In android, I can't seem to make my TabViewItem icon sizes larger. I tried adding an explicit height and width in the XML but that doesn't change anything. Right now, it looks like this: https://imgur.com/a/PudvqwF which is too small for me. I also tried giving it a class and changing via CSS but still no luck . My code is as follows:
<TabViewItem :title='`FAVORITES ${this.favorites && this.favorites.length ? this.favorites.length : ""}`' width="60" height="60" iconSource="~/assets/images/heart-Icon.png">
<Frame
id="favorites-list-frame"
row="0"
>
<CustomComponent/>
</Frame>
</TabViewItem>
Any way to make these larger?
Related
I created a solution (see code here) from a blank Xamarin Forms template, running the latest stable version of Xamarin Forms. I added the experimental Shapes and SwipeView as required into my native projects, and I have a list of rows just saying "Hello" inside a Collection View.
I attempted to add a semicircle shape to the right swipe item's Grid, so it looks like the row has a rounded edge instead of rectangular shape.
But as you can see in the image below, the Shape just disappears after swiping to the right the second time. And occasionally the shape won't even appear in the row's swipe item.
Please note that the label always displays though, its just the shape going away. Also tested in Android & noticed the same behaviour. Do you know what the issue might be and if there's a work around?
Edit: Posted this and got a response to create an issue. Still looking for a workaround though
You can use Frame with CornerRadius to achieve the result:
<StackLayout Orientation="Horizontal" Padding="0" Margin="0" Spacing="0">
<Label
Text="Left"
HorizontalOptions="CenterAndExpand"
VerticalOptions="CenterAndExpand" />
<!--<Path HorizontalOptions="EndAndExpand" Fill="White" Stroke="White" Aspect="Fill" Data="m0.19956,-0.20844l14.43749,0l0,0c7.97347,0 14.43748,6.51981 14.43748,14.56254c0,8.04265 -6.464,14.5625 -14.43748,14.5625l-14.43749,0l0,-29.12504z" >
<Path.RenderTransform>
<RotateTransform CenterX="14.637"
CenterY="14.3541"
Angle="180" />
</Path.RenderTransform>
</Path>-->
<Frame BackgroundColor="Yellow" CornerRadius="30" IsClippedToBounds="True" HeightRequest="30" WidthRequest="30" HorizontalOptions="End" Margin="0,0,-51,0">
</Frame>
</StackLayout>
I have an NS 6 app and testing on an iPhone 6+ with iOS 13.
In this app I have a ListView and in the ListView I have a nativescript-carousel.
In the carousel I have an image component that loads an external image. The issue is that when I load the page, the image is loaded, but the parent does not expand vertically to accommodate the full height of the image. I can only see a small portion of it.
I tried refreshing the ListView and calling page.requestLayout(), but that did not help. If I set the image height, everything works, but the issue is that some of the carousel items may not have an image, so I cannot commit to a set height.
Here is my code (truncated for brevity):
<ListView id="lst" items="{{ asks }}">
<ListView.itemTemplate>
<StackLayout class="ask-item">
…
<GridLayout rows="*" columns="*" marginTop="10">
<ns:Carousel items="{{ recs }}" color="white" pageChanged="myChangeEvent" android:indicatorAnimation="slide" indicatorColor="#999999" indicatorColorUnselected="#dddddd" indicatorOffset="0,15" showIndicator="true">
<ns:Carousel.itemTemplate>
<ns:CarouselItem backgroundColor="#f9f9f9" verticalAlignment="middle">
<StackLayout class="rec-item">
…
<Image src="{{ image }}" stretch="aspectFit" horizontalAlignment="center" />
…
</StackLayout>
</ns:CarouselItem>
</ns:Carousel.itemTemplate>
</ns:Carousel>
</GridLayout>
</StackLayout>
</ListView.itemTemplate>
</ListView>
What is the best way to handle this issue?
Thank you.
By nature iOS ListView height can not be changed once rendered, you will have to update the specific list item.
Try downloading the image upfront or listen to isLoading property change, once then capture the height of the raw image and bind the height to the layout. The images height could be in raw pixel, you might want to convert that into density independent pixel for better display on high resolution devices.
I have decided to try Xamarin Forms, because I thought that I can make one design for all platforms or at least Android and iOS.
However a simple form like:
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:app91="clr-namespace:App9;assembly=MasterDetail.Android"
x:Class="MasterDetail.CompetitorsListPage"
>
<StackLayout>
<Label Text="{Binding CurrentEvent.Name}"></Label>
<StackLayout Orientation="Horizontal">
<Button Text="By Place" Clicked="Button_OnClickedByPlace"></Button>
<Button Text="By Number" Clicked="Button_OnClickedByNumber"></Button>
<Button Text="By Rating" Clicked="Button_OnClickedByRating"></Button>
<Button Text="Change Event" Clicked="Button_OnClickedChangeEvent"></Button>
</StackLayout>
<ScrollView>
<ListView x:Name="couples" ItemSelected="Comps_OnItemSelected" ItemTapped="Couples_OnItemTapped">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.View>
<StackLayout Orientation="Horizontal">
<Label Text="{Binding Round}"></Label>
<Label Text="{Binding Pos, StringFormat='({0}).'}"></Label>
<Label Text="{Binding Name}"></Label>
<Label Text="{Binding StartingNumber}" ></Label>
<Label Text="{Binding OldRating, StringFormat=' [{0}]'}"></Label>
<!--<Label Text="{Binding NewRating, StringFormat=' {0} ]'}"></Label>-->
</StackLayout>
</ViewCell.View>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</ScrollView>
</StackLayout>
</ContentPage>
Looks completely different on Android and iOS. I do not mind colours, but font size? I do not set font anywhere in the code or xaml.
Any idea what am I doing wrong?
Here it is a picture showing both versions:
This is by design. Forms is intended to provide a native experience on each platform by using their respective UI standards. Android has a different default color scheme than iOS. iOS default buttons look different than Android.
You can override the default fonts, sizes, colors, etc if you like in order to provide a more consistent UI. Xamarin has also introduced Themes for Forms which help you provide a consistent UI between platforms.
Because Android has variety of screen sizes and different screen DPI as compared to standard dpi and font sizes across iOS devices, it is not possible to create same look. But you can certainly change Theme in the MainActivity of your Droid project and increase font size as per your convenience. Beware that your theme's font size may be too big for small devices and too small for big devices. You can add scaling factor for font size in your theme, but I have not been very successful, instead, I tried to design a UI that will automatically fit for the best.
As per Xamarin Evolve 2016, some questions were raised regarding font sizes, they said it is difficult, but they are trying to make some unified font sizing.
Although Xamarin.Forms has everything in Xaml and C#, you still need to use iOS assets and Android resources to customize look and feel.
For me, #Jason's answer and comments from #Egg and #Bill Reiss are spot-on.
Meanwhile, so often clients request "same font size" across platforms that something like this finds its way into base Styles or Theme to account for what seems to be "natively smaller" fonts on Android:
<OnPlatform x:TypeArguments="Font">
<OnPlatform.iOS>Bold,Medium</OnPlatform.iOS>
<OnPlatform.Android>Bold,Large</OnPlatform.Android>
<OnPlatform.WinPhone>Bold,Medium</OnPlatform.WinPhone>
</OnPlatform>
Something similar can also be expressed in code at or near app startup, for example as a base Label font added to global Styles dictionary.
Just wanted to give a concrete example of what others above alluded to.
Strange behavior on iOS - as you can see those are labels in StackLayout, while in Android they behave OK, in iOS second and third label behave more lithe they were in some kind of grid rather than stack –
You have put 5 labels in a horizontal stack, and haven't changed the layout options on any of them. This will 'stack' all 5 labels next to each other, then size them based on the amount of text to be displayed. There is not enough horizontal space to accommodate all of the text, so the labels are wrapping vertically. The longest labels show the most wrapping, but as they get longer other labels wrap as well, which is why the Pos and OldRating data raps in some labels. When I'm working out layouts like this I often add different background colors to each control so I can see how they are laying out.
There are different ways to solve this depending on your desired result. If you want the entire line of text to wrap you can concatenate the data behind the scenes and add it as one label. If you want the name to wrap and the other data to display without wrapping you can set WidthRequests on the labels.
I am trying to change the size of the PanoramaItem's title, but it doesnt work. I tried the FontSize attribute, but it does nothing. I could change the font size of the Panorama's title using this code:
<controls:Panorama.TitleTemplate>
<DataTemplate>
<TextBlock Text="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" FontSize="100" Margin="0,50,0,0" />
</DataTemplate>
</controls:Panorama.TitleTemplate>
Try setting Panorama.HeaderTemplate instead of TitleTemplate
It usually helps to open controls in Expression Blend when trying to style them for the first time, It makes it very easy to see all the different templates involved and their default values.
I need to create an Image Button for my application like web-oriented style.
I have an image 20x20 pixel and want an image button with the same dimension of the image.
I tried to set this inside my xaml but it doesn't work:
<Button Grid.Row="0" Margin="0" Padding="0" Click="AddtoFavorite_Click" Width="20" Height="20" VerticalAlignment="Top" HorizontalAlignment="Right">
<Button.Content>
<Image Source="/MyNamespace;component/images/star_yellow.png" Margin="0" Width="20" Height="20" />
</Button.Content>
</Button>
What is wrong?
SOLUTION
I found the best solution is:
<Image Source="/MyNamespace;component/images/star_yellow.png" ManipulationStarted="Image_ManipulationStarted" Width="20" Height="20"></Image>
Thanks to all!
I don't see particular errors in your code but I don't have the tools right now to test it ans see why it fails.
However you can create a VisualBrush with your image and use it as background for your Button:
<Button>
<Button.Background>
<ImageBrush ImageSource="xyz.png"/>
</Button.Background>
</Button>
Most Backgrounds are of type Brush, so you can use SolidColorBrush, LinearGradientBrush, ImageBrush, etc. You are not limited to colors.
I think the best solution is the following:
<Button ...>
<Button.Template>
<ControlTemplate>
<Image .... />
</ControlTemplate>
</Button.Template>
</Button>
Using manipulation started will result in subtly non-standard behaviour. On most buttons if you click on it but then drag off, the button click will not fire. However, if you use ManipulationStarted it will fire immediately.
The best way to manage these design time considerations is to use Expression Blend. In blend you can right click on the button and edit the template through the design tools, which makes knowing how to edit the xaml less important. It's really worth the effort to learn to use Blend.
This is old but I thought I would offer what I thought was a better solution here. Some of these solutions want you to replace the button with an image, or the background with an imagebrush. That's fine except it also surrounds the image with the normal button style, a black or white box (depending on your theme).
This solution lets you use an image as the button itself while maintaining the complete fidelity of a button but without having to subclass an object like the link by SilverGeek.
First, create a new style (either in your App.xaml or your page resources)
<Style x:Key="ImageButtonStyle" TargetType="Button">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid>
<Image x:Name="StartButtonImage" Source="/Images/YourImageFile.png"/>
<ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
Content=""/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
Now, just create a button anywhere using that style:
<Button Style={StaticResource ImageButtonStyle}/>
And add click events or whatever else you want. The button will take on the entire style of the image.
Maybe you will be interested in this article:
http://silvergeek.net/2011/01/14/imagebutton-control-for-win-phone-7/
The Button control can take most controls as its content (not just text), so you don't need an "image button" - instead, you simply need to put an Image control inside your Button like so:
<Button>
<Image Source="http://www.richmondwiki.org/images/search-button.png"></Image>
</Button>
This approach (as opposed to using an ImageBrush for the Button background) means that you don't have to worry about or hardcode the sizes of the Image/Button - WP7 will handle this for you.
Using the provided Button control instead of hooking into the manipulation events is recommended, so that you won't have to worry about things like having appropriate margins for touch targets, etc.
You can set your image as the background for the button, or if you want to do it as content, in theory it should work inside a stackpanel.
You don't even need to use a Button.
You can hook the MouseLeftButtonUp event on the Image control.
<Image
Source='blue02.png'
Width='26'
Height='26'
Margin='5'
MouseLeftButtonUp='Image_MouseLeftButtonUp' />