swiftui-debug

SwiftUI Debugging Guide

Debug common SwiftUI issues in the Leavn app:

Common Issues

1. View Not Updating

Check:

• Is ViewModel using @Observable macro?
• Are properties marked @MainActor if needed?
• Is view observing the right object?

Fix:

// Ensure ViewModel is @Observable
@Observable
class MyViewModel {
    var state: String = ""  // Auto-tracked
}

// Ensure view observes it @State var viewModel = MyViewModel() // Not @StateObject

### 2. Binding Not Working
**Check:**
- Is the binding two-way?
- Is the source value actually mutable?
- Is there a `@Binding` vs `@State` mismatch?

**Fix:**
```swift
// Correct binding chain
@State var value: String
TextField("", text: $value)  // $ creates Binding

3. Modal/Sheet Won't Dismiss

Check:

• Is @Environment(\.dismiss) being called?
• Is isPresented binding being set to false?
• Are there multiple presentation modifiers conflicting?

Fix:

@Environment(\.dismiss) var dismiss

Button("Close") {
    isPresented = false  // Update binding
    dismiss()  // Call environment dismiss
}

4. Performance Issues

Check:

• Are views too complex? (use Self._printChanges())
• Unnecessary re-renders?
• Heavy computations in body?

Fix:

• Extract subviews
• Use @State sparingly
• Move logic to ViewModel

Return specific fixes for the reported SwiftUI issue.