DynamicProperty vs MutableProperty vs AnyProperty vs ConstantsProperty

Question

他們之間有什么區別？ 你能舉個例子說明我應該使用dynamic / mutable / any / constants屬性嗎？

Answer 1

你的所有答案都在這個鏈接Property.swift

我舉幾個例子：

let privatString = MutableProperty<String>("PrivatString")
    // AnyProperty are only for observing. You can't change it with observableProperty.value
    let observableProperty: AnyProperty = AnyProperty<String>(privatString)

    print(observableProperty)

    // ConstantProperty describes observable constant value.
    let constantProperty = ConstantProperty<String>("ConstantString")
    //  constantProperty.value = "" Error

    // Thread safe observable mutable property. It's value is changable
    let mutableProperty = MutableProperty<String>("mutableProperty")
    mutableProperty.value = "New mutable property value"

    // DynamicProperty uses KVO. 
    let dynamicProperty = DynamicProperty(object: self.view.layer, keyPath: "bounds")
    dynamicProperty.producer.startWithNext { frame in
        let frame = frame as! NSValue
        let rect = frame.CGRectValue()
        print(rect)
    }