How do I open a Viewcontroller via Local Notification?

Question

I have an application that sends notifications to the user from time to time, but how do I open a View without being the main View, when the user clicks on the notification?

Example, Whatsapp conversations, Messenger notifications, ie open specific screens through notification.

I am using Local Notification and not Remote Notification(Push).

I would like a simple example that doesn’t necessarily need an internet connection.

Answer 1

In the iOS you don’t open a view directly (as can be done in Android) and yes the application is opened to then open the screen you want. This is all done in your Appdelegate, sort of like this:

In the application:didFinishLaunchingWithOptions:, which is where the lifecycle of your application starts as soon as it is opened by pressing the notification, you will have this:

if let options: NSDictionary = launchOptions {
    var localNotification = options.objectForKey(UIApplicationLaunchOptionsLocalNotificationKey) as? NSDictionary

    if localNotification != nil {
        handleLocalNotification(application, userInfo: localNotification!)
    }
}

This indicates that your application is being opened through notification and has been terminated before, so you will receive this key that exists on launchOptions.

The method handleLocalNotification is what will perform the functions you want with the notification information:

func handleLocalNotification(application: UIApplication, userInfo: NSDictionary?) {
    window?.rootViewController = viewController
}

Here, you have the variable userInfo with information from your notification (if anything) and viewController is your view, that its startup will depend on how you are doing your project, is something similar to what you should have already implemented.

And the implementation of delegate didReceiveLocalNotification, if it has not been closed and submits to the same method we created above:

func application(application: UIApplication, didReceiveLocalNotification notification: UILocalNotification) {
    handleLocalNotification(application, userInfo: notification.userInfo)
}