Question

我正在尝试使用SwiftUI构建一个简单的小游戏。我要在下面的代码中执行的操作是，每当第二个计时器倒计时时，resimler数组的成员之一（由resim1..resim9组成）就会更改为值“ mavis”，该值是图像的名称在图书馆。

当我打印（重新模拟）时，从输出中可以看到该数组中的随机元素的值为“ mavis”，那里没有问题。但是体内的相关image（）不会在模拟器中显示该图像。

例如： [“”，“ mavis”，“”，“”，“”，“”，“”，“”，“”]

我看到登录结果，但是Image（resim2）没有显示图像。

如何获取它以显示图像？

谢谢！

struct level1: View {

@State var resim1 = ""
@State var resim2 = ""
@State var resim3 = ""
@State var resim4 = ""
@State var resim5 = ""
@State var resim6 = ""
@State var resim7 = ""
@State var resim8 = ""
@State var resim9 = ""

 @State var timecounter = 5
 var timer = Timer.publish(every: 1, on: .main, in: .common).autoconnect()

func findMavis() {

    var resimler =  [self.resim1 , self.resim2 , self.resim3 , self.resim4 , self.resim5 , self.resim6 , self.resim7 , self.resim8 , self.resim9 ]

    let randomResim = Int(arc4random_uniform(UInt32(resimler.count - 1)))
    resimler[randomResim] = "mavis"
}
var body: some View {
VStack {

       Text("\(timecounter) seconds remaining").padding(.bottom, 50).onReceive(timer) { input in self.timecounter -= 1

              // the functions in this area will work every second
                     self.findMavis()

          // the functions after this will work after the timer stops
        if self.timecounter == 0 {
            self.timer.upstream.connect().cancel()



            }
        }
  HStack {
    Image(resim1).resizable()
            .frame(width: 100.0, height: 100.0).cornerRadius(50).onTapGesture {

                if self.resim1 == "mavis" {
                    self.scoreUp() }
        }
            Image(resim2).resizable()
            .frame(width: 100.0, height: 100.0).cornerRadius(50).onTapGesture {
            if self.resim2 == "mavis" {
                                   self.scoreUp() }
        }
        Image(resim3).resizable()
        .frame(width: 100.0, height: 100.0).cornerRadius(50).onTapGesture {
             if self.resim3 == "mavis" {
                                   self.scoreUp() }
        }
    }
  HStack {
    Image(resim4).resizable()
        .frame(width: 100.0, height: 100.0).cornerRadius(50).onTapGesture {
             if self.resim4 == "mavis" {
                                   self.scoreUp() }
        }
        Image(resim5).resizable()
        .frame(width: 100.0, height: 100.0).cornerRadius(50).onTapGesture {
             if self.resim5 == "mavis" {
                                   self.scoreUp() }
        }
        Image(resim6).resizable()
        .frame(width: 100.0, height: 100.0).cornerRadius(50).onTapGesture {
             if self.resim6 == "mavis" {
                                   self.scoreUp() }
           }
    }
   HStack {
          Image(resim7).resizable()
        .frame(width: 100.0, height: 100.0).cornerRadius(50).onTapGesture {
             if self.resim7 == "mavis" {
                                   self.scoreUp() }
        }
        Image(resim8).resizable()
        .frame(width: 100.0, height: 100.0).cornerRadius(50).onTapGesture {
             if self.resim8 == "mavis" {
                                   self.scoreUp() }
        }
        Image(resim9).resizable()
        .frame(width: 100.0, height: 100.0).cornerRadius(50).onTapGesture {
             if self.resim9 == "mavis" {
                                   self.scoreUp() }
        }
    }


 }
 }
 }

Answer 1

也许您应该阅读Swift入门教程，如何分配变量...

通过：

var resimler =  [self.resim1 , self.resim2 , self.resim3 , self.resim4 , self.resim5 , self.resim6 , self.resim7 , self.resim8 , self.resim9 ]

    let randomResim = Int(arc4random_uniform(UInt32(resimler.count - 1)))
    resimler[randomResim] = "mavis" // this line is your error

您不要更改自己。resim1-9-此错误指向此行的变量。

您可以将数组更改为@State变量，然后直接在数组中更改值，然后在Image中使用这些值，例如：Image（resilmer [0]），依此类推...。

尝试一下：（尽管我不知道您想做什么...。但是代码是“有效的”，并且不像意大利面条

struct ContentView: View {

    @State var timecounter = 5
    @State var score = 0

    var timer = Timer.publish(every: 1, on: .main, in: .common).autoconnect()

    func scoreUp() {
        score = score + 1
    }

    @State var resimler : [String] = ["","","","","","","","",""]

    func findMavis() {

        let randomResim = Int(arc4random_uniform(UInt32(resimler.count - 1)))
        self.resimler[randomResim] = "circle.fill"
    }
    var body: some View {
        VStack {
            Text("Score: \(score)")
                .font(Font.largeTitle)
            Text("\(timecounter) seconds remaining").padding(.bottom, 50).onReceive(timer) { input in self.timecounter -= 1

                // the functions in this area will work every second
                self.findMavis()

                // the functions after this will work after the timer stops
                if self.timecounter == 0 {
                    self.timer.upstream.connect().cancel()

                }
            }
            ForEach (0..<9) {index in
                Image(systemName:self.resimler[index]).resizable()
                    .frame(width: 100.0, height: 100.0).cornerRadius(50).onTapGesture {

                        if self.resimler[index] == "circle.fill" {
                            self.scoreUp() }
                }
            }
        }
    }
}

SWIFTUI-如何更改数组中随机变量的值？

1 个答案: