Swift中的字典

import Foundation

//字典的声明
var dic1: Dictionary <String,String>
var scores: [String:Int]
//然后是创建字典
dic1 = Dictionary<String,String>()
scores = Dictionary<String,Int>(minimumCapacity: 5)

var emptyDic: [String : Double] = [:]//空字典
println(emptyDic.isEmpty)

//通过常量和变量决定字典是否可变
var person = [  "age":18,
"name":"heyang",
"身高":178]
println(person["age"]!)
println(person["weight"])//不存在的key，返回为nil
person["name"] = "HeYang"
println(person["name"]!)

person["weight"] = 90
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

//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
var person_1 = ["age":"18",
"name":"heyang",
"身高":"178"]
var height_1: String? = person_1["身高"]
if height_1 != nil {
println(height_1!)
}
//updateValue(value: Value, forKey: Key)
if let oldName = person_1.updateValue("180", forKey: "身高"){
println("原来的值是：\(oldName)")
}
println("现在的值是："+person_1["身高"]!)

print("遍历：")
for (key,value) in person_1{
print("\(key) : \(value)    ")
}

println()
//字典删除的方法
person.removeAll(keepCapacity: false)
person_1.removeValueForKey("身高")
println("删除之后person：\(person) 和 person_1:\(person_1)")

//取出字典当中的键值对
let keysArr = [String](person_1.keys)
let valuesArr = [String](person_1.values)
println("keysArr: \(keysArr)")
println("valuesArr: \(valuesArr)")