如何向 UILocalNotification 警报添加操作按钮/操作？

Question

我在我的应用程序中安排了一个本地通知，现在当我向左滑动警报时，我得到一个通用的取消（交叉）按钮。

我很好奇是否可以像下图那样添加自定义按钮/操作？

Answer 1

我为你准备了一些代码片段，在 ViewDidLoad 方法显示后 10 秒显示一个按钮通知。

  import UIKit

    class TestViewController: UIViewController {

        let category = UIMutableUserNotificationCategory()

        override func viewDidLoad() {
            super.viewDidLoad()

            let restartAction = UIMutableUserNotificationAction()
            restartAction.identifier = "xx"
            restartAction.destructive = false
            restartAction.title = "Restart"
            restartAction.activationMode = .Background
            restartAction.authenticationRequired = false

            let categoryIdentifier = "category.identifier"
            category.identifier = categoryIdentifier
            category.setActions([restartAction], forContext: .Minimal)
            category.setActions([restartAction], forContext: .Default)

            let categories = Set(arrayLiteral: category)
            let settings = UIUserNotificationSettings(forTypes: [.Alert, .Sound], categories: categories)
            UIApplication.sharedApplication().registerUserNotificationSettings(settings)


            let localNotif = UILocalNotification()
            localNotif.alertBody = "testBody"
            localNotif.category = categoryIdentifier

            // Notification will be shown after 10 second (IMPORTANT: if you want to see notification you have to close or put app into background)
            localNotif.fireDate = NSDate().dateByAddingTimeInterval(10)
            UIApplication.sharedApplication().scheduleLocalNotification(localNotif)
        }

    }

注意：您必须在 AppDelegate 方法中处理操作：

func application(application: UIApplication, handleActionWithIdentifier identifier: String?,
                forLocalNotification notification: UILocalNotification, completionHandler: () -> Void) {

  completionHandler()
}

当然，我的代码并不像应有的那么干净，但你必须知道我写它只是为了演示目的。

这段代码是用 Swift 编写的，但转换为 Objective C 应该非常简单。