如何解决xamarin Visual iOS自定义进度栏和Web容器
我们一直在开发适用于Android和iOS的Xamarin应用,该应用在Android上可以完美运行,但是自定义动态进度栏以及从Web容器切换回首页确实有一个奇怪的问题。
短暂切换
当我们从普通页面切换时,会重新加载完整的主页,因此在初始化过程中会放置进度条。切换到Web容器和从Web容器切换时,是否需要以某种方式完全重新加载首页?
主页代码
namespace CustomApp
{
[XamlCompilation(XamlCompilationoptions.Compile)]
public partial class Homepage : ContentPage
{
static MyProgressBar progressbar1;
static MyProgressBar progressbar2;
public Homepage()
{
InitializeComponent();
addprogressbars();
}
void addprogressbars()
{
Device.BeginInvokeThread() =>
{
MainGrid.Children.Add(progressbar1 = new MyProgressBar()
{
VerticalOptions = Layoutoptions.Start,HorizontalOptions = Layoutoptions.Fill
},1,7);
Grid.SetColumnSpan(progressbar1,1);
progressbar1.Progress = App._level1;
MainGrid.Children.Add(progressbar2 = new MyProgressBar()
{
VerticalOptions = Layoutoptions.Start,HorizontalOptions = Layoutoptions.Fill
},4,7);
Grid.SetColumnSpan(progressbar2,1);
progressbar2.Progress = App._level2;
}
}
protected override void OnAppearing()
{
base.OnAppearing();
addprogressbars()
}
async void Accountspage(object sender,System.EventArgs args)
{
await Navigation.PushAsync(new accountpage());
}
async void Settingspage(object sender,System.EventArgs args)
{
await Navigation.PushAsync(new settingspage());
}
async void webcontpagea1(object sender,System.EventArgs args)
{
await Navigation.PushAsync(new webcontainer_001());
}
async void webcontpagea2(object sender,System.EventArgs args)
{
await Navigation.PushAsync(new webcontainer_002());
}
}
}
客户渲染进度条码
[assembly: ExportRenderer(typeof(MyProgressBar),typeof(MyProgressBarRenderer))]
namespace Custom_GeoPHEV.iOS
{
public class MyProgressBarRenderer : ProgressBarRenderer
{
protected override void OnElementChanged(
ElementChangedEventArgs<Xamarin.Forms.ProgressBar> e)
{
base.OnElementChanged(e);
if (Control != null)
{
Control.Progress = (int)0.5;
// Control.ScaleY = 5; //Changes the height
}
Control.ProgresstintColor = Color.Fromrgb(2,118,179).ToUIColor();
Control.TrackTintColor = Color.Fromrgb(0,0).ToUIColor();
}
public async override void LayoutSubviews()
{
await Task.Delay(0);
base.LayoutSubviews();
// this was 18.5
CGAffineTransform transform = CGAffineTransform.MakeScale(1.2f,10f);
transform.TransformSize(this.Frame.Size);
this.Transform = transform;
this.ClipsToBounds = true;
this.Layer.MasksToBounds = true;
}
}
}
Web容器xmal
<?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:d="http://xamarin.com/schemas/2014/forms/design"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
NavigationPage.HasNavigationBar="False"
mc:Ignorable="d"
x:Class="Custom_webcontrainer.page001"
Title="Trips"
>
<ContentPage.Content>
<Grid HorizontalOptions="CenterandExpand" RowSpacing="0" ColumnSpacing="0">
</Grid>
</ContentPage.Content>
</ContentPage>
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