我创建了一个swift类来测试字典。所以，我写了下面的代码:importFoundationclassMyClass{varmyFirstDictionary:[String:String]varmyThirdDictionary:[String:String]?init(){varmySecondDictionary:[String:String]=[String:String]()mySecondDictionary["animal"]="Monkey"mySecondDictionary.updateValue("something",forKey:"SomeKey")self.