1,字典 - Dictionary(即键值对)
var empty = [String: Int]() //建立个空字典 var myDic = ["name":"hangge","url":"hangge.com"] //声明一个字典 myDic["address"] = "china" //添加或修改key值 myDic.removeValueForKey("name") //删除"name"这个key值 myDic["name"] = nil //同样可以删除"name"这个key值 myDic.keys //访问字典的key集合 myDic.values //访问字典的values集合 //遍历字典 for (key,value) in myDic { print("\(key):\(value)"); } //只遍历字典的键(key) for key in myDic.keys { print("\(key)"); } //只遍历字典的值(value) for value in myDic.values { print("\(value)"); }
var types = ["none","warning","error"] //省略类型的数组声明 var menbers = [String]() //声明一个空数组 menbers.append("six") //添加元素 menbers += ["seven"] //添加元素 menbers.insert("one",atIndex:0) //指定位置添加元素 menbers[0] = "message" //通过下标修改数组中的数据 menbers[0...2] = ["message","hangge","com"] //通过小标区间替换数据(前3个数据) menbers.count //获取数组元素个数 menbers.isEmpty //判断数组是否为空 menbers.removeAtIndex(2) //删除下标为2的数组 menbers.removeLast() //删除最后一个元素 menbers.removeAll(keepCapacity:true) //删除数组中所有元素 let addStringArr = types + menbers //数组组合 //使用for in 实现数组遍历 for value in menbers{ print("\(value)"); } //通过enumerate函数同时遍历数组的所有索引与数据 for (index,value) in menbers.enumerate(){ print("索引:\(index) 数据:\(value)"); }
3,结构体 - struct
//创建一个结构体 struct BookInfo{ var ID:Int = 0 var Name:String = "Defaut" var Author:String = "Defaut" } var book1:BookInfo //默认构造器创建结构体实例 var book2 = BookInfo(ID:0021,Name:"航歌",Author:"hangge") //调用逐一构造器创建实例 book2.ID = 1234 //修改内部值
enum CompassPoint { case North case South case East case West } var directionToHead = CompassPoint.West enum Planet: Int { case Mercury = 1 case Venus = 2 case Earth = 3 } let earthsOrder = Planet.Earth.rawValue //rawValue来获取他的原始值:3 let possiblePlanet = Planet(rawValue: 2) //通过原始值来寻找所对应的枚举成员:Venus enum Direction { case Up case Down func description() -> String{ switch(self){ case .Up: return "向上" case .Down: return "向下" } } } print(Direction.Up.description())转自:http://www.hangge.com/blog/cache/detail_515.html 原文链接:https://www.f2er.com/swift/323855.html