在SwiftUI应用中将音频播放代码放置在何处 [英] Where to place code for audio playback in a SwiftUI app

问题描述

在基于SwiftUI的应用中(即没有UIViewController类)将音频播放代码放置在哪里的最佳位置是什么?我要播放的声音是由视图启动的，因此我正在考虑将其放入相应的视图模型类中.但是由于模型类是关于数据的，所以我认为应该有一个更好的选择.最好的架构是什么?

Where is the best place to put code for audio playback in a SwiftUI based app, i.e. not having UIViewController classes? The sound I want to play is initiated by a view, so I'm thinking of putting it into the corresponding view model class. But as a model class is about data, I think there should be a better option. What's the best architecture?

推荐答案

正确，视图不应该处理数据. SwiftUI会强制执行此逻辑.

Correct, the View shouldn't take care of data. And SwiftUI enforces this logic.

您可以创建一个播放器类，该类负责播放音频.并将其添加为EnvironmentObject，以便您可以通过View中的按钮进行控制.然后，您可以做一些有趣的事情，例如绑定播放按钮，以根据播放器是否正在播放:)

You could create a Player class which takes care of playing the audio. And add it as an EnvironmentObject, so you can control it with your button in the View. You can then do sweet things like binding your play button to show different images depending on whether the player is... playing :)

更新 Xcode 11 beta 4的代码已更新(用willChange代替didChange)

Update Code has been updated for Xcode 11 beta 4 (willChange instead of didChange)

struct PlayerView : View {
    @EnvironmentObject private var player: Player

    var body: some View {
        Button(action: {
            self.player.pauseOrPlay()
        }) {
            Image(systemName: player.isPlaying ? "pause.circle.fill" : "play.circle.fill").font(.title).frame(minWidth: 44, minHeight: 44)
        }
    }
}

class Player: BindableObject {
    let willChange = PassthroughSubject<Player, Never>()

    var isPlaying: Bool = false {
        willSet {
            willChange.send(self)
        }
    }

    func pauseOrPlay() {
        // Code that toggles the audio on and off
    }
}

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