
    NSInteger minute_start = [startArr[1]integerValue];
    NSInteger num = 0;
    //时间间隔
    if ([self.timeBaseView.interValLable.text isEqualToString:@"1 hours"]) {
        num = 1;
    }else if ([self.timeBaseView.interValLable.text isEqualToString:@"2 hours"]){
        num = 2;
    }else if([self.timeBaseView.interValLable.text isEqualToString:@"3 hours"]){
        num = 3;
    }else if ([self.timeBaseView.interValLable.text isEqualToString:@"4 hours"]){
        num = 4;
    }else{
        num = 5;
    }
    //
    NSInteger cha_hour = [NSString chaEndTimeAndStartTime:startTime endTime:endTime];
    NSInteger cha      = cha_hour/num;//计算出起始时间内有多少个num（间隔num小时，要推送几次），
    //循环创建的时候最后一个时间（一定要区分ID,否则只会是一个推送）
    for (NSInteger index=0; index<cha; index++) {

        UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
        UNMutableNotificationContent *content = [[UNMutableNotificationContent alloc] init];
        content.title = @"Wash Hand";
        content.subtitle = @"It's time to wash hand";
        content.sound = [UNNotificationSound defaultSound];
        //设置最初时间，从哪一天开始，这里可以尽可能的往前设置，只要在你最初时间之前都可以
        NSDateFormatter * formatter = [[NSDateFormatter alloc]init];
        [formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
        NSString *dateString = [NSString stringWithFormat:@"2019-01-01 %ld:%ld:00",hour_start+index*num,minute_start];;
        NSDate * date = [formatter dateFromString:dateString];
        /*这是一个时间容器
          NSCalendarUnitYear
          NSCalendarUnitMonth
          NSCalendarUnitDay
          NSCalendarUnitHour
          NSCalendarUnitMinute
          NSCalendarUnitSecond
          NSCalendarUnitWeekday)*/
        //设置不同的容器可以实现不同的需求，这里我们是要每天推送的某时分秒推送
        NSDateComponents * components = [[NSCalendar currentCalendar]
        components:NSCalendarUnitHour |
                   NSCalendarUnitMinute |
                   NSCalendarUnitSecond
        fromDate:date];
        //两种trigger,这里UNCalendarNotificationTrigger符合我们要求
        UNCalendarNotificationTrigger * trigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:components
        repeats:YES];
        UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:[NSString stringWithFormat:@"time%ld",index] content:content trigger:trigger];
        //把通知加到UNUserNotificationCenter, 到指定触发点会被触发
        [center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {
            if (error) {
                NSLog(@"通知添加失败:%@",error);
            } else {
                NSLog(@"通知添加成功");
            }
        }];
    }
}

每天都推送，那么也就是从周日到周六的七天，因此也可利用NSCalendarUnitWeekday实现，周日为本周的第一天,NSCalendarUnitWeekday中weekday这里周日到周六是用1-7

传送门：参考链接