我正在為我的元素設(shè)置一個(gè)顯式HeightRequest的；但是調(diào)試的時(shí)候，實(shí)際好像跳到了. 這是我的 Xaml：16ImageHeight70<Grid Margin="1" Padding="0" ColumnSpacing="0" RowSpacing="0" HeightRequest="17"> <BoxView CornerRadius="3" Color="LightGray"/> <BoxView Margin="1" CornerRadius="3" BackgroundColor="White"/> <StackLayout Margin="2,0,2,0" Orientation="Horizontal" HeightRequest="17" Spacing="0"> <Image Source="hooray_icon" WidthRequest="16" HeightRequest="16" Margin="1,0,1,0" Aspect="Fill"/> <Label Text="{Binding HoorayCount}" Margin="1,0,1,0" VerticalOptions="Center" VerticalTextAlignment="Center" HorizontalOptions="Center" HorizontalTextAlignment="Center" HeightRequest="16"/> </StackLayout></Grid>預(yù)期設(shè)計(jì)：實(shí)際設(shè)計(jì)：hooray_icon是一個(gè) 512x512 PNG 圖像。Xamarin.Forms 版本：3.6.0.293080PS 我知道這是通過(guò)使用和覆蓋以及調(diào)試和方法Image導(dǎo)致問(wèn)題的元素。如果我弄錯(cuò)了，請(qǐng)糾正我。class CustomImage : ImageOnMeasureOnSizeAllocated
1 回答
千巷貓影
TA貢獻(xiàn)1829條經(jīng)驗(yàn) 獲得超7個(gè)贊
回答
HeightRequest不能保證，這只是一個(gè)請(qǐng)求。如果 Xamarin.Forms 能夠滿足請(qǐng)求，它會(huì)執(zhí)行它，但根據(jù)屏幕大小和布局，它可能無(wú)法滿足請(qǐng)求。
解決方案
設(shè)置Grid.ColumnDefinition'sWidth和Grid.RowDefinition'sHeight的值。
代碼
<Grid Margin="1" Padding="0" ColumnSpacing="0" RowSpacing="0">
<Grid.RowDefinitions>
<RowDefinition Height="17" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="17" />
<ColumnDefinition Width="17" />
<ColumnDefinition Width="17" />
</Grid.ColumnDefinitions>
<BoxView CornerRadius="3" Color="LightGray" Grid.Row="0" Grid.Column="0"/>
<BoxView Margin="1" CornerRadius="3" BackgroundColor="White" Grid.Row="0" Grid.Column="1"/>
<StackLayout Margin="2,0,2,0" Orientation="Horizontal" Spacing="0" Grid.Row="0" Grid.Column="2">
<Image Source="hooray_icon"
Margin="1,0,1,0"
Aspect="Fill"
HeightRequest="16"/>
<Label Text="{Binding HoorayCount}"
Margin="1,0,1,0"
VerticalOptions="Center"
VerticalTextAlignment="Center"
HorizontalOptions="Center"
HorizontalTextAlignment="Center"
HeightRequest="16"/>
</StackLayout>
</Grid>
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