更改Xamarin Forms XAML按钮的isVisible属性 [英] Changing isVisible property of Xamarin Forms XAML buttons
本文介绍了更改Xamarin Forms XAML按钮的isVisible属性的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试动态显示/隐藏Xamarin Forms ContentPage中的按钮. 我的XAML代码中有两个按钮:
I am trying to dynamically show/hide button inside Xamarin Forms ContentPage. I have two buttons in my XAML code:
<StackLayout Orientation="Vertical">
<Button x:Name="start_btn" Clicked="startPanic">
<Button.Text>START</Button.Text>
</Button>
<Button x:Name="stop_btn" IsVisible="false">
<Button.Text>STOP</Button.Text>
</Button>
</StackLayout>
对应的C#代码:
public partial class PanicPage : ContentPage
{
private Button startBtn;
private Button stopBtn;
public PanicPage ()
{
InitializeComponent ();
startBtn = this.FindByName<Button> ("start_btn");
stopBtn = this.FindByName<Button> ("stop_btn");
}
private void startPanic(object sender, EventArgs args){
Device.BeginInvokeOnMainThread (() => {
startBtn.IsVisible = false;
stopBtn.IsVisible = true; // DOESN'T WORK, button still will be hidden
});
}
}
当我在XAML中设置isVisible属性时,它不会对事件方法(startPanic)中的任何属性更改作出反应.我该如何解决?
When I set isVisible property in XAML, it doesn't react for any property change in event method (startPanic). How can I fix it?
推荐答案
在xmal文件中更改代码并为开始"和停止"按钮编写属性
Change your code in xmal file and write properties for start and stop button
<Button x:Name="start_btn" Clicked="startPanic" IsVisible="{Binding IsStartVisible}">
<Button.Text>START</Button.Text>
</Button>
<Button x:Name="stop_btn" IsVisible="{Binding IsStopVisible}">
<Button.Text>STOP</Button.Text>
</Button>
在ViewModel中,为启动按钮编写以下属性和类似内容,并根据您的逻辑设置IsStopVisible = true/false
In ViewModel write following property and similar for start button and set IsStopVisible =true/false based on your logic
private bool _isStopVisible;
public bool IsStopVisible{
get {
return _isStopVisible;
}
set {
_isStopVisible= value;
RaisePropertyChanged ("IsStopVisible");
}
}
这篇关于更改Xamarin Forms XAML按钮的isVisible属性的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文