Swift中类与结构的初始化示例解析

struct FirstStruct{
     let b:Int
     let c:Int
     init() {
        b = 2
        c = 3
     }
 }
 let fs = FirstStruct()

 struct SecondStruct{
     let b:Int
     let c:Int
 }
 let ss = SecondStruct(b:2,c:3)

//struct ThirdStruct{
//    let b:Int
//    let c:Int
//    init() {
//        b = 0
//    }
//}
//let ts = ThirdStruct(c:3)

struct FourthStruct{
     let b:Int
     let c:Int
     init() {
         self.init(b:2)
     }
     init(b:Int){
         c = 2
         self.b = b
     }
 }
 let fos = FourthStruct()

 //错误示例
 //class SecondClass{
 //    let b:Int
 //    let c:Int
 //}
 //let sc = SecondClass(b:2,c:3)

class Parent2{
     var name:String
     var height:Int
     init(name:String,height:Int){
         self.name = name
         self.height = height
     }
 }
 let p2 = Parent2(name:"zs",height:168)
 p2.height
 p2.name

class Parent3{
     var name:String
     var sex:String
     init(name:String,sex:String){
         self.name = name
         self.sex = sex
     }
     init(name:String){
         self.name = name
         sex = "男"
     }
 }
 let p3 = Parent3(name:"zs",sex:"女")
 let p4 = Parent3(name:"ls")
 p3.sex
 p4.sex

class Parent3{
    var name:String
    var sex:String
    init(name:String,sex:String){
        self.name = name
        self.sex = sex
    }
    convenience init(name:String){
        self.init(name:name,sex:"男")
    }
    convenience init(){
        self.init(name:"zs")
    }
}
let p3 = Parent3(name:"zs")
let p4 = Parent3()
p3.sex
p4.sex

class Parent4{
     var name:String
     var sex:String
     init(name:String,sex:String){
         self.name = name
         self.sex = sex
     }
     convenience init(name:String){
         self.init(name:name,sex:"男")
     }
 }
 //-----------------------------------------------
 class Child4:Parent4{
     var age:Int
     init(age:Int) {
         self.age = age
         //super.init(name: "ls")错误示例
         super.init(name: "zs",sex:"妖")
     }
    convenience init(){
     self.init(age:12)
     }
 }
 let c4 = Child4()
 c4.name