NotificationPermissionStrategy.m

//
//  NotificationPermissionStrategy.m
//  permission_handler
//
//  Created by Tong on 2019/10/21.
//

#import "NotificationPermissionStrategy.h"

#if PERMISSION_NOTIFICATIONS

@implementation NotificationPermissionStrategy

- (PermissionStatus)checkPermissionStatus:(PermissionGroup)permission {
  return [NotificationPermissionStrategy permissionStatus];
}

- (void)checkServiceStatus:(PermissionGroup)permission completionHandler:(ServiceStatusHandler)completionHandler {
    completionHandler(ServiceStatusNotApplicable);
}

- (void)requestPermission:(PermissionGroup)permission completionHandler:(PermissionStatusHandler)completionHandler  errorHandler:(PermissionErrorHandler)errorHandler {
  PermissionStatus status = [self checkPermissionStatus:permission];
  if (@available(iOS 12.0, *)) {
    if (status != PermissionStatusDenied && status != PermissionStatusProvisional && status != PermissionStatusUndetermined) {
      completionHandler(status);
      return;
    }
  } else if (status != PermissionStatusDenied && status != PermissionStatusUndetermined) {
    completionHandler(status);
    return;
  }
  dispatch_async(dispatch_get_main_queue(), ^{
    if(@available(iOS 10.0, *)) {
      UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
      UNAuthorizationOptions authorizationOptions = 0;
      authorizationOptions += UNAuthorizationOptionSound;
      authorizationOptions += UNAuthorizationOptionAlert;
      authorizationOptions += UNAuthorizationOptionBadge;
      [center requestAuthorizationWithOptions:(authorizationOptions) completionHandler:^(BOOL granted, NSError * _Nullable error) {
        dispatch_async(dispatch_get_main_queue(), ^{
            if (error == nil && !granted) {
              UIApplicationState state = [UIApplication sharedApplication].applicationState;
              if (state != UIApplicationStateActive) {
                completionHandler(PermissionStatusUndetermined);
                return;
              }
            }
            if (error != nil || !granted) {
              completionHandler(PermissionStatusPermanentlyDenied);
              return;
            }
            [[UIApplication sharedApplication] registerForRemoteNotifications];
            completionHandler(PermissionStatusGranted);
        });
      }];

    } else {
      UIUserNotificationType notificationTypes = 0;
      notificationTypes |= UIUserNotificationTypeSound;
      notificationTypes |= UIUserNotificationTypeAlert;
      notificationTypes |= UIUserNotificationTypeBadge;
      UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:notificationTypes categories:nil];
      [[UIApplication sharedApplication] registerUserNotificationSettings:settings];

      [[UIApplication sharedApplication] registerForRemoteNotifications];
      completionHandler(PermissionStatusGranted);
    }
  });
}

+ (PermissionStatus)permissionStatus {
  __block PermissionStatus permissionStatus = PermissionStatusGranted;
  if (@available(iOS 10 , *)) {
    dispatch_semaphore_t sem = dispatch_semaphore_create(0);
    [[UNUserNotificationCenter currentNotificationCenter] getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {
      if (@available(iOS 12 , *) && settings.authorizationStatus == UNAuthorizationStatusProvisional) {
        permissionStatus = PermissionStatusProvisional;
      } else if (settings.authorizationStatus == UNAuthorizationStatusDenied) {
        permissionStatus = PermissionStatusPermanentlyDenied;
      } else if (settings.authorizationStatus == UNAuthorizationStatusNotDetermined) {
        permissionStatus = PermissionStatusUndetermined;
      }
      dispatch_semaphore_signal(sem);
    }];
    dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
  } else if (@available(iOS 8 , *)) {
    UIUserNotificationSettings * setting = [[UIApplication sharedApplication] currentUserNotificationSettings];
    if (setting.types == UIUserNotificationTypeNone) permissionStatus = PermissionStatusDenied;
  } else {
      permissionStatus = PermissionStatusPermanentlyDenied;
  }
  return permissionStatus;
}

@end

#else

@implementation NotificationPermissionStrategy
@end

#endif