iOS Swift基础知识代码

推荐：Swift学习使用知识代码软件

//集合类型 数组 字典

    func array1(){

        var arr = ["","","","dd"]

        //简单写法

        var arr1 = ["","ee"]

        //数组拼接 数组

        var arr3 = arr + arr1

        //数组拼接 字符串

        arr3.append("")

        arr3 += ["",""]

        print(arr3)

        //插入数据

        arr3.insert("", at: )

        //获取数组中的数据

        let str1 = arr3[]

        print(str1)

        //改变 数据

        arr3[] = "rrr"

        //改变多个

        arr3[...] = ["","",""]

        //删除数据

        let strremo = arr3.remove(at: ) // strrmo = 删除的数据

        arr3.removeLast()

        arr3.removeFirst()

        arr3.removeAll()

        //遍历

        arr3 += ["rr","ee","eww"]

        for strr in arr3 {

            print(strr)

        }

    }

//字典

    func dict()  {

        //创建 字典key value 可以是任意基本类型int string double bool

        var dic1 = ["key" : "value","key1" : "value2"]

        var dict2 = [ : "eer" ,  : "err"]

        //创建一个空字典

        var kong = Dictionary<Int,String>()

        kong[] = ""

       print(kong)

        print(dict2)

    //变值

    dict2[] = ""

      dict2.updateValue("", forKey: )

        //字典的遍历

        for (iint,sttr) in dict2 {

            print("key:\(iint), value:\(sttr)")

        }

        //字典的删除

        dic1.removeValue(forKey: "key")

        dict2.removeValue(forKey: )

        dict2.removeAll()

    }

//枚举

   enum dingyi {

        case jiage(Int,String)

        case miaoshu(String)

    }

    //使用

     var jia = dingyi.jiage(, "名字")

    enum CompassPoint {

        case North

        case South

        case East

        case West

    }

    //或者用，隔开

    enum com{

        case n,s,e,w

    }

//函数。

//返回一个值 多个

func funcc( intt:Int,str:String) -> (Int,String) {

        return (intt,str)

    }

    func fffff(external exter:Int) -> Int {

        return exter;

    }

//类的使用

class ViewController: UIViewController {

    override func viewDidLoad() {

        super.viewDidLoad()

        let st = stringstring()

        st.s1 = ""

        st.s2 = ""

       let ss = st.shuchu(inn: )

        let la = wedView()

        let laa = la.labelframe(x: , y: , width: , height: )

        self.view.addSubview(laa)

    }

    class stringstring {

        var s1 : String = ""

        var s2 : String = ""

        func shuchu(inn:Int) -> Int {

            return inn * inn

        }

    }

    class wedView: UIView {

        var label = UILabel()

        func labelframe(x:Float,y:Float,width:Float,height:Float) -> UIView {

            self.backgroundColor = UIColor.gray

            self.frame = CGRect(x: , y: , width: , height: )

            label.frame = CGRect(x: , y: , width: , height: )

            label.text = "wo\nshi\nyi个\nlabel"

            label.numberOfLines =

            label.textColor = UIColor.black

            self.addSubview(label)

            return self

        }

    }