public async override void RowSelected(UITableView tableView, Foundation.NSIndexPath indexPath)
{
// Loading indicator
var loadingOverlay = new LoadingOverlay(Container.View.Bounds);
Container.View.Add(loadingOverlay);
IList <Screen> screens = null;
try
{
screens = (await LessonUtil.GetScreensByLessonAsync(Items[indexPath.Row].Id));
}
catch (Exception e)
{
var alert = UIAlertController.Create("Something goes wrong", String.Format("Please check your Internet connection and try again.{0} Details: {1}", Environment.NewLine, e.Message), UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
Container.PresentViewController(alert, true, null);
}
loadingOverlay.HideThenRemove();
if ((screens != null) && (screens.Count > 0))
{
Container.NavigationController.PushViewController(new LessonScreenViewController(Items[indexPath.Row].Id, screens, 0, new List <ScreenAnswer>()), true);
}
else
{
var alert = UIAlertController.Create("Oops!", "There is nothing in this lesson.", UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
Container.PresentViewController(alert, true, null);
}
tableView.DeselectRow(indexPath, true);
}
public async override void RowSelected(UITableView tableView, Foundation.NSIndexPath indexPath)
{
// Loading indicator
var loadingOverlay = new LoadingOverlay(Container.View.Bounds);
Container.View.Add(loadingOverlay);
IList <Lesson> lessons = null;
try
{
lessons = await LessonUtil.GetLessonsByModuleAsync(Items[indexPath.Row].Id);
}
catch (Exception e)
{
var alert = UIAlertController.Create("Something goes wrong", e.Message, UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
Container.PresentViewController(alert, true, null);
}
loadingOverlay.HideThenRemove();
if ((lessons != null) && (lessons.Count > 0))
{
Container.NavigationController.PushViewController(new LessonsViewController(lessons, Items[indexPath.Row].Name), true);
}
else
{
var alert = UIAlertController.Create("Oops!", "There is nothing in this module", UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
Container.PresentViewController(alert, true, null);
}
tableView.DeselectRow(indexPath, true);
}
public async override void ViewDidLoad()
{
base.ViewDidLoad();
View.BackgroundColor = UIColor.White;
var modulesTable = new UITableView();
View.AddSubview(modulesTable);
View.ConstrainLayout(() =>
modulesTable.Frame.Top == View.Frame.Top &&
modulesTable.Frame.Left == View.Frame.Left &&
modulesTable.Frame.Right == View.Frame.Right &&
modulesTable.Frame.Bottom == View.Frame.Bottom
);
// Loading indicator
var loadingOverlay = new LoadingOverlay(View.Bounds);
View.AddSubview(loadingOverlay);
try
{
Modules = await LessonUtil.GetModulesAsync();
}
catch (Exception e)
{
var alert = UIAlertController.Create("Something goes wrong", e.Message, UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alert, true, null);
}
if (Modules != null)
{
modulesTable.Source = new ModulesTableSource(this, Modules);
modulesTable.ReloadData();
}
loadingOverlay.HideThenRemove();
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
#region Navigation Bar Buttons
if (Index < Screens.Count - 1)
{
NavigationItem.SetRightBarButtonItem(new UIBarButtonItem("Next", UIBarButtonItemStyle.Plain, async(sender, e) =>
{
if (SelectedOptionId != Constants.DefaultOptionId)
{
// Workaround for not having current user in database
User currentUser = null;
try
{
currentUser = await UserUtil.GetCurrentUserAsync();
}
catch
{
var alert = UIAlertController.Create("Something goes wrong", "Please check your Internet connection and try again.", UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alert, true, null);
}
if (currentUser == null)
{
var alert = UIAlertController.Create("Something goes wrong", "Please check your Internet connection, sign out and try again.", UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alert, true, null);
}
else
{
Answers.RemoveAll(x => x.ScreenId == Screens[Index].Id);
Answers.Add(new ScreenAnswer
{
// UserId = UserUtil.CurrentUser.Id.GetValueOrDefault(),
UserId = currentUser.Id.GetValueOrDefault(),
ScreenId = Screens[Index].Id,
OptionId = SelectedOptionId,
});
}
}
PushNextScreen();
}), true);
}
else
{
NavigationItem.SetRightBarButtonItem(new UIBarButtonItem("Submit", UIBarButtonItemStyle.Plain, async(sender, e) =>
{
#region Add Answer
if (SelectedOptionId != Constants.DefaultOptionId)
{
// Workaround for not having current user in database
User currentUser = null;
try
{
currentUser = await UserUtil.GetCurrentUserAsync();
}
catch
{
var alert = UIAlertController.Create("Something goes wrong", String.Format("Please check your Internet connection and try again."), UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alert, true, null);
}
if (currentUser == null)
{
var alert = UIAlertController.Create("Something goes wrong", String.Format("Please check your Internet connection and try again."), UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alert, true, null);
}
else
{
Answers.RemoveAll(x => x.ScreenId == Screens[Index].Id);
Answers.Add(new ScreenAnswer
{
// UserId = UserUtil.CurrentUser.Id.GetValueOrDefault(),
UserId = currentUser.Id.GetValueOrDefault(),
ScreenId = Screens[Index].Id,
OptionId = SelectedOptionId,
});
}
}
#endregion
#region Send Answers to server
if ((Answers != null) && (Answers.Count > 0))
{
var loadingOverlay = new LoadingOverlay(View.Bounds);
Tuple <string, int, int> response = null;
try
{
View.Add(loadingOverlay);
response = await LessonUtil.SendLessonAnswers(LessonId, Answers);
}
catch (Exception ex)
{
var alert = UIAlertController.Create("Something goes wrong", ex.Message, UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alert, true, null);
}
finally
{
loadingOverlay.HideThenRemove();
}
if (response != null)
{
var alertTitle = response.Item1;
var alertMessage = String.Format("Your result: {0}/{1}", response.Item3, response.Item2);
var submissionAlert = UIAlertController.Create(alertTitle, alertMessage, UIAlertControllerStyle.Alert);
submissionAlert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, (UIAlertAction obj) =>
{
NavigationController.PopToRootViewController(true);
}));
PresentViewController(submissionAlert, true, null);
}
}
else
{
var alert = UIAlertController.Create("Nothing to submit", "You haven't selected any answer", UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alert, true, null);
}
#endregion
}), true);
}
#endregion
View.BackgroundColor = UIColor.White;
var scrollView = new UIScrollView();
View.AddSubview(scrollView);
View.ConstrainLayout(() =>
scrollView.Frame.Top == View.Frame.Top &&
scrollView.Frame.Left == View.Frame.Left &&
scrollView.Frame.Right == View.Frame.Right &&
scrollView.Frame.Bottom == View.Frame.Bottom
);
var stackView = new UIStackView
{
Axis = UILayoutConstraintAxis.Vertical,
Alignment = UIStackViewAlignment.Leading,
Distribution = UIStackViewDistribution.EqualSpacing,
Spacing = Constants.BigGap,
};
scrollView.AddSubview(stackView);
var twiceHorizontalPad = Constants.HorizontalPad * 2;
View.ConstrainLayout(() =>
stackView.Frame.Top == scrollView.Frame.Top + Constants.VerticalPad &&
stackView.Frame.Bottom == scrollView.Frame.Bottom - Constants.VerticalPad &&
stackView.Frame.Left == scrollView.Frame.Left + Constants.HorizontalPad &&
stackView.Frame.Right == scrollView.Frame.Right + Constants.HorizontalPad &&
stackView.Frame.Width == scrollView.Frame.Width - twiceHorizontalPad // required!
);
scrollView.ContentSize = stackView.Frame.Size;
var mediaPlayerUrl = !String.IsNullOrWhiteSpace(Screens[Index].VideoUrl) ? Screens[Index].VideoUrl : Screens[Index].AudioUrl;
if (!String.IsNullOrWhiteSpace(mediaPlayerUrl))
{
try
{
MediaPlayer = new AVPlayer(NSUrl.FromString(mediaPlayerUrl));
}
catch (Exception ex)
{
// Display error or skip this part !!
// throw ex;
var alert = UIAlertController.Create("Something goes wrong", "Invalid format for video or audio data", UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alert, true, null);
}
var playerViewController = new AVPlayerViewController
{
Player = MediaPlayer,
};
AddChildViewController(playerViewController);
stackView.AddArrangedSubview(playerViewController.View);
View.ConstrainLayout(() =>
playerViewController.View.Frame.Width == stackView.Frame.Width
);
if (String.IsNullOrWhiteSpace(Screens[Index].VideoUrl))
{
View.ConstrainLayout(() =>
playerViewController.View.Frame.Height == Constants.AudioPlayerHeight
);
}
}
if (Screens[Index].Images != null)
{
foreach (var image in Screens[Index].Images)
{
var imageView = new UIImageView();
imageView.ContentMode = UIViewContentMode.ScaleAspectFit;
try
{
using (var url = new NSUrl(image.Url))
{
using (var data = NSData.FromUrl(url))
{
imageView.Image = UIImage.LoadFromData(data);
}
}
}
catch (Exception ex)
{
// Display error!!
// throw ex;
var alert = UIAlertController.Create("Something goes wrong", "Invalid format for image data", UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alert, true, null);
}
var imageRatio = imageView.IntrinsicContentSize.Width / imageView.IntrinsicContentSize.Height;
var stackViewWidth = View.Frame.Width - twiceHorizontalPad;
var resizedHeight = stackViewWidth / imageRatio; // Pretty hacky!! Maybe can achieve the same thing by setting vertical hugging priority?
stackView.AddArrangedSubview(imageView);
View.ConstrainLayout(() =>
imageView.Frame.Height == resizedHeight
);
}
}
if (Screens[Index].Texts != null)
{
foreach (var text in Screens[Index].Texts)
{
var textLabel = new UILabel
{
Text = text.TextValue,
Lines = 0,
LineBreakMode = UILineBreakMode.WordWrap,
Font = UIFont.SystemFontOfSize(Constants.LargeFontSize),
};
stackView.AddArrangedSubview(textLabel);
View.ConstrainLayout(() =>
textLabel.Frame.Width == stackView.Frame.Width
);
}
}
if (Screens[Index].Options != null)
{
// Question
var questionLabel = new UILabel
{
Text = Screens[Index].Question,
Lines = 0,
LineBreakMode = UILineBreakMode.WordWrap,
Font = UIFont.SystemFontOfSize(Constants.LargeFontSize),
};
stackView.AddArrangedSubview(questionLabel);
View.ConstrainLayout(() =>
questionLabel.Frame.Width == stackView.Frame.Width
);
// Options
var optionsUIs = new List <Tuple <UIButton, UIButton, Option> >();
var i = 1;
foreach (var option in Screens[Index].Options)
{
var transparentGap = new UIView();
stackView.AddArrangedSubview(transparentGap);
View.ConstrainLayout(() =>
transparentGap.Frame.Height == 5f
);
var optionStackView = new UIStackView
{
Axis = UILayoutConstraintAxis.Horizontal,
Alignment = UIStackViewAlignment.Center,
Distribution = UIStackViewDistribution.EqualSpacing,
Spacing = Constants.SmallGap,
};
stackView.AddArrangedSubview(optionStackView);
var optionRadioButton = new UIButton(UIButtonType.RoundedRect);
optionStackView.AddArrangedSubview(optionRadioButton);
optionRadioButton.SetImage(UIImage.FromBundle("checkmark.png"), UIControlState.Normal);
optionRadioButton.SetImage(UIImage.FromBundle("blank.png"), UIControlState.Disabled);
optionRadioButton.Enabled = false;
View.ConstrainLayout(() =>
optionRadioButton.Frame.Height == 20f &&
optionRadioButton.Frame.Width == 20f
);
var optionTextButton = new UIButton(UIButtonType.System)
{
LineBreakMode = UILineBreakMode.WordWrap,
HorizontalAlignment = UIControlContentHorizontalAlignment.Left,
VerticalAlignment = UIControlContentVerticalAlignment.Center,
Font = UIFont.SystemFontOfSize(Constants.LargeFontSize),
};
optionTextButton.SetTitle(option.Title, UIControlState.Normal);
optionStackView.AddArrangedSubview(optionTextButton);
var maxWidth = View.Frame.Width - Constants.HorizontalPad * 2 - optionRadioButton.Frame.Width;
var textSize = UIHelper.GetTextSize(option.Title, optionTextButton.Font, maxWidth, float.MaxValue);
var textHeight = textSize.Height;
View.ConstrainLayout(() =>
optionTextButton.Frame.Height == textHeight
);
optionsUIs.Add(new Tuple <UIButton, UIButton, Option>(optionRadioButton, optionTextButton, option));
i++;
}
foreach (var tuple in optionsUIs)
{
tuple.Item2.TouchUpInside += (sender, e) =>
{
SelectedOptionId = tuple.Item3.Id;
tuple.Item1.Enabled = true;
foreach (var otherTuple in optionsUIs)
{
if (!Object.ReferenceEquals(sender, otherTuple.Item2))
{
otherTuple.Item1.Enabled = false;
}
}
};
}
}
// Start media automatically
if ((MediaPlayer != null) && (!String.IsNullOrWhiteSpace(mediaPlayerUrl)))
{
MediaPlayer.Play();
}
}
