swift字典
/*
1. 定义
2. 增删改
3. 遍历
4. 合并
*/
class ViewController: UIViewController
{
override func viewDidLoad()
{
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
demo4()
}
// 4. 合并
func demo4()
{
var dic1 = ["name":"tang", "age":12] as [String:Any]
let dict2 = ["name":"mo","height":15] as [String:Any]
// 思路遍历dic2 依次设置
// 如果key存在,修改
// 如果key不存在,新增
for e in dict2
{
dic1[e.key] = e.value
}
print("dic1=\(dic1)")
}
// 3. 遍历
func demo3()
{
let dic = ["name":"tngang", "age":14, "title":"hhh"] as [String:Any]
for e in dic
{
print("key=\(e.key); value=\(e.value)")
}
print("----------------")
/**
前面的是key
后面的是value
具体的名字可以随便
*/
for (key, value) in dic
{
print("key=\(key); value=\(value)")
}
}
// 2. 增删改
func demo2()
{
// 可变var / 不可变let
var dic = ["name":"tang", "age":14] as [String:Any]
// 新增 - 如果Key不存在,就是新增
dic["title"] = "太热了"
print("dic=\(dic)")
// 修改 - 字典中,是通过key取值,在字典中必须是唯一的
dic["name"] = "moyongmei"
print("dic=\(dic)")
// 删除 通过键进行删除
// hash 就是将字符串编程唯一的‘整数’便于查找,提高字典遍历速度
dic.removeValue(forKey: "age");
print("dic=\(dic)")
}
// 1. 定义
func demo1()
{
// OC 定义字典,是用{}
// Swift 使用[]
let dict: [String:Any] = ["name":"tang","age":18]
print("dict=\(dict)")
// 定义字典的数组 - 提示,这种格式在开发中使用的最多
let array: [[String:Any]] = [
["name":"tang","age":14],
["name":"bin","age":18]
]
print("array=\(array)")
}
}
posted on 2017-07-28 14:18 TangBin604 阅读(80) 评论(0) 编辑 收藏 举报