Questions on UI for Xamarin Forum

3 answers

303 views

Hello Telerik Team,

I know there is a command, ClearCommand from the RadPickerBase, which could be used in order to clear out the picker's value. But I need to be able to clear the picker value from inside the selector Popup. Can you help me with this?

This is my datePicker declaration:

<telerik:RadDateTimePicker SelectedDate="{Binding Value}">

<telerik:RadDateTimePicker.SelectorSettings>

<telerik:PickerPopupSelectorSettings FooterTemplate="{StaticResource PickerFooterTemplate}" />

</telerik:RadDateTimePicker.SelectorSettings>

</telerik:RadDateTimePicker>

And this is an attempt to get the Clear command from the datePicker:

01.<ControlTemplate x:Key="PickerFooterTemplate">

02. <StackLayout Orientation="Horizontal"

03. Spacing="0"

04. HorizontalOptions="FillAndExpand"

05. BackgroundColor="{StaticResource SecondaryButtonColor}">

06. <Button Text="Clear"

07. TextColor="{StaticResource TextColor}"

08. BackgroundColor="Transparent"

09. -->Command="{Binding Source={RelativeSource FindAncestor, AncestorType={x:Type telerik:RadDateTimePicker}, AncestorLevel=1}, Path=ClearCommand}" />

10. <Button Text="{TemplateBinding AcceptButtonText}"

11. TextColor="{StaticResource TextColor}"

12. BackgroundColor="Transparent"

13. Command="{TemplateBinding AcceptCommand}" />

14. <Button Text="{TemplateBinding CancelButtonText}"

15. TextColor="{StaticResource TextColor}"

16. BackgroundColor="Transparent"

17. Command="{TemplateBinding CancelCommand}" />

18. </StackLayout>

19.</ControlTemplate>

DateTimePicker

answered on 20 May 2020

1 answer

224 views

Show List Picker

Hello good afternoon I am testing the ListPicker. Is there a C # command to display the ListPicker? Thank you

ListPicker

answered on 18 May 2020

1 answer

172 views

RadBusyIndicator crashed app on ios

I added follow code in my project, and it worked on debug mode(both simulator and phsical device), but when I release version to appstore testflight, It crashed app on the start moment.

Version is: 2020.2.513.1, from Nuget

<telerikPrimitives:RadBusyIndicator x:Name="busyIcon"

WidthRequest="50"

HeightRequest="50"

AnimationContentHeightRequest="30"

AnimationContentWidthRequest="30"

AnimationType="Animation3"

InputTransparent="True"

AnimationContentColor="#0010FF"

IsBusy="True" />

Crash log:

Unhandled Exception:

System.FormatException: Missing property Angle for type Telerik.XamarinForms.Common.RadRotateTransform.

at Telerik.XamarinForms.Common.RadAnimation.ParsePropertyPath () <0x1046a88d0 + 0x002ac> in <929afeb7a38f475f9d99bceb2d877ef0#66a759f5bd22eddc758fd4fd4947aae4>:0

at Telerik.XamarinForms.Common.RadAnimation.UpdateTargetPropertyValue (System.Object value) <0x1046a8850 + 0x00037> in <929afeb7a38f475f9d99bceb2d877ef0#66a759f5bd22eddc758fd4fd4947aae4>:0

at Telerik.XamarinForms.Common.RadDoubleAnimation.OnAnimationValueChanged (System.Double value) <0x1046a91b0 + 0x00053> in <929afeb7a38f475f9d99bceb2d877ef0#66a759f5bd22eddc758fd4fd4947aae4>:0

at Telerik.XamarinForms.Common.RadDoubleAnimation.OnAnimationTick (System.String animationName, System.Double value) <0x1046a9130 + 0x0003b> in <929afeb7a38f475f9d99bceb2d877ef0#66a759f5bd22eddc758fd4fd4947aae4>:0

at Telerik.XamarinForms.Common.RadAnimation.Telerik.XamarinForms.Common.Animations.IDoubleAnimationListener.OnAnimati<…>

General Discussions

answered on 14 May 2020

3 answers

714 views

Binding Color in Gradient Stops

Hello,

I am trying to binding the colors of a GaugeBarIndicator, but it doesn't work. The error is: "Cannot assign property "Color": Property does not exist, or is not assignable, or mismatching type between value and property"

Code XAML file:

<telerikGauges:RadRadialGauge x:Name="gauge" AxisRadiusFactor="1"

StartAngle="90" SweepAngle="360">

<telerikGauges:RadRadialGauge.Axis>

<telerikGauges:GaugeLinearAxis Minimum="0" Maximum="1"

StrokeThickness="0" ShowLabels="False" />

</telerikGauges:RadRadialGauge.Axis>

<telerikGauges:RadRadialGauge.Indicators>

<telerikGauges:GaugeBarIndicator Value="1"

StartThickness="10" EndThickness="10" Fill="#ebebeb" />

<telerikGauges:GaugeBarIndicator Value="0.5" StartCap="Oval"

StartThickness="10" EndThickness="10" EndCap="Oval"

IsOffsetRelative="True">

<telerikGauges:GaugeBarIndicator.GradientStops>

<telerikCommon:RadGradientStop Offset="0"

Color="{Binding StartColor}" />

<telerikCommon:RadGradientStop Offset="1"

Color="{Binding EndColor}" />

</telerikGauges:GaugeBarIndicator.GradientStops>

</telerikGauges:GaugeBarIndicator>

</telerikGauges:RadRadialGauge.Indicators>

</telerikGauges:RadRadialGauge>

The property in C# file:

private Color startColor;

public Color StartColor

{

get { return startColor; }

set {

startColor = value;

OnNotifyPropertyChanged("StartColor");

}

Do you know how can I make it work?

Thank you.

Gauges

answered on 11 May 2020

12 answers

437 views

RadListView renderer throws NullReferenceException on device but not simulator

Hi there,

I'm struggling to get the ListView working on my iOS devices. On the simulator these work fine, but on the devices i keep getting this error;

NullReferenceException: Object reference not set to an instance of an object

on the following line in my Main.cs file (same as the default xamarin one);

UIApplication.Main(args, null, "AppDelegate");

here's the stack trace

at Telerik.XamarinForms.DataControlsRenderer.iOS.ListView.UIListViewCell.UpdateSelectionViewStyle () [0x000b5] in <69c148d17a40435da18b2f1c1ff180c5>:0

at Telerik.XamarinForms.DataControlsRenderer.iOS.ListView.UIListViewCell.UpdateCell (Telerik.XamarinForms.DataControls.RadListView owner, System.Object dataItem) [0x0005a] in <

69c148d17a40435da18b2f1c1ff180c5>:0

at Telerik.XamarinForms.DataControlsRenderer.iOS.ListViewDataSource.InitCell (TelerikUI.TKListView listView, Foundation.NSIndexPath indexPath, TelerikUI.TKListViewCell tkCell, Foundation.NSObject obj) [0x000f5] in <

69c148d17a40435da18b2f1c1ff180c5>:0

at ObjCRuntime.Trampolines+SDActionArity4V1.Invoke (System.IntPtr block, System.IntPtr arg1, System.IntPtr arg2, System.IntPtr arg3, System.IntPtr arg4) [0x00033] in <

9e260fcc0dbf47638fe447f503155067>:0

at (wrapper native-to-managed) ObjCRuntime.Trampolines+SDActionArity4V1:Invoke (intptr,intptr,intptr,intptr,intptr)

ListView

answered on 07 May 2020

2 answers

93 views

Start and End Date limiting

I am setting the start and end date on the control which works mostly but the senario I am having issues with is if I set the end date for 1 month in the future it shows the rest of the year in the picker (which isnt a big deal really) and if i select a date say 2 months in the future it never updates the selected date (which is correct) but it just closes the control without any user feedback. Is there an event that can catch this or some way of setting a warning?

DateTimePicker

answered on 06 May 2020

8 answers

208 views

RadBorder RotateTo animation overlaps inside controls

Hi, I need to animate my RadBorder. However, when I rotate border to the left, my controls are overlapped. Code is attached. I did it using Frame as a parent element and it works fine.

<telerikPrimitives:RadBorder x:Name="bnSolo" Grid.Row="0" Grid.Column="0" BorderColor="Yellow" CornerRadius="25">

<Grid BackgroundColor="Transparent">

<Image Source="homesolo" VerticalOptions="StartAndExpand" HorizontalOptions="CenterAndExpand" />

<Label Text="Solo" VerticalOptions="CenterAndExpand" HorizontalOptions="CenterAndExpand" />

</Grid>

<telerikPrimitives:RadBorder.GestureRecognizers>

<TapGestureRecognizer Tapped="PlayNowButton_Clicked" />

</telerikPrimitives:RadBorder.GestureRecognizers>

</telerikPrimitives:RadBorder>

await bnSolo.RotateTo(25, 500, Easing.Linear);

await bnSolo.RotateTo(-25, 500, Easing.Linear);

Border

answered on 30 Apr 2020

5 answers

857 views

Popup Gets Close By Android Back Button

Hi,

I am popping up a modal message that I want the user to acknowledge by pressing on a close button inside the popup.

If they accidently press the back button on the device the modal popup is closed.

Is there any way to stop this from happening?

Thanks

Anthony

Popup

answered on 30 Apr 2020

1 answer

206 views

GroupHeaderTemplate for blank values

This isnt necessarily just blank values but I am trying to style the group template based on the value being grouped on. I have a custom GroupHeaderTemplate and GroupHeaderStyle set and have tried converters but it never seems to be fired. is this the right path or is there another way of hiding the groupby header or using a different template based on the vale being grouped?

ListView

answered on 28 Apr 2020

6 answers

409 views

UIWebView deprecation

I've recently gotten this message when submitting to Test Flight:
ITMS-90809: Deprecated API Usage - Apple will stop accepting submissions of apps that use UIWebView APIs . See https://developer.apple.com/documentation/uikit/uiwebview for more information.

I am not using UIWebView anywhere in my application, so I'm wondering do any of the Telerik Xamarin controls use it?

General Discussions

answered on 28 Apr 2020