如何在Xcode、Swift 4中设置iOS APP拦截指定链接并自动启动

Hey there! Let's walk through setting this up exactly like YouTube does—so your app automatically launches when users tap specific HTTP/HTTPS links, preventing them from opening in Safari by accident. This relies on Apple's Universal Links feature, which is the same mechanism YouTube uses for its domain. Here's your step-by-step guide:

1. Configure Xcode Project Settings #

First, link your app to your target domain in Xcode:

• Open your project, select your app target, and go to the Info tab.
• Scroll down to URL Types and click the + button:
  • For Identifier, use a unique string (usually your app's bundle ID, e.g., com.yourcompany.yourapp).
  • For URL Schemes, add a custom scheme like yourapp (this is a fallback for testing, not strictly required for Universal Links).
• Next, head to the Signing & Capabilities tab (enable it via Editor > Add Capability if you don't see it).
• Add the Associated Domains capability, then click + under Domains and enter your domain in the format applinks:yourdomain.com (replace yourdomain.com with the exact domain you want to intercept, like applinks:yourapp.com).

2. Create & Host the Apple App Site Association (AASA) File #

This JSON file proves you own the domain and tells Apple which links your app should handle:

• Make a file named apple-app-site-association (no file extension) with this structure:

{
  "applinks": {
    "apps": [],
    "details": [
      {
        "appID": "YOUR_TEAM_ID.com.yourcompany.yourapp",
        "paths": [ "/protected/*", "/critical-link" ]
      }
    ]
  }
}

• Replace YOUR_TEAM_ID with your Apple Developer Team ID (find it in your Developer Account or Xcode's Signing & Capabilities tab).
• Swap com.yourcompany.yourapp with your app's actual bundle ID.
• The paths array defines which links to intercept: use /* to block all links on the domain, /protected/* for a specific path, or /critical-link for an exact URL.
• Host this file at either https://yourdomain.com/apple-app-site-association or https://yourdomain.com/.well-known/apple-app-site-association. Ensure it's served over HTTPS with the application/json Content-Type header.

3. Handle Links in Your Swift 4 Code #

Now make your app respond when launched via a Universal Link:

For iOS 12 & Earlier (AppDelegate): #

Open AppDelegate.swift and add these methods:

func application(_ application: UIApplication, continue userActivity: NSUserActivity, restorationHandler: @escaping ([UIUserActivityRestoring]?) -> Void) -> Bool {
    if userActivity.activityType == NSUserActivityTypeBrowsingWeb {
        guard let interceptedURL = userActivity.webpageURL else { return false }
        // Do something with the URL—e.g., navigate to a specific screen, or just log it
        print("Stopped user from opening: \(interceptedURL)")
        // Return true to confirm your app handled the link
        return true
    }
    return false
}

For iOS 13+ (SceneDelegate): #

If your app uses Scenes (common in newer iOS versions), add this to SceneDelegate.swift:

func scene(_ scene: UIScene, continue userActivity: NSUserActivity) {
    if userActivity.activityType == NSUserActivityTypeBrowsingWeb {
        guard let interceptedURL = userActivity.webpageURL else { return }
        // Handle the intercepted URL here
        print("Intercepted link: \(interceptedURL)")
    }
}

4. Test the Setup #

• You can only test Universal Links on a physical iOS device (simulators don't support this feature).
• Install your app on the device using a valid developer certificate.
• Open Safari and type a link that matches your paths configuration (e.g., https://yourdomain.com/protected/test).
• You'll see a banner asking to open the link in your app—tap "Open" to confirm it works.

Quick Notes #

• If the app isn't installed, the link will open in Safari as usual (there's no way to block that entirely).
• Validate your AASA file using Apple's official App Search API Validation Tool to catch any formatting issues.
• If you need to handle custom scheme links (like yourapp://settings), use application(_:open:options:) in AppDelegate or scene(_:openURLContexts:) in SceneDelegate.

内容的提问来源于stack exchange，提问作者NiteIsAFK