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iOS 通知

iOS有两套通知API, iOS10前使用UILocalNotification, 以后使用UNUserNotificationCenter.

UILocalNotification, iOS8以后应用需要registerUserNotificationSettings:函数注册通知.

if ([[UIApplication sharedApplication] respondsToSelector:@selector(registerUserNotificationSettings:)]) {
     UIUserNotificationType type =  UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound;
     UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:type categories:nil];
     [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
}

UNUserNotificationCenter, iOS10使用requestAuthorizationWithOptions:函数注册通知.

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

接受UNUserNotificationCenterDelegate代理.

当iOS10以后, 当应用在前台, 通知默认是不显示的. 显示通知实现UNUserNotificationCenterDelegate代理 userNotificationCenter函数

  - (void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler {
      completionHandler(UNNotificationPresentationOptionAlert | UNNotificationPresentationOptionSound); 
  }

Reference

User Notifications
iOS8 本地推送 UILocalNotification
iOS10 本地推送 UNUserNotificationCenter

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