About the callback of SKStoreReviewController.requestReview() - swift

Question

If the review popup initiated from a view controller shows up, there isn't a way to switch the window focus back to the view controller when the popup is dismissed due to lack of callback function of SKStoreReviewController.requestReview().
I would like to make a call to becomeFirstResponder() when the review popup is dismissed. Any idea?
Is there a way to extend the SKStoreReviewController and add a callback somehow?

Answer 1

Warning this will probably break at some point.
Step 1: add this code to your didFinishLaunchingWithOptions
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
let windowClass: AnyClass = UIWindow.self
let originalSelector: Selector = #selector(setter: UIWindow.windowLevel)
let swizzledSelector: Selector = #selector(UIWindow.setWindowLevel_startMonitor(_:))
let originalMethod = class_getInstanceMethod(windowClass, originalSelector)
let swizzledMethod = class_getInstanceMethod(windowClass, swizzledSelector)
let didAddMethod = class_addMethod(windowClass, originalSelector, method_getImplementation(swizzledMethod!), method_getTypeEncoding(swizzledMethod!))
if didAddMethod {
class_replaceMethod(windowClass, swizzledSelector, method_getImplementation(originalMethod!), method_getTypeEncoding(originalMethod!))
} else {
method_exchangeImplementations(originalMethod!, swizzledMethod!)
}
return true
}
Step 2: add this class
class MonitorObject: NSObject {
weak var owner: UIWindow?
init(_ owner: UIWindow?) {
super.init()
self.owner = owner
NotificationCenter.default.post(name: UIWindow.didBecomeVisibleNotification, object: self)
}
deinit {
NotificationCenter.default.post(name: UIWindow.didBecomeHiddenNotification, object: self)
}
}
Step 3: Add this UIWindow extension
private var monitorObjectKey = "monitorKey"
private var partialDescForStoreReviewWindow = "SKStore"
extension UIWindow {
// MARK: - Method Swizzling
#objc func setWindowLevel_startMonitor(_ level: Int) {
setWindowLevel_startMonitor(level)
if description.contains(partialDescForStoreReviewWindow) {
let monObj = MonitorObject(self)
objc_setAssociatedObject(self, &monitorObjectKey, monObj, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
}
Step 4: add this to ViewDidLoad of your controller where you want this
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
NotificationCenter.default.addObserver(self, selector: #selector(windowDidBecomeHiddenNotification(_:)), name: UIWindow.didBecomeHiddenNotification, object: nil)
}
Step 5: add the callback for the notification and check that the associated object is a match
#objc func windowDidBecomeHiddenNotification(_ notification: Notification?) {
if notification?.object is MonitorObject {
print("hello")
}
}
Now when a review dialog is closed the notification is triggered and 'print("hello") will be called.

Answer 2

Sometimes iOS app is losing the responder chain, like in the above example of showing StoreKit prompt. What we can do is to detect such events in UIApplication.sendAction and reactivate the first responder chain via becomeFirstResponder. UIKit will reestablish the first responder chain and we can resend the same event.
class MyApplication: UIApplication {
func reactivateResponderChainWhenFirstResponderEventWasNotHandled() {
becomeFirstResponder()
}
override func sendAction(_ action: Selector, to target: Any?, from sender: Any?, for event: UIEvent?) -> Bool {
let wasHandled = super.sendAction(action, to: target, from: sender, for: event)
if wasHandled == false, target == nil {
reactivateResponderChainWhenFirstResponderEventWasNotHandled()
return super.sendAction(action, to: target, from: sender, for: event)
}
return wasHandled
}
}
This works for me on iOS 13 and does not require any private API access.