Xamarin自定义渲染器事件未从TabbedPage触发

时间:2020-02-13 12:47:54

标签: android xamarin custom-renderer

我已经为问题苦苦挣扎了一段时间了,我对xamarin还是很陌生。我有一个包含多个自定义渲染器的脚本。我的第一个Renderers click事件运行得很好,但是其他所有click事件都不能,它们甚至都没有被调用。下面是我的Renderer脚本代码

[assembly: ExportRenderer(typeof(CustomLogoutButton),typeof(CustomLogoutButtonRenderer))]
[assembly: ExportRenderer(typeof(CustomRoundButton), typeof(CustomRoundButtonRenderer))]
[assembly: ExportRenderer(typeof(CustomScanButton), typeof(CustomScanButtonRenderer))]
[assembly: ExportRenderer(typeof(CustomTransactionButton), typeof(CustomTransactionButtonRenderer))]
namespace VoucherSystemApp.Droid.CustomRenderClasses
{
public class CustomRoundButtonRenderer : ButtonRenderer
{
    public CustomRoundButtonRenderer(Context context)
        : base(context) { }


    protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Button> e)
    {
        base.OnElementChanged(e);

        var theButton = Control;

        if(theButton != null)
        {
            theButton.Background = Android.App.Application.Context.GetDrawable(Resource.Drawable.RoundCornerButton);

            theButton.Click += TheButton_Click;
        }
    }

    private void TheButton_Click(object sender, EventArgs e)
    {
        ((IButtonController)Element)?.SendClicked();
    }

    protected override void Dispose(bool disposing)
    {

        if(Control != null)
        {
            Control.Click -= TheButton_Click;
        }
        base.Dispose(disposing);
    }
}

public class CustomScanButtonRenderer : ButtonRenderer
{
    public CustomScanButtonRenderer(Context context)
        : base(context) { }

    protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Button> e)
    {
        base.OnElementChanged(e);

        var theButton = Control;

        if(theButton != null)
        {

            theButton.Background = Android.App.Application.Context.GetDrawable(Resource.Drawable.SemiRoundCornerButton);

            theButton.Click += TheButton_Click;
        }
    }

    private void TheButton_Click(object sender, EventArgs e)
    {
        ((IButtonController)Element)?.SendClicked();
    }

    protected override void Dispose(bool disposing)
    {

        if (Control != null)
        {
            Control.Click -= TheButton_Click;
        }
        base.Dispose(disposing);
    }
}

public class CustomTransactionButtonRenderer : ButtonRenderer
{
    public CustomTransactionButtonRenderer(Context context)
        : base(context) { }

    protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Button> e)
    {
        base.OnElementChanged(e);

        var theButton = Control;

        if (theButton != null)
        {
            theButton.Background = Android.App.Application.Context.GetDrawable(Resource.Drawable.TransactionsButton);

            theButton.Click += TheButton_Click;
        }
    }

    private void TheButton_Click(object sender, EventArgs e)
    {
        ((IButtonController)Element)?.SendClicked();
    }

    protected override void Dispose(bool disposing)
    {

        if (Control != null)
        {
            Control.Click -= TheButton_Click;
        }
        base.Dispose(disposing);
    }
}

public class CustomLogoutButtonRenderer : ButtonRenderer
{
    public CustomLogoutButtonRenderer(Context context)
        : base(context) { }

    protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Button> e)
    {
        base.OnElementChanged(e);

        var theButton = Control;

        if (theButton != null)
        {

            theButton.Background = Android.App.Application.Context.GetDrawable(Resource.Drawable.ProfileButton);


            theButton.Click += TheButton_Click;
        }


    }

    private void TheButton_Click(object sender, EventArgs e)
    {
        ((IButtonController)Element)?.SendClicked();
    }

    protected override void Dispose(bool disposing)
    {

        if (Control != null)
        {
            Control.Click -= TheButton_Click;
        }
        base.Dispose(disposing);
    }
}`

在后面的TabbedPage代码中,我只是正常调用click事件,该事件适用于我的第一个按钮,但不适用于其他任何按钮。

1 个答案:

答案 0 :(得分:0)

指出,在回答时,xamarin表单不喜欢将控件嵌套得太深(例如,嵌套在嵌套中的嵌套等),因此事件不会触发。我希望这对以后的人有所帮助!