Swift中的字典

//1.创建字典

var dict:Dictionary<Int, String> = [:“美国“,1:“中国“, 2:“英国“]

var country = [

“china”: “中国“,

“en”:“英国“,

“usa”:“美国“

]

//创建一个空的字典

var emptyDictionary = Dictionary<String, Float>()

var emptyDictionary2 = [:]

for (key,value) incountry {

var result = key + value

}

//2.获取字典中的所有键名和键值及字典元素个数

var keys = Array(country.keys)

var values = Array(country.values)

var cnum = country.count

//3.访问字典

var value = dict[]

var value2 = country[“china”]

//4.修改字典,修改后，字典中的位置会发生改变

country[“china”] = “中华人民共和国”

country.updateValue(“美国大兵“, forKey:“usa”)

for i incountry.values {

var name = i

}

//5.删除字典元素

country[“usa”] = nil

country.removeValueForKey(“en”)

for (key,value) incountry {

var result = key + value

}

• Swift