Open iOS app from URL AND Pass Parameters

Question

A link should open the app. I\'ve got that to work. I just want to know how to pass a parameter. Let\'s say the url is \"addappt://?code=abc\". When a view controller pops u

Answer 1

Here is a nice tutorial on Using Custom URL Scheme in iOS

As in the tutorial, you should parse the URL parameters and store them to use in the app in this method:

- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {
  // Do something with the url here
}

Answer 2

On Xcode 12 this code works perfectly. You can imagine that this is also a URL as regular. In Source app you can call and open destination url with parameter like

    let url = URL(string: "DestinationApp:PATH?PARAMETER=11111")
           
    UIApplication.shared.open(url!) { (result) in
        if result {
            print(result)
           // The URL was delivered successfully!
        }
    }

Destination app can handle metod in AppDelegate with this method. Alert is for double check.

    func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
            // Determine who sent the URL.
            let sendingAppID = options[.sourceApplication]
            print("source application = \(sendingAppID ?? "Unknown")")
    
            // Process the URL.
            guard let components = NSURLComponents(url: url, resolvingAgainstBaseURL: true),
                let path = components.path,
                let params = components.queryItems else {
                    print("Invalid URL or path missing")
                    return false
            }
    
            if let parameter = params.first(where: { $0.name == "PARAMETER" })?.value {
                print("path = \(path)")
                print("parameter = \(parameter)")
    
                let alert = UIAlertController(title: "Path = \(path)", message: "Parameter = \(parameter)", preferredStyle: .alert)
    
                let keyWindow = UIApplication.shared.windows.filter {$0.isKeyWindow}.first
    
                if var topController = keyWindow?.rootViewController {
                    while let presentedViewController = topController.presentedViewController {
                        topController = presentedViewController
                    }
    
                    topController.present(alert, animated: true, completion: nil)
                }
                return true
            } else {
                print("parameter is missing")
                return false
            }
}