外观更改时更新小部件 [英] Update Widget when appearance changes

问题描述

当外观从 light 模式更改为 dark 模式，反之亦然时，我需要知道是否有人知道SwiftUI中的系统来更新Widget.

I would need to know if any of you know a system in SwiftUI to update a Widget when the appearance changes from light mode to dark mode and vice versa.

我可以更改文本和图像，但是我使用一种方法来显示地图的屏幕快照，因此每次外观更改时都应运行它以获取正确的地图颜色.

I can change text and images but I use a method to display a screenshot of a map and I should run it every time the appearance changes to get the correct map color.

推荐答案

1. 创建两个屏幕截图(每个主题一个)，并将其传递给条目:

struct SimpleEntry: TimelineEntry {
    let date: Date
    let mapScreenshots: [ColorScheme: Image]
}

struct Provider: TimelineProvider {
    ...

    func getTimeline(in context: Context, completion: @escaping (Timeline<SimpleEntry>) -> Void) {
        let entry = SimpleEntry(
            date: Date(),
            mapScreenshots: [
                // replace with actual map screenshots
                .dark: Image(systemName: "plus"),
                .light: Image(systemName: "minus"),
            ]
        )
        let timeline = Timeline(entries: [entry], policy: .never)
        completion(timeline)
    }
}

1. 使用 @Environment(\.colorScheme)对主题更改做出反应:

1. Use @Environment(\.colorScheme) to react to theme changes:

struct WidgetEntryView: View {
    @Environment(\.colorScheme) var colorScheme

    var entry: Provider.Entry

    var body: some View {
        if let screenshot = entry.mapScreenshots[colorScheme] {
            screenshot
        }
    }
}

• iOS 14小部件检测系统主题更改

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