UNUserNotificationCenter触发器不触发

Question

我正在尝试使用iOS 10的UserNotifications框架。

如果我不传递触发器，则通知的工作似乎很棒。他们会立即在应用程序中显示。但是我需要为触发传递一个延迟。谁能看到我代码中的漏洞？它应该使它延迟15秒，但它永远不会熄灭。

UNMutableNotificationContent* content = [[UNMutableNotificationContent alloc] init];
content.title = [NSString localizedUserNotificationStringForKey:@"Hello!" arguments:nil];
content.body = [NSString localizedUserNotificationStringForKey:@"Hello_message_body"
                                                     arguments:nil];
content.sound = [UNNotificationSound defaultSound];
content.categoryIdentifier = @"WhatUpsw";


NSString *imageName = @"hug2";

NSURL *url = [[NSBundle mainBundle]URLForResource:imageName withExtension:@"jpg"];


UNNotificationAttachment *attachment = [UNNotificationAttachment attachmentWithIdentifier:imageName URL:url options:nil error:nil];
content.attachments = @[attachment];                          

// Deliver the notification in five seconds.
UNTimeIntervalNotificationTrigger* trigger = [     UNTimeIntervalNotificationTrigger
                                              triggerWithTimeInterval:15 repeats:NO];

UNNotificationRequest* request = [UNNotificationRequest requestWithIdentifier:@"FiveSecondsw"
                                                                      content:content trigger:trigger];
// Schedule the notification.
[center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {
    if (error != nil) {
        NSLog(@"Something went wrong: %@",error);
    } else {
        NSLog(@"All good!: %@", request);
    }
}];

还检查未决的请求，我看到：

<__NSArrayM 0x17024d170>(
<UNNotificationRequest: 0x1702235c0; identifier: FiveSecond, content:   <UNNotificationContent: 0x17010bd00; title: Hello!, subtitle: (null), body: Hello_message_body, categoryIdentifier: , launchImageName: , peopleIdentifiers: (
), threadIdentifier: , attachments: (
), badge: (null), sound: <UNNotificationSound: 0x1700b4580>, hasDefaultAction: YES, defaultActionTitle: (null), shouldAddToNotificationsList: YES, shouldAlwaysAlertWhileAppIsForeground: NO, shouldLockDevice: NO, shouldPauseMedia: NO, isSnoozeable: NO, fromSnooze: NO, darwinNotificationName: (null), darwinSnoozedNotificationName: (null), trigger: <UNTimeIntervalNotificationTrigger: 0x170223780; repeats: NO, timeInterval: 10.000000>>
)

Answer 1

仅当您的应用程序在前台运行时，才会出现问题吗？如果在达到触发时间之前关闭应用程序或切换到另一个应用程序，则通知是否正常运行？

为了让应用程序运行时显示通知，您需要设置UNUserNotificationCenterDelegate在appController(_:didFinishLaunching:)：

func appController(_ appController: TVApplicationController, didFinishLaunching options: [String : Any]?) {
  // ...

  UNUserNotificationCenter.current().delegate = self

  // ...
}

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification,
                              withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)
{
  completionHandler(.alert)
}

需要在启动完成之前设置委托。