79 lines
2.9 KiB
Swift
79 lines
2.9 KiB
Swift
//
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// Copyright 2021-2024 New Vector Ltd.
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//
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// SPDX-License-Identifier: AGPL-3.0-only
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// Please see LICENSE in the repository root for full details.
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//
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import SwiftUI
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/// A type that describes an alert to be shown to the user.
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///
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/// The alert info can be added to the view state bindings and used as an alert's `item`:
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/// ```
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/// MyView
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/// .alert(item: $viewModel.alertInfo) { $0.alert }
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/// ```
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struct AlertInfo<T: Hashable>: Identifiable {
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/// An identifier that can be used to distinguish one error from another.
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let id: T
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/// The alert's title.
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let title: String
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/// The alert's message (optional).
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var message: String?
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/// The alert's primary button title and action. Defaults to an Ok button with no action.
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var primaryButton: (title: String, action: (() -> Void)?) = (VectorL10n.ok, nil)
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/// The alert's secondary button title and action.
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var secondaryButton: (title: String, action: (() -> Void)?)?
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}
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extension AlertInfo {
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/// Initialises the type with the title and message from an `NSError` along with the default Ok button.
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init?(error: NSError? = nil) where T == Int {
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self.init(id: error?.code ?? -1, error: error)
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}
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/// Initialises the type with the title and message from an `NSError` along with the default Ok button.
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/// - Parameters:
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/// - id: An ID that identifies the error.
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/// - error: The Error that occurred.
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init?(id: T, error: NSError? = nil) {
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guard error?.domain != NSURLErrorDomain, error?.code != NSURLErrorCancelled else { return nil }
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self.id = id
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title = error?.userInfo[NSLocalizedFailureReasonErrorKey] as? String ?? VectorL10n.error
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message = error?.userInfo[NSLocalizedDescriptionKey] as? String ?? VectorL10n.errorCommonMessage
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}
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}
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@available(iOS 13.0, *)
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extension AlertInfo {
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private var messageText: Text? {
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guard let message = message else { return nil }
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return Text(message)
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}
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/// Returns a SwiftUI `Alert` created from this alert info, using default button
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/// styles for both primary and (if set) secondary buttons.
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var alert: Alert {
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if let secondaryButton = secondaryButton {
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return Alert(title: Text(title),
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message: messageText,
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primaryButton: alertButton(for: primaryButton),
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secondaryButton: alertButton(for: secondaryButton))
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} else {
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return Alert(title: Text(title),
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message: messageText,
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dismissButton: alertButton(for: primaryButton))
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}
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}
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private func alertButton(for buttonParameters: (title: String, action: (() -> Void)?)) -> Alert.Button {
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guard let action = buttonParameters.action else {
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return .default(Text(buttonParameters.title))
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}
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return .default(Text(buttonParameters.title), action: action)
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}
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}
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