SwiftUI：audioPlayer开始播放后，当可选的Bool = true时，if/else中的视图不起作用

smdncfj3 于 2022-10-31 发布在 Swift

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代码和调试：https://i.stack.imgur.com/PxsWn.jpg
我正在尝试使用.isPlaying来检查我的audioPlayer当前是否正在播放。我所期望的是在音频未播放时看到“播放”，如果音频正在播放则看到“暂停”。
我尝试过：在我的模拟器中，我点击了“是否正在播放音频”来验证audioPlayer？.isPlaying最初是否为false，然后点击“播放”来播放音频。之后，我再次点击了“是否正在播放音频”，audioPlayer？.isPlaying = true。
即使audioPlayer？.isPlaying = true，“暂停”按钮也没有出现。有人知道为什么吗？

import SwiftUI
import AVKit

struct aNote: View {
    @State private var audioPlayer: AVAudioPlayer!
    var body: some View {
        VStack {
            if audioPlayer?.isPlaying ?? false {
                Button(action: {self.audioPlayer.pause()}, label: {Text("PAUSE")})
            } else {Button(action: {self.audioPlayer.currentTime = 0; self.audioPlayer.play()}, label: {Text("PLAY")})
            }
            Button(action: {print(audioPlayer?.isPlaying)}, label: {Text("Is the audio playing")})
        }
        .onAppear {
            let sound = Bundle.main.path(forResource: "A#", ofType: "mp3")
            self.audioPlayer = try! AVAudioPlayer(contentsOf: URL(fileURLWithPath: sound!))
        }
    }
}

swift

来源：https://stackoverflow.com/questions/74143968/swiftui-when-optional-bool-true-after-audioplayer-starts-playing-views-in-if

1条答案

按热度按时间

vaj7vani1#

谢谢@jnpdx！下面是我的工作，我使用了一个计时器（withTimeInterval =音频的持续时间）来更新Bool的isAudioPlaying

class NewAudioControl: ObservableObject {
    var audioPlayer: AVAudioPlayer!
    @Published var isAudioPlaying = false

    func playSound(filename: String, duration: Double) {
        let sound = Bundle.main.path(forResource: filename, ofType: "mp3")
        self.audioPlayer = try! AVAudioPlayer(contentsOf: URL(fileURLWithPath: sound!))
        self.audioPlayer.play()
        isAudioPlaying = audioPlayer.isPlaying
        Timer.scheduledTimer(withTimeInterval: duration, repeats: false) { [self]_ in isAudioPlaying = audioPlayer.isPlaying}
    }

    func pauseSound() {
        self.audioPlayer.pause()
        self.audioPlayer.currentTime = 0
        isAudioPlaying = audioPlayer.isPlaying
    }
}

struct noteA: View {
    @ObservedObject var newAudioControl = NewAudioControl()
    var body: some View {
        if newAudioControl.isAudioPlaying {Button(action: {newAudioControl.pauseSound()}, label: {ButtonView(buttonColour: "noteText", noteColour: "noteButton", note: "A")})
        } else {Button(action: {newAudioControl.playSound(filename: "A", duration: 28.0)}, label: {ButtonView(buttonColour: "noteButton", noteColour: "noteText", note: "A")})
        }
    }
}

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SwiftUI：audioPlayer开始播放后，当可选的Bool = true时，if/else中的视图不起作用

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