XRay

XRay is view debugging tool for iOS. Currently, XRay can show all of the view hierarchies in UIKit. For SwiftUI, I'm working on it.

XRay helps you debugging view without using XCode's Debug View Hierarchy

Demo

XRay.mp4

How to Use

Use XRay in Debug mode only. I don't recommend using it with Swizzling function.

1. Add XRay in your project

2. Set ScreenShot Notification (AppDelegate.swift)

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
    #if DEBUG
        NotificationCenter.default.addObserver(
            self, selector: #selector(screenshotTaken),
            name: UIApplication.userDidTakeScreenshotNotification, object: nil
        )
    #endif
        return true
    }

    #if DEBUG
    @objc func screenshotTaken() {
        guard let scene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
                let keyWindow = scene.keyWindow,
                let topViewController = keyWindow.topViewController() else {
            return
        }
        let xray = XRay(rootViewController: topViewController)
        xray.captureXray(classNameOption: .all)
        DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(5)) {
            xray.removeXray()
        }
    }
    #endif

ClassNameOption

func captureXray(classNameOption: ClassNameOption)

Labels

• Red Label(Center): ViewController
• Blue Label(trailing bottom): Custom View
• Black Label(leading top): View

ClassNameOption.all

This option shows all of the view hierarchies.

ClassNameOption.customClass

This option shows custom view only

Reference

• https://stackoverflow.com/questions/6131205/how-to-find-topmost-view-controller-on-ios
• https://en.wikipedia.org/wiki/Complementary_colors
• https://gist.github.com/klein-artur/025a0fa4f167a648d9ea
• https://stackoverflow.com/questions/2746478/how-can-i-loop-through-all-subviews-of-a-uiview-and-their-subviews-and-their-su