Ios9: Alternative to Uidevice.Currentdevice().Setvalue(...) to Force Orientation

Fix Orientation and list for changes - SWIFT

Shawn, thanks for the advice. In the end, that's what I did. Here's my code

You'll also need to import CoreMotion

    var motion = CMMotionManager()
    var currentOrientation: String = "Portrait"
    
    func oritentationUpdateStart() {
        motion.accelerometerUpdateInterval = 1.0
        motion.startAccelerometerUpdates(to: OperationQueue.current! ) { (data, error) in
            if let accel = data {
                if (accel.acceleration.x > 0.5){
                    self.currentOrientation = "Upsidedown Landscape"
                }
                else if (accel.acceleration.y > 0.5) {
                    self.currentOrientation = "Upsidedown Portrait"
                }
                else if (accel.acceleration.x < -0.5) {
                    self.currentOrientation = "Landscape"
                }
                else if (accel.acceleration.y < -0.5) {
                    self.currentOrientation = "Portrait"
                }
            }
        }
    }

Better way than using a var outside a func to track device orientation?

After considerable research and testing, I found that the most reliable way to do this (AFAIK) was to keep the global var but to use the CGSize that is being passed as a means of testing. It's immediately available whereas orientation might not yet be set. Quickly rotating or flipping the device would cause errors with the latter. I was not able to trigger an error when using size as shown here:

var previousSize = CGSize(width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)

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

    if size == previousSize {return}
    else{ previousSize = size}

    let aspectRatio = Float(size.height/size.width)

    mapViewC.height = mapViewC.height / aspectRatio
}

cannot force app to portrait-only in iOS9

Please check Info.plist for "Supported interface orientations".
It must show Portrait for your requirement. Sometimes it is not updated as project settings in General Tab. If you find landscape orientation over here then remove it.

<key>UISupportedInterfaceOrientations</key>
<array>
    <string>UIInterfaceOrientationPortrait</string>
</array>

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