仅当应用程序关闭时才会发出通知[重复]答案

【问题标题】：Notification comes only when the app is closed [duplicate]仅当应用程序关闭时才会发出通知[重复]
【发布时间】：2021-10-27 23:19:08
【问题描述】：

我想在我的应用上安排每日通知。但问题是当应用程序打开时通知不会出现，只有当我退出应用程序时才会出现通知。

注意：我是ios开发的初学者

我的功能：

func sheduleDailyLocalNotification() {
    
    let calendar = Calendar.current
    let hour = calendar.component(.hour, from: currentDate)
    let minute = calendar.component(.minute, from: currentDate)

    
    UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound]) { success, error in
        
        if success {
            
            let content = UNMutableNotificationContent()
            content.title = "iGrow Goals"
            content.subtitle = "Don't forget to check your today's goal steps"
            content.sound = UNNotificationSound.default
            
            // Configure the recurring date.
            var dateComponents = DateComponents()
            dateComponents.calendar = Calendar.current
            
            dateComponents.hour = hour
            dateComponents.minute = minute
            
            let trigger = UNCalendarNotificationTrigger(
                dateMatching: dateComponents, repeats: false)
            
            // choose a random identifier
            let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
            
            // add our notification request
            UNUserNotificationCenter.current().add(request)
                            
        }else if let error = error {
            print(error.localizedDescription)
        }
        
    }
    
    
}

【问题讨论】：

标签： ios swift

【解决方案1】：

像这样设置 UNUserNotificationCenter 委托（在您的应用生命周期的早期）：

let userNotificationCenter = UNUserNotificationCenter.current()
userNotificationCenter.delegate = self
// delegate must adopt UNUserNotificationCenterDelegate protocol

然后在 UNUserNotificationCenter 委托中实现这个方法：

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
    completionHandler([.badge, .alert, .sound]) // Insert in the returned array what the app should handle
}

如果在您的应用处于前台时触发通知，则假定您的应用会处理它（可能使用自定义行为和界面），但实现上述方法可以触发默认行为。

【讨论】：