Xamarin开发笔记—设备类&第三方弹窗的使用和注意事项

一、设备类是Xamarin重要开发组成部分，下面介绍一下设备类的主要用法：

//唤醒打电话
Device.OpenUri(new Uri("tel:180xxxxxxxx"));

//打开网页
Device.OpenUri(new Uri("http://vipstone.cnblogs.com/"));

//判断当前运行平台
Device.RuntimePlatform => Device.iOS, Device.Android, Device.WinPhone

//设备类型平板、手机、桌面
Device.Idiom => TargetIdiom.Phone, TargetIdiom.Tablet, TargetIdiom.Desktop

//计数器延迟执行
Device.StartTimer (new TimeSpan (0, 0, 60), () => {
　　// do something every 60 seconds
　　return true; // runs again, or false to stop
});

更多Device相关信息请访问：https://developer.xamarin.com/guides/xamarin-forms/platform-features/device/

二、第三方弹窗，模态窗口

先看效果图：

模态窗口git地址：https://github.com/rotorgames/Rg.Plugins.Popup

基本实现核心代码：

<?xml version="1.0" encoding="utf-8" ?>
<pages:PopupPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="ywgoapp.Pages.Upgrade.UpgradePrompt"
             xmlns:pages="clr-namespace:Rg.Plugins.Popup.Pages;assembly=Rg.Plugins.Popup">
    <StackLayout VerticalOptions="Center" WidthRequest="290" HorizontalOptions="Center" Spacing="0">
        <AbsoluteLayout VerticalOptions="Start">
            <Image Source="upgrade_bgtop.png" WidthRequest="290" AbsoluteLayout.LayoutFlags="PositionProportional" AbsoluteLayout.LayoutBounds="0,0"></Image>
            <Label x:Name="lb_version" Text="版本升级" AbsoluteLayout.LayoutFlags="XProportional" AbsoluteLayout.LayoutBounds="0.5,74" FontSize="16" TextColor="White"></Label>
            <Image x:Name="img_close" IsVisible="False" Source="close3.png" HeightRequest="24" WidthRequest="24" AbsoluteLayout.LayoutFlags="XProportional" AbsoluteLayout.LayoutBounds=".96,52">
                <Image.GestureRecognizers>
                    <TapGestureRecognizer Tapped="OnCloseTap"></TapGestureRecognizer>
                </Image.GestureRecognizers>
            </Image>
        </AbsoluteLayout>
        <ScrollView Padding="30,20" MinimumHeightRequest="160" BackgroundColor="White">
            <Label x:Name="lb_content" Text="" FontSize="12"></Label>
        </ScrollView>
        <StackLayout Padding="50,0,50,10" BackgroundColor="White">
            <Button Text="立即升级" BackgroundColor="#4BC1D2" TextColor="White" Clicked="Button_Clicked">
            </Button>
        </StackLayout>
        <StackLayout Spacing="0">
            <Image Source="upgrade_bgbottom.png" WidthRequest="290" Aspect="AspectFill"></Image>
        </StackLayout>
    </StackLayout>
</pages:PopupPage>

调用代码：

this.Navigation.PushPopupAsync(new UpgradePrompt());

弹窗要注意的点：

1.不想点击任何区域都消失的话，需要重新OnBackgroundClicked事件：return false；

2.手动关闭窗体：PopupNavigation.PopAsync()；