不多說上圖

截屏2020-03-30 16.48.10.png

這是個在同一個視圖中可以選擇你想顯示的視圖

struct ActivityView: View {
    @ObservedObject var ActivityDatas : ActivityData
    @State var Way = 0
    var WithDrawType = ["積分折扣", "積分隨機減","積分比例贈"] 
    var body: some View {
        
        VStack{
            Picker(selection: $Way, label: Text("")) {
                ForEach(0..<WithDrawType.count) { index in
                    Text(self.WithDrawType[index]).tag(index)
                    
                }
            }.pickerStyle(SegmentedPickerStyle()) //picker的樣式
                
            Spacer().frame(height:0)
            
//下面通過if else來切換你想顯示的View
            if WithDrawType[Way] == "積分折扣"{
                
                Activity1(index: 0, ActivityData: ActivityDatas)
                
            }else if WithDrawType[Way] == "積分隨機減"{
               Activity2(index: 0, ActivityData: ActivityDatas)
            }else {
                Activity3(index: 0, ActivityData: ActivityDatas)
            }
            
           
        }

1.定一個數(shù)組用來遍歷出要顯示title
2.WithDrawType[Way]這樣可獲得，當你點擊一個選項時獲取其中選項的值，這樣就可以判斷出你要顯示的View