How to detect all touches in Swift 2 - ios

Question

I'm trying to create a timeout function for an app I'm develop using Swift 2 but in swift 2, you can put this code in the app delegate and it works but it does not detect any keyboard presses, button presses, textfield presses, and etc:
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
super.touchesBegan(touches, withEvent: event);
let allTouches = event!.allTouches();
if(allTouches?.count > 0) {
let phase = (allTouches!.first as UITouch!).phase;
if(phase == UITouchPhase.Began || phase == UITouchPhase.Ended) {
//Stuff
timeoutModel.actionPerformed();
}
}
}
Before swift 2, I was able to have the AppDelegate subclass UIApplication and override sendEvent: like this:
-(void)sendEvent:(UIEvent *)event
{
[super sendEvent:event];
// Only want to reset the timer on a Began touch or an Ended touch, to reduce the number of timer resets.
NSSet *allTouches = [event allTouches];
if ([allTouches count] > 0) {
// allTouches count only ever seems to be 1, so anyObject works here.
UITouchPhase phase = ((UITouch *)[allTouches anyObject]).phase;
if (phase == UITouchPhaseBegan || phase == UITouchPhaseEnded)
[[InactivityModel instance] actionPerformed];
}
}
The code above works for every touch but the swift equivalent only works when a view does not exist above that UIWindow's hierarchy?
Does anyone know a way to detect every touch in the application?

Answer 1

As I have something similar in my application, I just tried to fix it:
override sendEvent in UIWindow - doesn't work
override sendEvent in delegate - doesn't work
So the only way is to provide custom UIApplication subclass. My code so far (works on iOS 9) is:
#objc(MyApplication) class MyApplication: UIApplication {
override func sendEvent(event: UIEvent) {
//
// Ignore .Motion and .RemoteControl event
// simply everything else then .Touches
//
if event.type != .Touches {
super.sendEvent(event)
return
}
//
// .Touches only
//
var restartTimer = true
if let touches = event.allTouches() {
//
// At least one touch in progress?
// Do not restart auto lock timer, just invalidate it
//
for touch in touches.enumerate() {
if touch.element.phase != .Cancelled && touch.element.phase != .Ended {
restartTimer = false
break
}
}
}
if restartTimer {
// Touches ended || cancelled, restart auto lock timer
print("Restart auto lock timer")
} else {
// Touch in progress - !ended, !cancelled, just invalidate it
print("Invalidate auto lock timer")
}
super.sendEvent(event)
}
}
Why there's #objc(MyApplication). That's because Swift mangles names in a different way then Objective-C and it just says - my class name in Objective-C is MyApplication.
To make it working, open your info.plist and add row with Principal class key and MyApplication value (MyApplication is what's inside #objc(...), not your Swift class name). Raw key is NSPrincipalClass.

Answer 2

UIWindow also has a sendEvent method that you can override. That would allow you to track the time since the last screen touch. Swift 4:
class IdlingWindow: UIWindow {
/// Tracks the last time this window was interacted with
var lastInteraction = Date.distantPast
override func sendEvent(_ event: UIEvent) {
super.sendEvent(event)
lastInteraction = Date()
}
}
If you're using a storyboard, you can load it in didFinishLaunchingWithOptions:
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: IdlingWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
window = IdlingWindow(frame: UIScreen.main.bounds)
window?.rootViewController = UIStoryboard.init(name: "Main", bundle: nil).instantiateInitialViewController()
window?.makeKeyAndVisible()
return true
}
:
}
extension UIApplication {
/// Conveniently gets the last interaction time
var lastInteraction: Date {
return (keyWindow as? IdlingWindow)?.lastInteraction ?? .distantPast
}
}
Now elsewhere in your app, you can check for inactivity like this:
if UIApplication.shared.lastInteraction.timeIntervalSinceNow < -2 {
// the window has been idle over 2 seconds
}

Answer 3

#markiv answer works like a charm, with two issues:
keyWindow
"'keyWindow' was deprecated in iOS 13.0: Should not be used for applications that support multiple scenes as it returns a key window across all connected scenes"
Can be solved like this:
let kw = UIApplication.shared.windows.filter {$0.isKeyWindow}.first
found here
see answer of #matt
AppDelegate - I get this message:
The app delegate must implement the window property if it wants to use a main storyboard file
One can subclass UIWindow - found the answer here. Combine this with the IdlingWindow class.
Message is gone.
var customWindow: IdlingWindow?
var window: UIWindow? {
get {
customWindow = customWindow ?? IdlingWindow(frame: UIScreen.mainScreen().bounds)
return customWindow
}
set { }
}