Question

我需要在前台显示本地通知。我读到这可以在iOS10 UserNotifications框架中引入。我尝试实现它并仅在后台获取通知。在前台-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification被调用但未显示通知视图。我希望它在前景和背景上显示，可以点击并在点击时触发方法。这是可能的，如果是的话我的代码中缺少什么。这是代码：在AppDelegate中：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.

UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
center.delegate = self;
UNAuthorizationOptions options = UNAuthorizationOptionAlert + UNAuthorizationOptionSound;
[center requestAuthorizationWithOptions:options
                      completionHandler:^(BOOL granted, NSError * _Nullable error) {
                          if (!granted) {
                              NSLog(@"Something went wrong");
                          }
                      }];

return YES;
}

-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler {
NSLog(@"Will present notification");
}

-(void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void (^)(void))completionHandler {
NSLog(@"Did Receive Notification Response");
}

在ViewController中：

- (void)locationManagerDidEnterRegionOfCamera:(NSString *)cameraName {
NSDictionary *info = @{ kRegionNotificationDictionaryCameraName : cameraName };

// Check if the switch was previously set to off and not fire notification
if ([[NSUserDefaults standardUserDefaults] boolForKey:@"switch"]) {

    if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"10.0.0")) {
        UNMutableNotificationContent *content = [UNMutableNotificationContent new];
        content.title = @"Don't forget";
        content.body = @"Buy some milk";
        content.sound = [UNNotificationSound defaultSound];

        UNTimeIntervalNotificationTrigger *trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:1
                                                                                                        repeats:NO];

        NSString *identifier = @"UYLLocalNotification";
        UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:identifier
                                                                              content:content trigger:trigger];

        UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
        [center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {
            if (error != nil) {
                NSLog(@"Something went wrong: %@",error);
            } else {

            }
        }];

    } else {
        [NotificationsHelper scheduleRegionNotificationWithInfo:info];
    }
}
}

Answer 1

重要的方法是：userNotificationCenter:willPresentNotification:withCompletionHandler:

来自documentation：

completionHandler 使用演示文稿选项执行的块。始终在某个时刻执行此块   在您执行此方法期间。指定一个选项   指示您希望系统如何提醒用户（如果有的话）。这个   block没有返回值并采用以下参数：

选项用于通知用户的选项。指定UNNotificationPresentationOptionNone以使任何警报静音。通过   其他值，用于指定要允许的警报类型。对于   有关可用警报选项的信息，请参阅   UNNotificationPresentationOptions。

Apple Programming Guide

上的其他信息

计划是什么：

假设您希望以不同的方式处理这两种类型的通知，即使应用程序位于前台，您也希望显示警报，另一种只是声音。这就是你使用这种方法的原因。

分析UNNotification，根据您的选择，最后致电completionHandler(someValue)，其中someValue是UNNotificationPresentationOptions（这是现实中的一面旗帜，你应该能够将它们结合起来）。你想要的至少是UNNotificationPresentationOptionAlert。

示例代码：

- (void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler {
   UNNotificationPresentationOptions options;
   //Read the notification object, parse some info, decide on what do to by settings options
   if (something)
   {
       //Show badge
       options = UNNotificationPresentationOptionBadge;
   } 
   else if (somethingElse) 
   {
       //Show alert and make sound
       options = UNNotificationPresentationOptionSound | UNNotificationPresentationOptionAlert;
   } 
   else ...

   completionHandler(options);
}

本地通知视图显示在前景

1 个答案: