Question

我需要在用户关闭应用程序后立即显示本地通知（刷卡）。

为此，我有这样的代码：

- (void)applicationWillTerminate:(UIApplication *)application {

    [self showNotificationAboutClosingApp];
}

和

- (void) showNotificationAboutClosingApp {

    UNMutableNotificationContent *content = [[UNMutableNotificationContent alloc] init];
    content.title = @"test title";
    content.body = @"test body";
    content.sound = UNNotificationSound.defaultSound;

    NSString *requestIdentifier = [[NSUUID UUID] UUIDString];
    NSDate *fireDate = [NSDate dateWithTimeIntervalSinceNow:10.0];
    NSDateComponents *components = [[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian] components:kCFCalendarUnitSecond fromDate:fireDate];
    UNCalendarNotificationTrigger *trigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:components repeats:false];
    UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:requestIdentifier content:content trigger:trigger];

    [[UNUserNotificationCenter currentNotificationCenter] addNotificationRequest:request withCompletionHandler:nil];
}

有一个奇怪的行为：首次启动应用程序时，将其关闭（向上滑动）->通知将在10秒钟内出现。但是，当我重新打开应用程序并执行相同操作后，我的意思是通过向上滑动关闭应用程序，十秒钟后没有通知。我发现的结果-如果我从iPhone删除应用程序，然后关闭然后再次打开iPhone，安装应用程序，然后通过向上滑动关闭应用程序-出现通知。

任何想法我的方法有什么问题吗？

更新：

按照@MojtabaHosseini的建议，我将代码引导至这种类型：

//This class is the place where I prepare all stuff.
@objc class ClosingAppNotificationRequestProvider: NSObject {

    @objc public static let shared = ClosingAppNotificationRequestProvider()
    @objc public private(set) var closingAppNotificationRequest: UNNotificationRequest!
    @objc public static var requestIdentifier: String {
        get {
            return UUID().uuidString
        }
    }

    private override init() {}

    @objc public func initialize() {

        closingAppNotificationRequest = createClosingAppNotificationRequest()
    }

    private func createClosingAppNotificationRequest() -> UNNotificationRequest {

        let content = UNMutableNotificationContent()
        content.title = "some title";
        content.body = "some body";
        content.sound = UNNotificationSound.default()
        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 10, repeats: false)
        let request = UNNotificationRequest(identifier: ClosingAppNotificationRequestProvider.requestIdentifier, content: content, trigger: trigger)

        return request
    }
}

然后发起请求

-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

  [[ClosingAppNotificationRequestProvider shared] initialize];
}

当应用终止时：

-(void)applicationWillTerminate:(UIApplication *)application {

  UNNotificationRequest *closingAppNotificationRequest = [[ClosingAppNotificationRequestProvider shared] closingAppNotificationRequest];
  [[UNUserNotificationCenter currentNotificationCenter] addNotificationRequest:closingAppNotificationRequest withCompletionHandler:nil];
}

但是结果确实一样。

应用程序第二次关闭后，本地通知不出现

0 个答案: