Xamarin.Forms：点击后错键文本对齐方式（安卓） [英] Xamarin.Forms: wrong button text alignment after click (Android)

问题描述

我对Android的一个问题，Xamarin.Forms（版本1.2.2）（Nexus的5）。 的排列 Button.Text 正在执行一个点击后经常不集中。

I have a problem with Xamarin.Forms (version 1.2.2) on Android (Nexus 5). The alignment of Button.Text is often not centered after performing a click.

在很短的项目，我想通了，是更新UI导致问题。

In a short project, I figured out, that updating the UI causes the problem.

public class App
{
    public static Page GetMainPage()
    {   
        var label = new Label {
            Text = "label",
        };
        var buttonBad = new Button {
            Text = "buttonBad",
            Command = new Command(() => label.Text += "1"),
        };
        var buttonGood = new Button {
            Text = "buttonGood",
        };

        return new ContentPage { 
            Content = new StackLayout {
                Children = {
                    buttonBad,
                    buttonGood,
                    label,
                }
            }
        };
    }
}

在buttonBad一个点击（更新 label.Text ）导致此按钮上的文字对齐到不能再居中。在buttonGood咔嗒不会造成问题。

A click on "buttonBad" (updating the label.Text) causes the text-alignment of this button to not be centered anymore. A click on "buttonGood" does not cause the problem.

有没有好的解决办法来解决这个问题呢？

Is there a good workaround to solve this problem?

这个解决办法似乎是太复杂了： <一href="http://forums.xamarin.com/discussion/20608/fix-for-button-layout-bug-on-android">http://forums.xamarin.com/discussion/20608/fix-for-button-layout-bug-on-android

This workaround seems to be too complicated: http://forums.xamarin.com/discussion/20608/fix-for-button-layout-bug-on-android

编辑： 一个编程编辑UI也病例的bug。更改 label.Text 在异步方法经过短暂的等待领导的buttonGood来调整其文字后点击错误的。

edit: A programatically edit of the UI also cases the bug. Changing the label.Text in an async method after a short waiting leads the "buttonGood" to align its text wrong after a click.

EDIT2： 我创建了一个例子/测试项目在GitHub上： <一href="https://github.com/perpetual-mobile/ButtonTextAlignmentBug.git">https://github.com/perpetual-mobile/ButtonTextAlignmentBug.git 对齐是正确的，当StackLayout被替换为AbsolutLayout，但我需要的StackLayout很好地工作。

edit2: I created an example / test project on GitHub: https://github.com/perpetual-mobile/ButtonTextAlignmentBug.git The alignment is correct, when the StackLayout is replaced by an AbsolutLayout, but i need the StackLayout to work well.

推荐答案

好了，处理这个愚蠢的错误了几个小时之后，我通过实现自定义渲染和覆盖解决它 ChildDrawableStateChanged ：

Ok, after hours of dealing with this silly bug, I resolved it by implementing a custom rendering and overriding ChildDrawableStateChanged:

public override void ChildDrawableStateChanged(Android.Views.View child) 
{
    base.ChildDrawableStateChanged(child); 
    Control.Text = Control.Text; 
}

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