Question 1

How do I set up Vaccine with InjectionIII in Xcode?

Accepted Answer

Install InjectionIII from the Mac App Store, add Vaccine via CocoaPods or Carthage, then load the injection bundle in your AppDelegate and add observers to view controllers, as shown in the README's example project steps.

Question 2

Does Vaccine work with SwiftUI or only UIKit?

Accepted Answer

Vaccine is designed for UIKit and AppKit, not SwiftUI. It relies on view controller and view lifecycle methods that aren't present in SwiftUI's declarative framework, so it's not compatible out-of-the-box.

Question 3

Vaccine vs manual InjectionIII setup: which is better?

Accepted Answer

Vaccine reduces boilerplate by providing pre-built extensions and automation like swizzling, making setup faster. However, manual setup offers more control, especially if you want to avoid swizzling or have custom injection logic.

Question 4

Can I use Vaccine for hot reloading on iOS devices?

Accepted Answer

No, Vaccine and InjectionIII only work in the simulator. The README clearly states that code injection has no effect on physical devices due to runtime and security constraints.

Question 5

How to disable swizzling in Vaccine?

Accepted Answer

When loading the injection bundle, set the 'swizzling' parameter to false, as shown in the code snippet: Injection.load(then: ..., swizzling: false). This requires manual observer addition in views and controllers.

Question 6

What are the limitations of Vaccine for code injection?

Accepted Answer

Limitations include simulator-only operation, potential issues with state persistence after injection, and scenarios requiring full recompiles, as noted in the description where some changes won't appear without rebuilding.

Question 7

How does Vaccine handle Auto Layout constraints during injection?

Accepted Answer

With swizzling enabled, Vaccine automatically deactivates old constraints to avoid conflicts. Alternatively, you can manually manage constraints using a layoutConstraints array, as detailed in the Auto layout constraints section.

Vaccine

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