Change Webview Url from Appdelegate

Change WebView url from AppDelegate

You are force unwrapping url which is not a valid URL. I would suggest adding a guard statement to prevent the crash if a invalid URL is created:

func load_url(server_url: String) {
    guard let url = URL(string: server_url) else {
        print("Invalid URL")
        return
    }

    let request = URLRequest(url: url)
    my_web_view.loadRequest(request)
}

As you are obtaining the URL in the AppDelegate you cannot simply update the UIWebView from this class. You will need to call a function in the my_web_view's parent class which updates the URL.

// App Delegate

var serverURL: String?

func load_url(server_url: String) {
    serverURL = server_url
    let notificationName = Notification.Name("updateWebView")
    NotificationCenter.default.post(name: notificationName, object: nil)
}


// View Controller

override func viewDidLoad() {
    let notificationName = Notification.Name("updateWebView")
    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.updateWebView), name: notificationName, object: nil)

    updateWebView()
}

func updateWebView() {
    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    let serverURL = appDelegate.serverURL

    guard let url = URL(string: serverURL) else {
        print("Invalid URL")
        return
    }

    let request = URLRequest(url: URL)
    my_web_view.loadRequest(request)
}

How to control uiwebview from appdelegate.swift

Okay, I discovered to use local notification to solve this problem.

I changed the code is like this :

AppDelegate.swift:

NSNotificationCenter.defaultCenter().postNotificationName("applicationWillResignActive", object: nil)

added this line to the "viewDidLoad" func in ViewController.swift :

NSNotificationCenter.defaultCenter().addObserver(self, selector: "funcNameToFire:", name:"applicationWillResignActive", object: nil)

and added this function somewhere into the ViewController.swift:

    func funcNameToFire(notification: NSNotification){      
        let url = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("bar", ofType: ".html")!)!
        let request = NSURLRequest(URL: url)
        webView.loadRequest(request)
    }

Can't Change URL in WebView

In the appDelegate, instead of doing:

ViewController* myScript = [[ViewController alloc] init];
[myScript setWebViewURL:@"http://google.com"];

Here you are creating a new instance of your view controller and by this way your webView will be nil, hence you are not seeing the expected result.

You should post a notification in app delegate:

[[NSNotificationCenter defaultCenter] postNotificationName:@"refreshWebView" object:nil];

and in your viewController, listen to this notification:

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reloadWebView) name:@"refreshWebView" object:nil];

and in your view controller, define method:

-(void)reloadWebView{
    NSString *urlAddress = @"your-url";
    NSURL *essaUrl = [NSURL URLWithString:urlAddress];
    NSURLRequest *requestObj = [NSURLRequest requestWithURL:essaUrl];
    [self.myWebView loadRequest:requestObj];
}

---

Related Topics