SwiftUI 基础之Toggle控件与@Binding属性装饰器（含代码demo）

Toggle 介绍

A control that toggles between on and off states.

在打开和关闭状态之间切换的控件

大白话：状态开关

@Binding 属性装饰器

A manager for a value that provides a way to mutate it.

值的管理器，提供了一种对其进行变异的方法

大白话：将一个变量从不可以修改，转化为可以修改。而且是可以跨视图修改。就是将变量的引用传给其他的视图

Toggle和@Binding联合demo

我们做一个开关来控制列表中数据的显示

import SwiftUI

struct Product : Identifiable{
    let id = UUID()
    let title:String
    let isFavorited:Bool
}
struct FilterView: View {
    @Binding var showFavorited: Bool

    var body: some View {
        Toggle(isOn: $showFavorited) {
            Text("Change filter")
        }
    }
}

struct ContentView: View {
    
    let products: [Product] = [
        Product(title:"abc1",isFavorited: true),
        Product(title:"abc2",isFavorited: true),
        Product(title:"abc3 false",isFavorited: false),
        Product(title:"abc4",isFavorited: true),
        
    ]
    
    @State private var showFavorited: Bool = false
    
    var body: some View {
        List {
           FilterView(showFavorited: $showFavorited)
            
            ForEach(products) { product in
                if !self.showFavorited || product.isFavorited {
                    Text(product.title)
                }
            }
        }
    }
    
    
}

效果

Jietu20200118-212714.gif

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