swift ui 语法基础

import SwiftUI

struct StudyView: View {
    @State var show = false // 动态改变的变量前面需要声明[@State]
    var name = "字符串123" // 静态的变量不需要加[@State]
    
    var body: some View {
        VStack {
            Toggle("切换", isOn: $show) // 控件与变量绑定需要加[$]
            Text("这里是变量：\(name)").opacity(show ? 1 : 0)
            Spacer() // 用于排版，自适应推开组件
        }
        .padding()
    }
}

struct StudyView_Previews: PreviewProvider {
    static var previews: some View {
        StudyView()
    }
}