Best Of

Re: Switching back and forth between VS for Windows and Mac

Did you use the latest version of Visual Studio 2019?
It includes Xamarin iOS 14.0.0.0:

The latest version of VS for Mac also includes the same version of Xamarin iOS:

If you were using an old version of Visual Studio 2019, there will be an incompatible Xamarin iOS version issue.
We could also separately install the previous version of Xamarin iOS here:
https://github.com/xamarin/xamarin-macios/releases

is there a table somewhere that lists the components revisions for the various VS & Xamarin.Forms versions

Take a look at the release notes here:
https://docs.microsoft.com/en-us/xamarin/xamarin-forms/release-notes/

LandLu

Re: Xamarin.GooglePlayServices Ads Showing Warning

You could post the issue to Help -> Send feedback ->Report a problem .

LucasZhang

Re: ICommand not works

CanExecute method only triggers once at the initialization of ICommand , first you need to make NewCustomer class implement INotifyPropertyChanged ,and manually triggers CanExecuteChanged event of the ICommand , the button's status would update after then .

ColeX

Re: Move from Entry1 to Entry when pressing space-button

@ganesh96

Xaml

<StackLayout>
    <Entry x:Name="entry1" TextChanged="entry1_TextChanged" BackgroundColor="LightBlue"/>
    <Entry x:Name="entry2" TextChanged="entry2_TextChanged" BackgroundColor="LightGreen"/>
    <Entry x:Name="entry3" BackgroundColor="LightPink"/>
</StackLayout>

Code-Behind

private void entry1_TextChanged(object sender, TextChangedEventArgs e)
{
    if (e.NewTextValue.Length > 0 && e.NewTextValue[e.NewTextValue.Length - 1].Equals(' '))
    {
        entry1.Text = e.OldTextValue;
        entry2.Focus();
    }
}

private void entry2_TextChanged(object sender, TextChangedEventArgs e)
{
   if (e.NewTextValue.Length > 0 && e.NewTextValue[e.NewTextValue.Length - 1].Equals(' '))
   {
       entry2.Text = e.OldTextValue;
       entry3.Focus();
   }
}

I was not able to find the code to manually/programmatically trigger the return key of an entry if that can be done the code can be added as a behavior to entry and will be much more elegant and reusable.

XamDevST

Re: Change statusbar color and splash screen color based on dark theme

Sorry, launch storyboard can not do something according to different screen. because it not contains the property with screen size for us to call, and we also can not use code for launch stroryboard.

jezh

Re: Change binding based on switch IsToggled property

@mndevelopments Yes very doable.
Use data trigger and bind your entry to whatever you want let's say PropertyOne when the switch value is true and another value say PropertyTwo when it is false

<Entry>
    <Entry.Triggers>
        <DataTrigger TargetType="Entry" Binding="{Binding IsInhomogent}" Value="True">
            <Setter Property="Text" Value="{Binding PropertyOne}"/>
        </DataTrigger>
        <DataTrigger TargetType="Entry" Binding="{Binding IsInhomogent}" Value="False">
            <Setter Property="Text" Value="{Binding PropertyTwo}"/>
        </DataTrigger>
    </Entry.Triggers>
</Entry

Whenever you want to do anything programmatic in Xaml, Triggers and Converters should be your goto options

XamDevST

Re: Collection View Binding is not getting updated on page load

If you want the UI refresh automatically when you change the value of one item,then you can try to make your model Item_Categories implement interface INotifyPropertyChanged.

For example:

    public class Item_Categories : INotifyPropertyChanged
    {
        string _itemCategory;
        public string ItemCategory
        {
            private set { SetProperty(ref _itemCategory, value); }
            get { return _itemCategory; }
        }

        private bool _isChecked;

        public bool IsChecked
        {
            set { SetProperty(ref _isChecked, value); }
            get { return _isChecked; }
        }

        bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null)
        {
            if (Object.Equals(storage, value))
                return false;

            storage = value;
            OnPropertyChanged(propertyName);
            return true;
        }

        protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        public event PropertyChangedEventHandler PropertyChanged;
    }

jezh

Re: How to tell a screen reader programmatically to read an Entry character by character?

it needs to be read character by character (rather than trying to read it as one or more words)

Try to change the spacing of the of spoken text. Detect the Entry's TextChanged event to change the at runtime.

Refer to: https://stackoverflow.com/a/37042092/11083277

Jarvan

Re: outlined text field

@bhuwancb99
Step 1:

Create a Borderless Entry Control

Step 2:

Add a Control Template in App.xaml

<ControlTemplate x:Key="OutlinedEntry">
            <RelativeLayout BindingContext="{Binding Source={RelativeSource TemplatedParent}}" Margin="0" Padding="0"
                            HeightRequest="{Binding ControlHeightRequest}" BackgroundColor="White">
                <Frame CornerRadius="{Binding FrameCornerRadius}" BorderColor="{Binding OutlineColor}" Margin="0,5,0,0" Padding="0"
                       RelativeLayout.XConstraint="{ConstraintExpression Type=RelativeToParent,Property=X,Factor=0}"
                       RelativeLayout.YConstraint="{ConstraintExpression Type=RelativeToParent,Property=Y,Factor=10}"
                       RelativeLayout.WidthConstraint="{ConstraintExpression Type=RelativeToParent,Property=Width,Factor=1}"
                       RelativeLayout.HeightConstraint="{ConstraintExpression Type=RelativeToParent,Property=Height,Factor=1}"
                       HasShadow="False">
                    <Entry Margin="10,5" Text="{Binding EntryText}" TextColor="{Binding EntryTextColor}" VerticalOptions="Center"/>
                </Frame>
                <Label TextColor="{Binding OutlineColor}" BackgroundColor="White" Margin="0,-5,0,0"
                       RelativeLayout.XConstraint="{ConstraintExpression Type=RelativeToParent,Property=X,Factor=0,Constant=20}"
                       RelativeLayout.YConstraint="{ConstraintExpression Type=RelativeToParent,Property=Y,Factor=0}">
                    <Label.FormattedText>
                        <FormattedString>
                            <Span Text="| "/>
                            <Span Text="{Binding HeaderText}"/>
                            <Span Text=" |"/>
                            <!--
                            or just plain
                            <Span Text=" "/>
                            <Span Text="{Binding HeaderText}"/>
                            <Span Text=" "/>

                            This is not working for whatever reason
                            Text="{Binding HeaderText,StringFormat=' {0} '}"
                            -->
                        </FormattedString>
                    </Label.FormattedText>
                </Label>
            </RelativeLayout>
        </ControlTemplate>

Step 3:

Add a control class

public class CustomOutlineEntry : ContentView
    {
        public static readonly BindableProperty EntryTextColorProperty = BindableProperty.Create(nameof(EntryTextColor), typeof(Color), typeof(CustomOutlineEntry), Color.Brown);
        public static readonly BindableProperty OutlineColorProperty = BindableProperty.Create(nameof(OutlineColor), typeof(Color), typeof(CustomOutlineEntry), Color.Black);
        public static readonly BindableProperty EntryTextProperty = BindableProperty.Create(nameof(EntryText), typeof(string), typeof(CustomOutlineEntry), "Text");
        public static readonly BindableProperty HeaderTextProperty = BindableProperty.Create(nameof(HeaderText), typeof(string), typeof(CustomOutlineEntry), "Header");
        public static readonly BindableProperty ControlHeightRequestProperty = BindableProperty.Create(nameof(ControlHeightRequest), typeof(double), typeof(CustomOutlineEntry), 60.0);
        public static readonly BindableProperty FrameCornerRadiusProperty = BindableProperty.Create(nameof(FrameCornerRadius), typeof(float), typeof(CustomOutlineEntry),float.Parse("5"));

        public Color EntryTextColor
        {
            get => (Color)GetValue(EntryTextColorProperty);
            set => SetValue(EntryTextColorProperty, value);
        }

        public Color OutlineColor
        {
            get => (Color)GetValue(OutlineColorProperty);
            set => SetValue(OutlineColorProperty, value);
        }

        public string EntryText
        {
            get => (string)GetValue(EntryTextProperty);
            set => SetValue(EntryTextProperty, value);
        }

        public string HeaderText
        {
            get => (string)GetValue(HeaderTextProperty);
            set => SetValue(HeaderTextProperty, value);
        }

        public double ControlHeightRequest
        {
            get => (double)GetValue(ControlHeightRequestProperty);
            set => SetValue(ControlHeightRequestProperty, value);
        }

        public float FrameCornerRadius
        {
            get => (float)GetValue(FrameCornerRadiusProperty);
            set => SetValue(FrameCornerRadiusProperty, value);
        }
    }

Use the control

<local:CustomOutlineEntry  ControlTemplate="{StaticResource OutlinedEntry}" Margin="10"
 EntryTextColor="DeepPink" OutlineColor="Orange" EntryText="[email protected]" 
HeaderText="E-mail" FrameCornerRadius="7" BackgroundColor="White"/>

XamDevST

Re: My app shows popup "Myapp wants to search for other devices on the network and connect with them"??

It's a new privacy feature of iOS 14 as described in the WWDC 2020 "Support local network privacy in your app" session:

Apps now trigger a prompt the first time they try to interact with the local network. Until permission is granted all local network communication is blocked. The prompt includes a usage description that you specify in your app's info.plist. Apps that haven't updated to iOS 14 will show default reason text. If you notice a prompt that you don't expect for your app, you might be using a third party framework that accesses the local network.

https://developer.apple.com/videos/play/wwdc2020/10110/

LeonLu