Ios 如何在 SwiftUI 中只显示一次随机数组的项目

您可以这样做:

1. 当前选定人员的状态变量

@State Private var CurrerntPerson:字符串=""

2. 一个获取随机人的函数

GetRandomPeople()

3. 更改TextView显示选定人员姓名:

Text(currerntPerson)
   .font(.largeTitle)
   .bold()
   .foregroundColor(.white)
   .onAppear {
        GetRandomPeople()
   }

= 此处的所有代码:

let motionManager = CMMotionManager()
let queue = OperationQueue()
@State private var roll = Double.zero

@State private var people = ["John", "Marcus", "Steve", "Eric", "Philip"].shuffled()
@State private var randomPerson = Int.random(in: 0...4)

let timer = Timer.publish(every: 1, tolerance: 0.5, on: .main, in: .common).autoconnect()
@State private var timeRemaining = 10
@State private var score = 0
@State Private var CurrerntPerson:字符串=""

var body: some View {
    NavigationView {
        ZStack {
            //Show a red background and "SKIP" if the user raises head
            if roll < 1 {
                Color.red
                    .ignoresSafeArea()
                
                Text("SKIP")
                    .font(.largeTitle)
                    .bold()
                    .foregroundColor(.white)
            } else if roll > 2.1 {
                //Show a green background and "CORRECT" if user lowers head
                Color.green
                    .ignoresSafeArea()
                
                Text("CORRECT")
                    .font(.largeTitle)
                    .bold()
                    .foregroundColor(.white)
                    .onAppear {
                        score += 1
                    }
            } else {
                //Otherwise show a cyan back with array's name
                Color.cyan
                    .ignoresSafeArea()
                
                Text(currerntPerson)
                    .font(.largeTitle)
                    .bold()
                    .foregroundColor(.white)
                    .onAppear {
                        GetRandomPeople()
                    }
            }
            
            Text("\(timeRemaining)")
                .font(.system(size: 39))
                .padding(.bottom, 200)
                .onReceive(timer) { _ in
                    if timeRemaining > 0 {
                        timeRemaining -= 1
                    }
                }
            
            Text("Score: \(score)")
                .font(.largeTitle)
                .bold()
                .foregroundColor(.white)
                .padding(.top, 200)
        }
        .onAppear {
            //Detect device motion
            self.motionManager.startDeviceMotionUpdates(to: self.queue) { (data: CMDeviceMotion?, error: Error?) in
                guard let data = data else {
                    print("Error: \(error!)")
                    return
                }
                let attitude: CMAttitude = data.attitude
                
                DispatchQueue.main.async {
                    self.roll = attitude.roll
                }
            }
        }
    }
    .navigationViewStyle(.stack)
}

func GetRandomPeople() {
    if people.count > 0 {
        let index = Int.random(in: 0..<people.count)
        currerntPerson = people[index]
        people.remove(at: index)
    }
}