Detecting when an app is active or inactive through touches in Swift [duplicate]

Answer 1

A way to intercept any touches of your application is to create a custom UIWindow which will catch the touches without canceling them.

class CustomWindow: UIWindow {

    override func pointInside(point: CGPoint, withEvent event: UIEvent?) -> Bool {
        // Do any action you would like to perform to indicate the application is active
        return false
    }

}

You have to add this window in your Application Delegate, and set its level above the main window.

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var topWindow: CustomWindow?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool
    {
        topWindow = CustomWindow(frame: UIScreen.mainScreen().bounds)
        topWindow?.rootViewController = UIViewController()
        topWindow?.windowLevel = UIWindowLevelNormal + 1
        topWindow?.hidden = false
        return true
    }