swift-字典

//创建一个空字典:key:int,value:string

  var nameOfintegers = [Int:String]();

//字面量创建

        var airports:[String:String] = ["yyz":"tiribtciyb","zzy":"dddd"];

//访问和修改字典

       //自定键值队数量
        print(airports.count);
        //使用是否为空isEmpty;

        //添加一个键值队
        airports["aaa"] = "Kibdib";

        //根据键值队来改变特定值
        airports["LHR"] = "london heathrow";

//遍历

 for (airportcode,airportName) in airports {

            print("\(airportcode):\(airportName)");
        }
 //通过keys或者values属性
        for airporcode in airports.keys {

            print("airport code:\(airporcode)");
        }
        //通过value获取属性
        for airportcode in airports.keys {

            print("aipotr code:\(airportcode)");
        }

//获取键值对

        //获取键
        let airportCodes = [String](airports.keys)
        //获取值
        let airportNames = [String](airports.values)