HotReloading: Crashing on injecting to device

App crashes immediately after hitting save. Its a swift project based on UIKit running on a iOS device.

🔥 HotReloading connected /Users/denilct/Documents/Sharechat/HotReload/HotReload.xcodeproj
🔥 Watching files under the directory /Users/denilct/Documents/Sharechat/HotReload
🔥 💉 ⚠️ Your project file seems to be in the Desktop or Documents folder and may prevent InjectionIII working as it has special permissions.
🔥 Compiling /Users/denilct/Documents/Sharechat/HotReload/HotReload/ViewController.swift
🔥 Loaded .dylib - Ignore any duplicate class warning ⬆️
🔥 Interposed 2 function references.
🔥 ⚠️ Number of class refs 2 does not equal []
🔥 Injected type #1 'HotReload.ViewController'
objc[1025]: Attempt to use unknown class 0x109db0340.

import UIKit

class ViewController: UIViewController {
    let label = UILabel(frame: CGRect(x: 30, y: 200, width: 200, height: 150))

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .red
        view.addSubview(label)
        label.text = "hello"
        // Do any additional setup after loading the view.
    }
    
    
    @objc func injected() {
        view.backgroundColor = UIColor.yellow
        label.text = "anyoooo"
        label.backgroundColor = .red
        view.layoutIfNeeded()
    }
}

Same code works fine for simulator, but crashes on device on hitting save.

About this issue

Original URL
State: closed
Created 2 years ago
Comments: 21 (11 by maintainers)

Most upvoted comments

It was probably fair enough as a security measure to make a blanket ban on the possibility of code modification on a device after review. The change was made in iOS 10. Device injection works as some other protections are relaxed provided you are debugging an app, see: https://github.com/johnno1962/InjectionScratch/blob/main/Sources/InjectionScratch/InjectionLoader.mm.

johnno1962 on Nov 1, 2022