Swift中的字典

             1
            import Foundation

             2
             3
            //
            字典的声明
             4 var dic1: Dictionary <String,String>
 5var scores: [String:Int]
 6//然后是创建字典 7 dic1 = Dictionary<String,String>()
 8 scores = Dictionary<String,Int>(minimumCapacity: 5)
 910 var emptyDic: [String : Double] = [:]//空字典11println(emptyDic.isEmpty)
1213//通过常量和变量决定字典是否可变14 var person = [  "age":18,
15"name":"heyang",
16"身高":178]
17 println(person["age"]!)
18 println(person["weight"])//不存在的key，返回为nil19 person["name"] = "HeYang"20 println(person["name"]!)
2122 person["weight"] = 9023 println("字典是无序的：\(person)")//对不存在的key设置value，字典将会添加key－value对
2425//var height: Int? = person["身高"]会报错,原因是person的元素都是NSObject所以上面的字典person是不严谨的26 var person_1 = ["age":"18",
27"name":"heyang",
28"身高":"178"]
29 var height_1: String? = person_1["身高"]
30if height_1 != nil {
31     println(height_1!)
32}
33//updateValue(value: Value, forKey: Key)34if let oldName = person_1.updateValue("180", forKey: "身高"){
35     println("原来的值是：\(oldName)")
36}
37 println("现在的值是："+person_1["身高"]!)
3839 print("遍历：")
40for (key,value) in person_1{
41     print("\(key) : \(value)    ")
42}
4344println()
45//字典删除的方法46 person.removeAll(keepCapacity: false)
47 person_1.removeValueForKey("身高")
48 println("删除之后person：\(person) 和 person_1:\(person_1)")
4950//取出字典当中的键值对51 let keysArr = [String](person_1.keys)
52 let valuesArr = [String](person_1.values)
53 println("keysArr: \(keysArr)")
54 println("valuesArr: \(valuesArr)")