Swift字典

import UIKit

/*
和数组一样 
let: 表示不可变字典
var: 表示可变字典
*/

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        demo()
    }
    
    
    //字典
    //定义 OC: {}
    //Swift : [key : value]
    func demo() {
        var dict = ["name": "刘亦菲","age": 28]
        print(dict)
        
        //获取元素
        let name = dict["name"]
        print(name)
        
        //添加键值
        dict["height"] = 1.8
        print(dict)
        
        //修改键值
        dict["name"] = "林志玲"
        print(dict)
        
        //删除
        dict.removeValueForKey("age")
        print(dict)
        
        //遍历  OC中遍历字典 使用的是枚举 
        for (k,v) in dict {
            print("key = \(k)")
            print("value = \(v)")
        }
    }

}