Swift - How to detect orientation changes

Question

I want to add two images to single image view (i.e for landscape one image and for portrait another image)but i don\'t know how to detect orientation changes using swift lan

Answer 1

To get the correct orientation on app start you have to check it in viewDidLayoutSubviews(). Other methods described here won't work.

Here's an example how to do it:

var mFirstStart = true

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    if (mFirstStart) {
        mFirstStart = false
        detectOrientation()
    }
}

func detectOrientation() {
    if UIDevice.current.orientation.isLandscape {
        print("Landscape")
        // do your stuff here for landscape
    } else {
        print("Portrait")
        // do your stuff here for portrait
    }
}

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    detectOrientation()
}

This will work always, on app first start, and if rotating while the app is running.