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                ### 1.4屬性 Kivy介紹了一種新的在一個類中生命屬性的方法,以前的方式為: ```Python class MyClass(object): def __init__(self): super(MyClass, self).__init__() self.numeric_var = 1 ``` 而Kivy的方式為: ```Python class MyClass(eventDispatcher): numeric_var = NumericProperty(1) ``` 這些屬性實現了[觀察者模式](http://en.wikipedia.org/wiki/Observer_pattern),它們對你有以下幫助: * 更容易操縱定義在[Kv 語言]中的部件 * 自動監控任何的變動,并且執行相應的代碼 * 檢查刷新屬性值 * 優化內存管理 為了使用屬性,**你必須在一個類里面聲明它們**,注意是直接寫在類里面,而不是寫在任何的類的方法里,它是一個類屬性。每一個屬性都默認提供了一個on_<propertyname\>事件;當屬性值的狀態和屬性值發生改變時該事件均會被調用。 Kivy提供了下列的屬性: * [NumericProperty](https://kivy.org/docs/api-kivy.properties.html#kivy.properties.NumericProperty) * [StringProperty](https://kivy.org/docs/api-kivy.properties.html#kivy.properties.StringProperty) * [ListProperty](https://kivy.org/docs/api-kivy.properties.html#kivy.properties.ListProperty) * [ObjectProperty](https://kivy.org/docs/api-kivy.properties.html#kivy.properties.ObjectProperty) * [BooleanProperty](https://kivy.org/docs/api-kivy.properties.html#kivy.properties.BooleanProperty) * [BoundedNumericProperty](https://kivy.org/docs/api-kivy.properties.html#kivy.properties.BoundedNumericProperty) * [OptionProperty](https://kivy.org/docs/api-kivy.properties.html#kivy.properties.OptionProperty) * [ReferenceListProperty](https://kivy.org/docs/api-kivy.properties.html#kivy.properties.ReferenceListProperty) * [AliasProperty](https://kivy.org/docs/api-kivy.properties.html#kivy.properties.AliasProperty) * [DictProperty](https://kivy.org/docs/api-kivy.properties.html#kivy.properties.DictProperty) 如果想有更深的了解,請查看[屬性](https://kivy.org/docs/api-kivy.properties.html) ### 下節預告:1.5 Kv設計語言
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