Realm中@ObservedResults如何使用实例成员作为过滤条件？

Realm的@ObservedResults属性包装器可用于带过滤条件的数据查询，比如固定值过滤的场景：

@ObservedResults(Dog.self, where: { $0.weight > 40 }) var dogs

但当尝试引用视图实例的minWeight属性作为过滤条件时，会触发初始化顺序报错：

Cannot use instance member 'minWeight' within property initializer; property initializers run before 'self' is available

以下是除静态变量外的两种可行解决办法：

方案一：在初始化方法中手动初始化属性包装器 #

struct ExampleStruct: View {
    let minWeight: Int
    @ObservedResults(Dog.self) var dogs
    
    init(minWeight: Int) {
        self.minWeight = minWeight
        // 手动初始化属性包装器的存储属性，此时minWeight已完成初始化
        _dogs = ObservedResults(Dog.self, where: { $0.weight > minWeight })
    }
    
    var body: some View {
        List(dogs) { dog in
            Text("\(dog.name) - \(dog.weight)kg")
        }
    }
}

适用场景：minWeight是固定值，不会在视图生命周期内变化。

方案二：动态设置过滤条件（支持值更新） #

struct ExampleStruct: View {
    var minWeight: Int
    @ObservedResults(Dog.self) var dogs
    
    var body: some View {
        List(dogs) { dog in
            Text("\(dog.name) - \(dog.weight)kg")
        }
        .onAppear {
            // 视图初始化完成后，通过projected value动态设置过滤条件
            $dogs.where = { $0.weight > minWeight }
        }
        // 如果minWeight会动态变化，可添加监听实时更新过滤规则
        .onChange(of: minWeight) { newMin in
            $dogs.where = { $0.weight > newMin }
        }
    }
}

适用场景：minWeight可能在视图生命周期内动态变化，需要实时更新查询结果。

内容的提问来源于stack exchange，提问作者royB