How to check if the view controller is in peek mode [3d touch] or full screen mode in iOS

Question

The detail view controller supports peek mode. when we display the detailed controller in peek mode, we need to disable the tooltips/tutorial in detail controller. How do we identify if the view controller is shown in peek mode or full screen mode?

Answer 1

When you instantiate your view controller in the UIViewControllerPreviewing delegate method, you can set a variable that tells it what context it is in.Then respond accordingly inside of your view controller code.

public func previewingContext(previewingContext: UIViewControllerPreviewing, viewControllerForLocation location: CGPoint) -> UIViewController? {
    //...

    let sb = UIStoryboard(name: "DocumentViewer", bundle: nil)
    guard let detailViewController = 
        sb.instantiateViewControllerWithIdentifier("DocumentViewerViewController") 
        as? DocumentViewerViewController else { return nil }

    detailViewController.isPeeking = true // <--- Set variable here

    // Other stuff here...

    detailViewController.preferredContentSize = CGSize(width: 0.0, height: 380.0)
    previewingContext.sourceRect = cell.frame

    return detailViewController
}

Then, inside of the detail view controller, enable/disable whatever you need.