SwiftUI SegmentedControl

问题描述

我有一个带有两个选项的分段控件。我想根据选择器索引显示不同的视图。但是由于某些原因，我会收到警告：

“ PersonalAddressView”初始化程序的结果未使用

和

“ CorporateAddressView”初始化程序的结果未使用

struct AddressSegment : View {
    @State private var selectorIndex = 0
    @State private var options = ["Bireysel","Kurumsal"]
    init() {
        UISegmentedControl.appearance().selectedSegmentTintColor = #colorLiteral(red: 0.05490196078,green: 0.3254901961,blue: 0.368627451,alpha: 1)
        UISegmentedControl.appearance().setTitleTextAttributes([.foregroundColor: UIColor.white],for: .selected)
        UISegmentedControl.appearance().setTitleTextAttributes([.foregroundColor: UIColor.init(displayP3Red: 0.05490196078,alpha: 1)],for: .normal)
    }
    var body: some View {
        vstack {
            Picker("Addresses",selection: $selectorIndex) {
                ForEach(0..<options.count) { index in
                    Text(self.options[index]).tag(index)
                }
            }
            .onReceive([self.selectorIndex].publisher.first(),perform: { value in
                if value == 0 {
                    PersonalAddressView()
                } else {
                    CorporateAddressView()
                }
            })
            .pickerStyle(SegmentedPickerStyle())
            .frame(width: 216,height: 28,alignment: .center)
            .cornerRadius(5)
            .foregroundColor(.white)
        }
    }
}

我想要的是下面的

解决方法

您需要在ViewBuilder块内创建视图，而不是在诸如onReceive之类的函数中创建视图。

尝试以下操作：

struct AddressSegment : View {
    @State private var selectorIndex = 0
    @State private var options = ["Bireysel","Kurumsal"]
    init() {
        UISegmentedControl.appearance().selectedSegmentTintColor = #colorLiteral(red: 0.05490196078,green: 0.3254901961,blue: 0.368627451,alpha: 1)
        UISegmentedControl.appearance().setTitleTextAttributes([.foregroundColor: UIColor.white],for: .selected)
        UISegmentedControl.appearance().setTitleTextAttributes([.foregroundColor: UIColor.init(displayP3Red: 0.05490196078,alpha: 1)],for: .normal)
    }
    var body: some View {
        VStack {
            Picker("Addresses",selection: $selectorIndex) {
                ForEach(0..<options.count) { index in
                    Text(self.options[index]).tag(index)
                }
            }
            .pickerStyle(SegmentedPickerStyle())
            .frame(width: 216,height: 28,alignment: .center)
            .cornerRadius(5)
            .foregroundColor(.white)

            // move the code here,to the ViewBuilder block
            if selectorIndex == 0 {
                PersonalAddressView()
            } else {
                CorporateAddressView()
            }
        }
    }
}