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SwiftUI Alert example using enum
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| import SwiftUI | |
| enum Message { | |
| /// A message and OK button | |
| case information(body: String) | |
| /// A message and OK button | |
| case warning(body: String) | |
| /// A question with YES and NO buttons | |
| case confirmation(body: String, action: () -> Void) | |
| /// A question about destractive action with `action` and CANCEL buttons | |
| case destruction(body: String, label: String, action: () -> Void) | |
| } | |
| extension Message: Identifiable { | |
| var id: String { String(reflecting: self) } | |
| } | |
| extension Message { | |
| /// Builder of an Alert | |
| func show() -> Alert { | |
| switch self { | |
| case let .confirmation(body, action): | |
| return Alert( | |
| title: Text("Confirmation"), | |
| message: Text(body), | |
| primaryButton: .default(Text("YES"), action: action), | |
| secondaryButton: .cancel(Text("NO"))) | |
| case let .information(body): | |
| return Alert( | |
| title: Text("Information"), | |
| message: Text(body)) | |
| case let .warning(body): | |
| return Alert( | |
| title: Text("Warning"), | |
| message: Text(body)) | |
| case let .destruction(body, label, action): | |
| return Alert( | |
| title: Text("Confirmation"), | |
| message: Text(body), | |
| primaryButton: .destructive(Text(label), action: action), | |
| secondaryButton: .cancel()) | |
| } | |
| } | |
| } | |
| extension View { | |
| func alert(with message: Binding<Message?>) -> some View { | |
| self.alert(item: message) { $0.show() } | |
| } | |
| } | |
| struct ContentView: View { | |
| var variants: [Message] = [ | |
| .confirmation(body: "Sure?", action: { | |
| print("Confirmed") | |
| }), | |
| .destruction(body: "Are you want to delete files?", label: "DELETE", action: { | |
| print("Deleted") | |
| }), | |
| .warning(body: "You reached the limit!"), | |
| .information(body: "Rest is what your body needs.") | |
| ] | |
| @State var message: Message? = nil | |
| var body: some View { | |
| Button(action: { | |
| self.message = self.variants.randomElement()! | |
| }) { | |
| Text("Let's alert") | |
| } | |
| .alert(with: $message) | |
| } | |
| } |
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