更改 Xamarin Forms XAML 按钮的 isVisible 属性 [英] Changing isVisible property of Xamarin Forms XAML buttons
问题描述
我正在尝试在 Xamarin Forms ContentPage 中动态显示/隐藏按钮.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) 中的任何属性更改做出反应.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
更改 xmal 文件中的代码并编写开始和停止按钮的属性
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 中为开始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");
}
}
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