如果SwiftUI没有元素则删除按钮

Question

请帮助我，如果数组中没有元素，我无法禁用该按钮。我希望按钮在没有元素的情况下不会出现。我知道需要应用什么。禁用但我还无法实现它

import SwiftUI

struct TestModel {
    var text: String?
    var ansver: [String]
    var correctAnswer: String?
}

var test: [TestModel] = [
    
TestModel(text: "one", ansver: ["one", "two", "three", "four"], correctAnswer: "one"),
                                
TestModel(text: "five", ansver: ["five", "six", "seven", "eight"], correctAnswer: "five"),

TestModel(text: "nine", ansver: ["nine", "ten", "twelve"], correctAnswer: "nine") // 3 values 
]

如果删除一个值答案：[“九”，“十”，“十二”] /线程1：致命错误：索引超出范围

struct ContentView: View {
    @State var i: Int = 0
    @State var score = 0
    //@State var scoree = Bool()
    
    var body: some View {
        VStack {
            if(self.i < test.count) {
                Text(test[self.i].text!)
                
                
                Button(action: {
                    
                    self.buttonAction(n: "")
                }, label: {
                    Text((test[self.i].ansver[0]))
                    
                        .foregroundColor(.black)
                        .padding()
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .background(
                            RoundedRectangle(cornerRadius: 8)
                                .stroke(Color.blue,lineWidth: 2)
                        )
                })
                Button(action: {
                    self.buttonAction(n: "")
                }, label: {
                    Text((test[self.i].ansver[1]))
                    
                        .foregroundColor(.black)
                        .padding()
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .background(
                            RoundedRectangle(cornerRadius: 8)
                                .stroke(Color.blue,lineWidth: 2)
                        )
                })
                Button(action: {
                    self.buttonAction(n: "")
                }, label: {
                    Text((test[self.i].ansver[2]))
                    
                        .foregroundColor(.black)
                        .padding()
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .background(
                            RoundedRectangle(cornerRadius: 8)
                                .stroke(Color.blue,lineWidth: 2)
                        )
                })
                
                
                Button(action: {
                    self.buttonAction(n: "")
                        
                }, label: {
                    Text((test[self.i].ansver[3])) // Thread 1: Fatal error: Index out of range
                        .foregroundColor(.black)
                        .padding()
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .background(
                            RoundedRectangle(cornerRadius: 8)
                                .stroke(Color.blue,lineWidth: 2)
                            )
                    
                       })
                
            }
        }
        .padding()
        
    }
    func buttonAction( n: String){
        if(test[self.i].correctAnswer == n) {
            self.score = self.score + 1
        }
        self.i = self.i + 1
    }
    
}
struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

我试图做到这一点，但什么也没发生。大家好。