对用户权限授予结果执行功能？

debugcn 发表于 Dev

杰克德姆

我问用户他们是否允许通知，如果他们同意，我想动画一个勾号。我不确定如何实现这一点，因为权限是异步的，我无法立即检测到结果来执行功能？

这是我当前的代码：

用户点击按钮并触发调用以授予权限并关闭以在完成时勾选按钮

func userDidTapNotifications() {
    self.appDelegate.setupNotifications { (success) -> Void in
        if success {
            notificationsGranted()
        }
    }
}

函数显示批准弹出窗口并完成关闭，问题是它将在用户选择一个选项作为异步之前完成，所以我在用户授予访问权限之前完成 true，导致问题。

func setupNotifications(completion: (_ success: Bool) -> Void) {
    center.requestAuthorization(options: [.badge, .alert , .sound]) { (granted, error) in
        if granted {
            DispatchQueue.main.async(execute: {
                UIApplication.shared.registerForRemoteNotifications()
            })
        }
    }
    completion(true)
}

在此之后，我在关闭完成时调用我的最终 func：

func notificationsGranted() {
    let isRegisteredForRemoteNotifications = UIApplication.shared.isRegisteredForRemoteNotifications
    if isRegisteredForRemoteNotifications {
        self.permissionsView.notificationsSwitch.setSelected(true, animated: true)
        self.userDefaults.set(true, forKey: "notificationsApproved")
        arePermissionsGranted()
    }
}

呈现权限警报的正确方法是什么，然后根据响应采取行动？

赛义德·卡马尔·阿巴斯

将您的完成处理程序存储在您的全局对象中AppDelegate，当didRegisterRemoteNotification方法被调用时，只需调用您已存储的完成处理程序......并且在您ViewController应该调用setUpNotification方法。

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var notificationCompletion: ((Bool)->Void)?



    func setUpNotification(completion: @escaping (Bool)->Void) {
        self.notificationCompletion = completion //Store the completion in a global property to use later.

        //Invoke Your Notification Registration methods...
        //Do not invoke the completion handle here...
    }
    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        //Permission is granted. Now invoke the completion that you have store to use later.
        if let completion = self.notificationCompletion {
            completion(true)
        }
    }
    func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
        //Permission is not granted/failed. Now invoke the completion that you have store to use later.
        if let completion = self.notificationCompletion {
            completion(false)
        }
    }
}


ViewController.swift

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        if let appDelegate = UIApplication.shared.delegate as? AppDelegate {
            appDelegate.setUpNotification(completion: { isPermissionGranted in
                if isPermissionGranted {
                    DispatchQueue.main.async {
                        self.notificationPermissionIsGranted()
                    }
                }

            })
        }
    }
    func notificationPermissionIsGranted() {
        //Animate Your View..
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

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