SwiftUI：点击更改TectField背景颜色

Question

我是SwiftUI的新手，处于学习模式。

我正在研究允许用户从日历中选择日期的代码。日历中的每一天都由一个文本字段表示。我希望在点击时更改所选日期的文本字段的背景颜色。我可以在视图首次加载时更改背景，但是，我无法找到一种方法来在点击时进行更改。感谢您的帮助。

import SwiftUI

var selectDay: Int = 0

struct ContentView: View {

    @State var strDays = ["01","02","03","04","05","06","07"]

    var body: some View {

        VStack (spacing:10) {

            HStack (spacing: 2) {

                TextField("", text: $strDays[0])
                    .modifier(dayModifier())
                    .background(getBackgroundColor(thisDay: 0))
                    .onTapGesture {
                        self.selectDate(selection: 0)
                 }

                TextField("", text: $strDays[1])
                    .modifier(dayModifier())
                    .background(getBackgroundColor(thisDay: 1))
                    .onTapGesture {
                        self.selectDate(selection: 1)

                }

            }

        }

    }

    func selectDate(selection: Int) {
        strDays[selection] = "99"
        selectDay = selection
    }

    func getBackgroundColor(thisDay: Int) -> Color {

        var backgroundColor = Color.clear

        if selectDay == thisDay {
            backgroundColor = Color.blue
        }

    return backgroundColor

    }

struct dayModifier: ViewModifier {

     func body(content: Content) -> some View {

        return content
            .frame(width: 50.0, height: 50)
            .multilineTextAlignment(.center)
            .foregroundColor(.primary)
            .border(Color.primary, width: /*@START_MENU_TOKEN@*/1/*@END_MENU_TOKEN@*/)

            .disabled(true)

    }

}

Answer 1

根据代码的逻辑，您需要Text而不是TextField，因此请在下面的固定和有效快照中查找。

使用Xcode 11.4 / iOS 13.4测试

struct ContentView: View {

    @State var selectDay: Int = 0
    @State var strDays = ["01","02","03","04","05","06","07"]

    var body: some View {
        VStack (spacing:10) {
            HStack (spacing: 2) {
                Text(strDays[0])
                    .modifier(dayModifier())
                    .background(getBackgroundColor(thisDay: 0))
                    .onTapGesture {
                        self.selectDate(selection: 0)
                }

                Text(strDays[1])
                    .modifier(dayModifier())
                    .background(getBackgroundColor(thisDay: 1))
                    .onTapGesture {
                        self.selectDate(selection: 1)

                }
            }
        }
    }

    func selectDate(selection: Int) {
        strDays[selection] = "99"
        selectDay = selection
    }

    func getBackgroundColor(thisDay: Int) -> Color {
        var backgroundColor = Color.clear
        if selectDay == thisDay {
            backgroundColor = Color.blue
        }
        return backgroundColor

    }

    struct dayModifier: ViewModifier {
        func body(content: Content) -> some View {
            content
                .frame(width: 50.0, height: 50)
                .multilineTextAlignment(.center)
                .foregroundColor(.primary)
                .border(Color.primary, width: 1)
        }
    }
}