小编Jam*_*ond的帖子

为什么不能分配可选？

索引已分配，但仍未显示值

帮帮我，谢谢！

struct TestView: View {
    @State private var index: Int? = nil
    @State private var show: Bool = false
    
    var body: some View {
        VStack {
            Text("Hello, world!")
                .onTapGesture {
                    self.index = 1
                    self.show = true
                    print(self.index as Any)
                }
        }
        .fullScreenCover(isPresented: $show) {
            if let index = self.index {
                Text("value:\(index)")
            } else {
                Text("not value")
            }
        }
    }
}

Xcode 12.0 测试版 2