Swift中的字典

1 import Foundation  2
3 //字典的声明
4 var dic1: Dictionary <String,String>
5 var scores: [String:Int]  6 //然后是创建字典
7 dic1 = Dictionary<String,String>()  8 scores = Dictionary<String,Int>(minimumCapacity: 5)  9
10 var emptyDic: [String : Double] = [:]//空字典
11 println(emptyDic.isEmpty) 12
13 //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nil
19 person["name"] = "HeYang"
20 println(person["name"]!) 21
22 person["weight"] = 90
23 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 24
25 //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"] 30 if height_1 != nil { 31     println(height_1!) 32 } 33 //updateValue(value: Value, forKey: Key)
34 if 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"]!) 38
39 print("遍历：") 40 for (key,value) in person_1{ 41     print("\(key) : \(value) ") 42 } 43
44 println() 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)") 49
50 //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)")