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 = ["1","11","22","dd"]
        //简单写法
        var arr1 = ["11","ee"]
        //数组拼接 数组
        var arr3 = arr + arr1
        //数组拼接 字符串
        arr3.append("555")
        
        arr3 += ["444","44444"]
        
        print(arr3)
        //插入数据
        arr3.insert("098", at: 3)
        
        //获取数组中的数据
        let str1 = arr3[1]
        print(str1)
        
        //改变 数据
        arr3[3] = "rrr"
        
        //改变多个
        arr3[2...5] = ["222","77","333"]
        
        //删除数据
        let strremo = arr3.remove(at: 2) // 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 = [11 : "eer" , 9 : "err"]
        
        //创建一个空字典
        var kong = Dictionary<Int,String>()
        
        kong[0] = "111"
        
       print(kong)
        
        
        print(dict2)
    //变值
    dict2[11] = "4567"
      dict2.updateValue("33", forKey: 9)
        
        
        //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: 0)
        dict2.removeAll()
        
    }
  

//枚举
   enum dingyi {
        case jiage(Int,String)
        case miaoshu(String)
    }
    
    //使用
     var jia = dingyi.jiage(10, "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 = "32443"
        st.s2 = "478"
        
       let ss = st.shuchu(inn: 4)
      
       
        let la = wedView()
        
        let laa = la.labelframe(x: 0, y: 0, width: 0, height: 0)
       
        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: 20, y: 300, width: 100, height: 100)
            label.frame = CGRect(x: 10, y: 10, width: 100, height: 100)
            
            label.text = "wo\nshi\nyi个\nlabel"
            label.numberOfLines = 0
            label.textColor = UIColor.black
            self.addSubview(label)
            
            return self
            
            
        }
   
    }