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Restore old Alert/ActionSheet method for iOS 8 #595

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merged 2 commits into from Dec 2, 2016
Merged

Restore old Alert/ActionSheet method for iOS 8 #595

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e4893cb
Rename action sheet overload
hartez Nov 30, 2016
3da6833
Restoring iOS8-compatible alert/actionsheet handling
hartez Nov 30, 2016
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130 changes: 102 additions & 28 deletions Xamarin.Forms.Platform.iOS/Platform.cs
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Expand Up @@ -46,20 +46,17 @@ internal Platform()
if (!PageIsChildOfPlatform(sender))
return;

if (Forms.IsiOS8OrNewer)
if (Forms.IsiOS9OrNewer)
{
PresentAlert(arguments);
}
else if (Forms.IsiOS8OrNewer)
{
Present8Alert(arguments);
}
else
{
UIAlertView alertView;
if (arguments.Accept != null)
alertView = new UIAlertView(arguments.Title, arguments.Message, null, arguments.Cancel, arguments.Accept);
else
alertView = new UIAlertView(arguments.Title, arguments.Message, null, arguments.Cancel);

alertView.Dismissed += (o, args) => arguments.SetResult(args.ButtonIndex != 0);
alertView.Show();
PresentPre8Alert(arguments);
}
});

Expand All @@ -73,25 +70,17 @@ internal Platform()
pageRoot = (Page)pageRoot.RealParent;
var pageRenderer = GetRenderer(pageRoot);

if (Forms.IsiOS8OrNewer)
if (Forms.IsiOS9OrNewer)
{
PresentAlert(arguments);
PresentActionSheet(arguments);
}
else if (Forms.IsiOS8OrNewer)
{
Present8ActionSheet(arguments, pageRenderer);
}
else
{
var actionSheet = new UIActionSheet(arguments.Title, null, arguments.Cancel, arguments.Destruction, arguments.Buttons.ToArray());

actionSheet.ShowInView(pageRenderer.NativeView);

actionSheet.Clicked += (o, args) =>
{
string title = null;
if (args.ButtonIndex != -1)
title = actionSheet.ButtonTitle(args.ButtonIndex);

// iOS 8 always calls WillDismiss twice, once with the real result, and again with -1.
arguments.Result.TrySetResult(title);
};
PresentPre8ActionSheet(arguments, pageRenderer);
}
});
}
Expand Down Expand Up @@ -416,10 +405,10 @@ void PresentAlert(AlertArguments arguments)
() => arguments.SetResult(true), window));
}

PresentAlert(window, alert);
PresentPopUp(window, alert);
}

void PresentAlert(ActionSheetArguments arguments)
void PresentActionSheet(ActionSheetArguments arguments)
{
var alert = UIAlertController.Create(arguments.Title, null, UIAlertControllerStyle.ActionSheet);
var window = new UIWindow { BackgroundColor = Color.Transparent.ToUIColor() };
Expand All @@ -444,10 +433,10 @@ void PresentAlert(ActionSheetArguments arguments)
alert.AddAction(CreateActionWithWindowHide(blabel, UIAlertActionStyle.Default, () => arguments.SetResult(blabel), window));
}

PresentAlert(window, alert, arguments);
PresentPopUp(window, alert, arguments);
}

static void PresentAlert(UIWindow window, UIAlertController alert, ActionSheetArguments arguments = null)
static void PresentPopUp(UIWindow window, UIAlertController alert, ActionSheetArguments arguments = null)
{
window.RootViewController = new UIViewController();
window.RootViewController.View.BackgroundColor = Color.Transparent.ToUIColor();
Expand Down Expand Up @@ -504,6 +493,91 @@ async Task PresentModal(Page modal, bool animated)
await Task.Delay(5);
}

void PresentPre8Alert(AlertArguments arguments)
{
UIAlertView alertView;
if (arguments.Accept != null)
alertView = new UIAlertView(arguments.Title, arguments.Message, null, arguments.Cancel, arguments.Accept);
else
alertView = new UIAlertView(arguments.Title, arguments.Message, null, arguments.Cancel);

alertView.Dismissed += (o, args) => arguments.SetResult(args.ButtonIndex != 0);
alertView.Show();
}

void PresentPre8ActionSheet(ActionSheetArguments arguments, IVisualElementRenderer pageRenderer)
{
var actionSheet = new UIActionSheet(arguments.Title, null, arguments.Cancel, arguments.Destruction,
arguments.Buttons.ToArray());

actionSheet.ShowInView(pageRenderer.NativeView);

actionSheet.Clicked += (o, args) =>
{
string title = null;
if (args.ButtonIndex != -1)
title = actionSheet.ButtonTitle(args.ButtonIndex);

arguments.Result.TrySetResult(title);
};
}

void Present8Alert(AlertArguments arguments)
{
var alert = UIAlertController.Create(arguments.Title, arguments.Message, UIAlertControllerStyle.Alert);
var oldFrame = alert.View.Frame;
alert.View.Frame = new RectangleF(oldFrame.X, oldFrame.Y, oldFrame.Width, oldFrame.Height - _alertPadding * 2);
alert.AddAction(UIAlertAction.Create(arguments.Cancel, UIAlertActionStyle.Cancel, a => arguments.SetResult(false)));
if (arguments.Accept != null)
alert.AddAction(UIAlertAction.Create(arguments.Accept, UIAlertActionStyle.Default, a => arguments.SetResult(true)));
var page = _modals.Any() ? _modals.Last() : Page;
var vc = GetRenderer(page).ViewController;
vc.PresentViewController(alert, true, null);
}

void Present8ActionSheet(ActionSheetArguments arguments, IVisualElementRenderer pageRenderer)
{
var alert = UIAlertController.Create(arguments.Title, null, UIAlertControllerStyle.ActionSheet);

if (arguments.Cancel != null)
{
alert.AddAction(UIAlertAction.Create(arguments.Cancel, UIAlertActionStyle.Cancel, a => arguments.SetResult(arguments.Cancel)));
}

if (arguments.Destruction != null)
{
alert.AddAction(UIAlertAction.Create(arguments.Destruction, UIAlertActionStyle.Destructive, a => arguments.SetResult(arguments.Destruction)));
}

foreach (var label in arguments.Buttons)
{
if (label == null)
continue;

var blabel = label;
alert.AddAction(UIAlertAction.Create(blabel, UIAlertActionStyle.Default, a => arguments.SetResult(blabel)));
}

if (UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Pad)
{
UIDevice.CurrentDevice.BeginGeneratingDeviceOrientationNotifications();
var observer = NSNotificationCenter.DefaultCenter.AddObserver(UIDevice.OrientationDidChangeNotification,
n => { alert.PopoverPresentationController.SourceRect = pageRenderer.ViewController.View.Bounds; });

arguments.Result.Task.ContinueWith(t =>
{
NSNotificationCenter.DefaultCenter.RemoveObserver(observer);
UIDevice.CurrentDevice.EndGeneratingDeviceOrientationNotifications();
}, TaskScheduler.FromCurrentSynchronizationContext());

alert.PopoverPresentationController.SourceView = pageRenderer.ViewController.View;
alert.PopoverPresentationController.SourceRect = pageRenderer.ViewController.View.Bounds;
alert.PopoverPresentationController.PermittedArrowDirections = 0; // No arrow
}

pageRenderer.ViewController.PresentViewController(alert, true, null);
}

internal class DefaultRenderer : VisualElementRenderer<VisualElement>
{
}
Expand Down