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* Bump demo app to iOS 14 * Convert error view to SwiftUI * Move ErrorPresenter in and make delegate optional * reload -> retry * Make ErrorPresenter public * Document error handling * [skip ci] Update CHANGELOG
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| import SwiftUI | ||
| import UIKit | ||
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| public protocol ErrorPresenter: UIViewController { | ||
| typealias Handler = () -> Void | ||
|
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| func presentError(_ error: Error, handler: @escaping Handler) | ||
| } | ||
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| public extension ErrorPresenter { | ||
| func presentError(_ error: Error, handler: @escaping () -> Void) { | ||
| let errorView = ErrorView(error: error) { [unowned self] in | ||
| handler() | ||
| self.removeErrorViewController() | ||
| } | ||
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| let controller = UIHostingController(rootView: errorView) | ||
| addChild(controller) | ||
| addFullScreenSubview(controller.view) | ||
| controller.didMove(toParent: self) | ||
| } | ||
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| private func removeErrorViewController() { | ||
| if let child = children.first(where: { $0 is UIHostingController<ErrorView> }) { | ||
| child.willMove(toParent: nil) | ||
| child.view.removeFromSuperview() | ||
| child.removeFromParent() | ||
| } | ||
| } | ||
| } | ||
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| extension UIViewController: ErrorPresenter {} | ||
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| // MARK: Private | ||
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| private struct ErrorView: View { | ||
| let error: Error | ||
| let handler: ErrorPresenter.Handler? | ||
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| var body: some View { | ||
| VStack(spacing: 16) { | ||
| Image(systemName: "exclamationmark.triangle") | ||
| .font(.system(size: 38, weight: .semibold)) | ||
| .foregroundColor(.accentColor) | ||
|
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| Text("Error loading page") | ||
| .font(.largeTitle) | ||
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| Text(error.localizedDescription) | ||
| .font(.body) | ||
| .multilineTextAlignment(.center) | ||
|
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| Button("Retry") { | ||
| handler?() | ||
| } | ||
| .font(.system(size: 17, weight: .bold)) | ||
| } | ||
| .padding(32) | ||
| } | ||
| } | ||
|
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| private struct ErrorView_Previews: PreviewProvider { | ||
| static var previews: some View { | ||
| return ErrorView(error: NSError( | ||
| domain: "com.example.error", | ||
| code: 1001, | ||
| userInfo: [NSLocalizedDescriptionKey: "Could not connect to the server."] | ||
| )) {} | ||
| } | ||
| } | ||
|
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| private extension UIViewController { | ||
| func addFullScreenSubview(_ subview: UIView) { | ||
| view.addSubview(subview) | ||
| subview.translatesAutoresizingMaskIntoConstraints = false | ||
| NSLayoutConstraint.activate([ | ||
| subview.leadingAnchor.constraint(equalTo: view.leadingAnchor), | ||
| subview.trailingAnchor.constraint(equalTo: view.trailingAnchor), | ||
| subview.topAnchor.constraint(equalTo: view.topAnchor), | ||
| subview.bottomAnchor.constraint(equalTo: view.bottomAnchor) | ||
| ]) | ||
| } | ||
| } |
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