Swift/iOS:如何将数据从AppDelegate传递到ViewController标签? [英] Swift / iOS: How to pass data from AppDelegate to ViewController label?

问题描述

我有一个(非常)基本的通用链接测试程序，该程序可以正确地从指向相关域的链接启动.它将接收到的URL打印到调试控制台.

I've got a (very) basic Universal Links test program that correctly launches from a link to the associated domain. It prints the received URL to the debug console.

在AppDelegate.swift中:

in AppDelegate.swift:

func application(_ application: UIApplication, continue userActivity: NSUserActivity, restorationHandler: @escaping ([UIUserActivityRestoring]?) -> Void) -> Bool {
    // First attempt at handling a universal link
    print("Continue User Activity called: ")
    if userActivity.activityType == NSUserActivityTypeBrowsingWeb,
        let url = userActivity.webpageURL {
        //handle URL
        let u = url.absoluteString
        print(u)
  }
    return true
}

ViewController.swift:

ViewController.swift:

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var result: UILabel!
      
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        print("Ready ..")
        result.text = "view did load"
   }

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

我只想用接收到的URL更新UILabel，以显示其正常工作.

I just want to update the UILabel with the received URL, to show it's working.

我尝试将NSUserActivity处理程序放入ViewController中，该处理程序可以编译但不起作用.

I've tried putting the NSUserActivity handler into ViewController, that compiles but doesn't work.

我尝试在ViewController中创建一个可以从AppDelegate调用的方法，但不知道如何解决(我是Swift初学者).

I've tried creating a method in ViewController that I can call from AppDelegate, but don't know how to address it (I'm a Swift beginner).

如何获取用于更新UILabel文本的URL?

How can I get the URL to update the UILabel text?

推荐答案

如果它是根，则可以执行此操作

You can do this if it's the root

if let vc = self.window?.rootViewController as? ViewController {
    vc.result.text = u
}

对于完整的解决方案，您应该使用获得最高的UIViewController 来获得最高的vc ，然后像上面一样投射

For a complete solution you should get the top most vc with Get top most UIViewController then cast it like above

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