In Swift, how to get the device orientation correctly right after it's launched?

Question

I use following code to see if the device is in landscape mode or not:

UIDevice.currentDevice().orientation.isLandscape.boolValue

It works

Answer 1

The isValidInterfaceOrientation should be detected before checking the orientation isLandscape. Don't process the flat message with isValidInterfaceOrientation == false (when it has any value of isLandscape).

I had a hazzel with this until I read the topic more carefully. With consideration of the isValidInterfaceOrientation it works fine.

@objc func rotated() {
    if (UIDevice.current.orientation.isValidInterfaceOrientation) {
        if (UIDevice.current.orientation.isLandscape) { 
            if(!bLandscape) {
                bLandscape = true
                setupTabBar() // Repaint the app
            }
        } else { // Portait 
            if(bLandscape) {
                bLandscape = false
                setupTabBar() // Repaint the app 
            }
        }
    }
}