不能设置按钮颜色

Question

基于这个UI示例，我在on_start方法的末尾添加了一个自定义按钮。但当我运行游戏按钮体是无形的，只有它的文本显示("1234567")。

我添加到示例中的代码：

// ...

use amethyst::assets::AssetStorage;
use amethyst::assets::Handle;
use amethyst::assets::Loader;
use amethyst::renderer::loaders::load_from_srgba;
use amethyst::renderer::palette::Srgba;
use amethyst::renderer::Texture;
use amethyst::renderer::types::TextureData;
use amethyst::ui::Anchor;
use amethyst::ui::UiButtonBuilder;
use amethyst::ui::UiImage;

// ...

impl SimpleState for Example {
    fn on_start(&mut self, data: StateData<'_, GameData<'_, '_>>) {
        // ...

        let texture_handle: Handle<Texture> = {
            let loader = world.read_resource::<Loader>();
            let texture_assets = world.read_resource::<AssetStorage<Texture>>();
            let texture_builder = load_from_srgba(Srgba::new(0.8, 0.6, 0.3, 1.0));
            loader.load_from_data(TextureData::from(texture_builder), (), &texture_assets)
        };

        let button = UiButtonBuilder::<(), u32>::new("1234567".to_string())
            .with_id(666)
            .with_font_size(12.0)
            .with_position(64.0, -64.0)
            .with_size(64.0 * 3.0, 64.0)
            .with_anchor(Anchor::TopMiddle)
            // HAS NO EFFECT
            .with_image(texture_handle)
            // HAS NO EFFECT
            .with_hover_image(UiImage::SolidColor([0.1, 0.1, 0.1, 0.5]))
            .with_layer(12.0)
            .build_from_world(&world);

        world.insert(button);
    }
}

// ...

什么是正确的方法来创建一个按钮在飞行与自定义颜色？

我用的是紫水晶。

​

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Answer 1

UiButtonBuilder中有一个bug。我刚刚创建了这个问题：https://github.com/amethyst/amethyst/issues/2298