SwiftUI属性装饰器（@EnvironmentObject）

一、简介

@EnvironmentObject和@ObservedObject类似；
只是model在视图内引入的方式不同

二、代码

// model
class EnvironmentShopEntity: ObservableObject {
    @Published var count: Int = 0
    
    func increase() {
        self.count += 1
    }
    
    func decrease() {
        if self.count > 0 {
            self.count -= 1
        }
    }
}

// 视图
struct EnvironmentShopView: View {
    // 使用@EnvironmentObject装饰model对象
    @EnvironmentObject var entity: EnvironmentShopEntity
    
    var body: some View {
        VStack {
            Text("商品个数: \(entity.count)").padding()
            Button(action: {
                self.entity.increase()
            }, label: {
                Text("增加")
            }).padding()
            Button(action: {
                self.entity.decrease()
            }, label: {
                Text("减少")
            }).padding()
        }
    }
}

// 使用视图
let entity = EnvironmentShopEntity()
EnvironmentShopView().environmentObject(entity)

三、实例

实例代码