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Update IOSWebViewManager.cs #4158

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merged 3 commits into from
Jan 25, 2022
Merged

Update IOSWebViewManager.cs #4158

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5b264cf
Update IOSWebViewManager.cs
chenrensong Jan 17, 2022
fa451dd
Apply suggestions from code review
pranavkm Jan 19, 2022
182eb83
Update src/BlazorWebView/src/Maui/iOS/IOSWebViewManager.cs
pranavkm Jan 19, 2022
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112 changes: 110 additions & 2 deletions src/BlazorWebView/src/Maui/iOS/IOSWebViewManager.cs
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Original file line number Diff line number Diff line change
@@ -1,12 +1,13 @@
using System;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.Encodings.Web;
using Foundation;
using Microsoft.AspNetCore.Components.Web;
using Microsoft.Extensions.FileProviders;
using UIKit;
using WebKit;

namespace Microsoft.AspNetCore.Components.WebView.Maui
{
public class IOSWebViewManager : WebViewManager
Expand Down Expand Up @@ -53,6 +54,113 @@ internal void MessageReceivedInternal(Uri uri, string message)
private void InitializeWebView()
{
_webview.NavigationDelegate = new WebViewNavigationDelegate(_blazorMauiWebViewHandler);
_webview.UIDelegate = new WebViewUIDelegate(_blazorMauiWebViewHandler);
}

internal sealed class WebViewUIDelegate : WKUIDelegate
{
private static readonly string LocalOK = NSBundle.FromIdentifier("com.apple.UIKit").GetLocalizedString("OK");
private static readonly string LocalCancel = NSBundle.FromIdentifier("com.apple.UIKit").GetLocalizedString("Cancel");
private readonly BlazorWebViewHandler _webView;

public WebViewUIDelegate(BlazorWebViewHandler webView)
{
_webView = webView ?? throw new ArgumentNullException(nameof(webView));
}


public override void RunJavaScriptAlertPanel(WKWebView webView, string message, WKFrameInfo frame, Action completionHandler)
{
PresentAlertController(
webView,
message,
okAction: _ => completionHandler()
);
}

public override void RunJavaScriptConfirmPanel(WKWebView webView, string message, WKFrameInfo frame, Action<bool> completionHandler)
{
PresentAlertController(
webView,
message,
okAction: _ => completionHandler(true),
cancelAction: _ => completionHandler(false)
);
}

public override void RunJavaScriptTextInputPanel(
WKWebView webView, string prompt, string? defaultText, WKFrameInfo frame, Action<string> completionHandler)
{
PresentAlertController(
webView,
prompt,
defaultText: defaultText,
okAction: x => completionHandler(x.TextFields[0].Text!),
cancelAction: _ => completionHandler(null!)
);
}

private static string GetJsAlertTitle(WKWebView webView)
{
// Emulate the behavior of UIWebView dialogs.
// The scheme and host are used unless local html content is what the webview is displaying,
// in which case the bundle file name is used.
if (webView.Url != null && webView.Url.AbsoluteString != $"file://{NSBundle.MainBundle.BundlePath}/")
return $"{webView.Url.Scheme}://{webView.Url.Host}";

return new NSString(NSBundle.MainBundle.BundlePath).LastPathComponent;
}

private static UIAlertAction AddOkAction(UIAlertController controller, Action handler)
{
var action = UIAlertAction.Create(LocalOK, UIAlertActionStyle.Default, (_) => handler());
controller.AddAction(action);
controller.PreferredAction = action;
return action;
}

private static UIAlertAction AddCancelAction(UIAlertController controller, Action handler)
{
var action = UIAlertAction.Create(LocalCancel, UIAlertActionStyle.Cancel, (_) => handler());
controller.AddAction(action);
return action;
}

private static void PresentAlertController(
WKWebView webView,
string message,
string? defaultText = null,
Action<UIAlertController>? okAction = null,
Action<UIAlertController>? cancelAction = null)
{
var controller = UIAlertController.Create(GetJsAlertTitle(webView), message, UIAlertControllerStyle.Alert);

if (defaultText != null)
controller.AddTextField((textField) => textField.Text = defaultText);

if (okAction != null)
AddOkAction(controller, () => okAction(controller));

if (cancelAction != null)
AddCancelAction(controller, () => cancelAction(controller));

GetTopViewController(UIApplication.SharedApplication.Windows.FirstOrDefault(m => m.IsKeyWindow)?.RootViewController)?
.PresentViewController(controller, true, null);
}

private static UIViewController? GetTopViewController(UIViewController? viewController)
{
if (viewController is UINavigationController navigationController)
return GetTopViewController(navigationController.VisibleViewController);

if (viewController is UITabBarController tabBarController)
return GetTopViewController(tabBarController.SelectedViewController!);

if (viewController?.PresentedViewController != null)
return GetTopViewController(viewController.PresentedViewController);

return viewController;
}
}

internal class WebViewNavigationDelegate : WKNavigationDelegate
Expand Down