Swift 字典

- 字典定义

        let dict:[String : Any] = ["name": "王", "age": 18];
        print(dict)
        
        // [Dictionary<String, Any>]
        let array = [["name": "李", "age": 22],
                     ["name": "王", "age": 18]]
        print(array)

- 增删改

        var dict:[String : Any] = ["name": "王", "age": 18, "title": "BOSS"]
        print(dict)
        
        // 增加
        dict["height"] = 1.7
        print(dict)
        
        // 修改
        dict["name"] = "老李"
        print(dict)
        
        // 删除
        dict.removeValue(forKey: "title")

- 遍历

        let dict:[String : Any] = ["name": "王", "age": 18, "title": "BOSS"]
        for s in dict {
            print(s)
        }
        
        print("----1------")
        
        // let s: (key: String, value: Any)
        for s in dict {
            print("(s.key)  (s.value)")
        }
        
        print("------2----")
        for (s, v) in dict {
            print("(s) -- (v)")
        }

- 合并

        var dict1 = ["name": "王", "age": 18] as [String : Any]
        let dict2 = ["name": "老李", "title": "BOSS"]
        
        for (k, v) in dict2 {
            dict1[k] = v
        }
        print(dict1)