ios - 当应用程序在同一 View iOS Swift 时限制 segue

Question

我在我的应用程序中使用推送通知并在点击通知时执行 segue 但问题是如果应用程序在某个 View 上并且通知来自同一 View ，那么 segue 会在同一 View 上执行并且相同的 View 会出现在该 View 上看法。如果 View 相同，我不希望发生这种情况，那么它不应该执行 segue。这是我的代码

 if application.applicationState == UIApplicationState.background{
        let moduleName = userInfo.value(forKey: "click_action") as! String
        let timestamp = Int64(date.timeIntervalSince1970)
        let description = userInfo.value(forKey: "body") as! String
        let title = userInfo.value(forKey: "title") as! String

        let entity = NSEntityDescription.entity(forEntityName: "Notifications", in: DataBaseController.persistentContainer.viewContext)

        let managedObj=NSManagedObject(entity: entity!, insertInto: DataBaseController.persistentContainer.viewContext)

        managedObj.setValue(moduleName, forKey: "click")
        managedObj.setValue(description, forKey: "body")
        managedObj.setValue(timestamp, forKey: "timestamp")
        managedObj.setValue(title, forKey: "title")

        DataBaseController.saveContext()


        if (homeVC != nil){

            homeVC?.performSegue(withIdentifier: moduleName, sender: homeVC)

        }

    }

}

homeView Controller 中的方法

  //MARK:- Navigation Methods
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
{
    let backItem = UIBarButtonItem()
    backItem.title = "Home"
    navigationItem.backBarButtonItem = backItem // This will show in the next view controller being pushed

    if(segue.identifier == "notificationconnew"){
        let notObj = segue.destination as! NotificationsTableViewController
        notObj.homeVC = self
    }


}

override func shouldPerformSegue(withIdentifier identifier: String, sender: Any?) -> Bool {

    if identifier == segueString && self.navigationController?.viewControllers.last is MyEarningViewController{
        return false
    }
    else{
        return true
    }
}

App Delegate中homeVc对象的声明

class AppDelegate: UIResponder, UIApplicationDelegate{

var window: UIWindow?
var notification : NSDictionary?
var homeVC : HomeViewController?
lazy var dBhandler = DBHandler()
let date = NSDate()

并在 HomeViewController 的 viewDidLoad 中给出实例

// Giving instance of HomeViewController to AppDelegate
    let appDele = UIApplication.shared.delegate as! AppDelegate
    appDele.homeVC = self

检查这个 enter image description here

Answer 1

我遇到了这个 SO thread并注意到，当您自己调用 performSegue 时，它永远不会为此调用 shouldPerformSegue。现在只有一个，那就是只有当您当前的 Controller 不是 segue 的目标 Controller 时，您才需要调用 performSegue。所以像这样在 AppDelegate 中进行更改。

if (homeVC != nil && !(homeVC?.navigationController?.viewControllers.last is MyEarningViewController)){
     homeVC?.performSegue(withIdentifier: moduleName, sender: homeVC)
}

因此，从您的 HomeViewController 中删除 shouldPerformSegue，现在不再需要它，并通过比较 homeVC 的 navigationStack 调用 performSegue。