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Update Focus demo to use bind helper #2472

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Sep 20, 2023
Merged

Update Focus demo to use bind helper #2472

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19 changes: 5 additions & 14 deletions Examples/CaseStudies/SwiftUICaseStudies/01-GettingStarted-FocusState.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,9 @@ import ComposableArchitecture
import SwiftUI

private let readMe = """
This demonstrates how to make use of SwiftUI's `@FocusState` in the Composable Architecture. \
If you tap the "Sign in" button while a field is empty, the focus will be changed to that field.
This demonstrates how to make use of SwiftUI's `@FocusState` in the Composable Architecture with \
the library's `bind` view modifier. If you tap the "Sign in" button while a field is empty, the \
focus will be changed to that field.
"""

// MARK: - Feature domain
Expand Down Expand Up @@ -66,23 +67,13 @@ struct FocusDemoView: View {
}
.textFieldStyle(.roundedBorder)
}
.synchronize(viewStore.$focusedField, self.$focusedField)
// Synchronize store focus state and local focus state.
.bind(viewStore.$focusedField, to: self.$focusedField)
}
.navigationTitle("Focus demo")
}
}

extension View {
func synchronize<Value>(
_ first: Binding<Value>,
_ second: FocusState<Value>.Binding
) -> some View {
self
.onChange(of: first.wrappedValue) { second.wrappedValue = $0 }
.onChange(of: second.wrappedValue) { first.wrappedValue = $0 }
}
}

// MARK: - SwiftUI previews

struct FocusDemo_Previews: PreviewProvider {
Expand Down