How to Detect Fullscreen Mode Using Avplayerviewcontroller in Swift

How to detect fullscreen mode using AVPlayerViewController in Swift?

Updated for Swift 3:

Add an observer for the playerViewController object:

playerViewController(self, forKeyPath: "videoBounds", options: NSKeyValueObservingOptions.new, context: nil)

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?)
{
    if keyPath == "videoBounds"
    {
        if let rect = change?[.newKey] as? NSValue
        {
            if let newrect = rect.cgRectValue as CGRect?
            {
                // 200 is height of playerViewController in normal screen mode
                if newrect.size.height <= 200
                {
                    print("normal screen")
                }
                else
                {
                    print("full screen")
                }
            }
        }
    }
}

Handle when AVPlayerViewController goes full screen

The answer is here suggesting to observe the videoBounds of the AVPlayerViewController that I initially observed but did not work for me.

This solution is not always working. The notification related to the videoBounds property of the AVPlayerViewController controller is not always issued.

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