GPT4上手体验：让GPT写一个飞机大战游戏，编程能力直线提升

import SwiftUI
import AVFoundation

struct VolumeView: View {
  private var volume: Float = AVAudioSession.sharedInstance().outputVolume
 
 var body: some View {
 VStack {
 Slider(value: $volume, in: 0...1)
 .padding()
 Text("Volume: \(volume)")
 }
 .onAppear {
 let audioSession = AVAudioSession.sharedInstance()
 do {
 try audioSession.setActive(true)
 audioSession.addObserver(self, forKeyPath: "outputVolume", options: [.new], context: nil)
 } catch {
 print("Error setting up audio session: \(error)")
 }
 }
 .onDisappear {
 let audioSession = AVAudioSession.sharedInstance()
 audioSession.removeObserver(self, forKeyPath: "outputVolume")
 do {
 try audioSession.setActive(false)
 } catch {
 print("Error deactivating audio session: \(error)")
 }
 }
 }
 
 
 func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
 if keyPath == "outputVolume" {
 volume = AVAudioSession.sharedInstance().outputVolume
 }
 }
}

struct ContentView: View {
 var body: some View {
 VolumeView()
 }
}

import SwiftUI
import AVFoundation
import Combine

class VolumeMonitor: ObservableObject {
  var volume: Float = 0.0
 private var timer: Timer?
 private var audioSession: AVAudioSession

 init() {
 audioSession = AVAudioSession.sharedInstance()
 startMonitoring()
 }

 func startMonitoring() {
 timer = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true) { [weak self] _ in
 guard let self = self else { return }
 self.volume = self.audioSession.outputVolume
 }
 }

 func stopMonitoring() {
 timer?.invalidate()
 timer = nil
 }

 deinit {
 stopMonitoring()
 }
}

struct VolumeView: View {
  private var volumeMonitor = VolumeMonitor()

 var body: some View {
 VStack {
 Text(" 当前音量:")
 Text("\(volumeMonitor.volume, specifier: "%.2f")")
 .font(.largeTitle)
 }
 .padding()
 }
}

struct ContentView: View {
 var body: some View {
 VolumeView()
 }
}

@main
struct VolumeApp: App {
 var body: some Scene {
 WindowGroup {
 ContentView()
 }
 }
}