Swift 属性装饰器

最新推荐文章于 2025-05-23 09:16:47 发布

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最新推荐文章于 2025-05-23 09:16:47 发布

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文章标签： python 动态规划 swift 图论 leetcode

本文链接：https://blog.youkuaiyun.com/m0_55782613/article/details/122872716

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import ArgumentParser

@propertyWrapper
struct WrapperTest {
    internal var innerValue: Int {
        didSet {
            print("didSet called \(oldValue)")
        }
        willSet {
            print("willSet called \(newValue)")
        }
    }
    public var wrappedValue: Int {
        get {
            return innerValue
        }
        set {
            innerValue = min(50, newValue)
            print("setter called")
        }
    }
    // 装饰器的初始化器，可以初始默认值
    init(wrappedValue initialValue: Int) {
        self.innerValue = 0
        self.wrappedValue = initialValue
    }
}

struct WrapperTestDemo {
    @WrapperTest(wrappedValue: 55) var demo1: Int
    @WrapperTest() var demo2: Int = 88
}

let demo = WrapperTestDemo()
print(demo.demo1)
print(demo.demo2)