从入门到精通swift编程未小码哥课件源码瑞客1期

@M了个 实力ITn值类型（枚举、结构体）nn子类可以重写父类的下标、方法、属性，重写必须加上overrideletleta=Animal()a.age=10//32print(Mems.size(ofRef:a))print(Mems.memStr(ofRef:a))classAnimal{varclassAnimal{varage=0}classDog:Animalvarweight=}classErHa:Dog{variq=0}{lete=ErHa()e.age=10e.weight=e.iq=//48print(Mems.size(ofRef:e))print(Mems.memStr(ofRef:letd=Dog()d.age=10d.weight=//32print(Mems.size(ofRef:d))print(Mems.memStr(ofRef:d))classAnimal{funcclassAnimal{funcspeak(){print("Animal}subscript(index:Int)->Int{returnindex}}classCat:Animal{overridefuncspeak(){print("Catspeak")}overridesubscript(index:Int)->Int{returnsuper[index]+1}}varanim:Animalanim=Animal()//Animalspeak//6anim=//Animal//Catspeak//7n被class修饰的类型方法、下标，允许n被static修饰的类型方法、下标，不允许classclassAnimalclassfuncspeak(){print("Animalspeak")}classsubscript(index:Int)->Int{returnindex}}//Animalspeak//6classCat:Animaloverrideclassfuncspeak(){print("Cat}overrideclasssubscript(index:Int)->Int{returnsuper[index]+1}}//Animal//Catspeak//7n子类可以将父类的属性（、计算）重写为n子类不可以将父类属性重写为属性n只能重写var属性，不能重写let属性n重写时，属性名、类型要一致nppclassclassCirclevarradius:Int=0vardiameter:Intsetprint("CirclesetDiameter")radius=newValue/2}getprint("CirclegetDiameter")returnradius*2}}}varcircle:Circlecircle=Circle()circle.radius=6//Circle//12//CirclesetDiametercircle.diameter=20//10classSubCircleclassSubCircle:Circle{overridevarradius:Int{setprint("SubCirclesuper.radius=newValue>0?newValue:}getprint("SubCirclegetRadius")returnsuper.radius}}overridevardiameter:Int{set{print("SubCirclesetDiameter")super.diameter=newValue>0?newValue:0}getprint("SubCirclegetDiameter")returnsuper.diameter}}}circle=//SubCirclesetRadiuscircle.radius=6//SubCircle//Circle//SubCircle//12//SubCircle//Circle//SubCirclesetRadiuscircle.diameter=20//SubCircle//10n被class修饰的计算类型属性，可以n被static修饰的类型属性 、计算），不可以被子类重Circle.radius=Circle.radius=//Circle//12//CirclesetDiameterCircle.diameter=20//10classSubCircle:Circleoverridestaticvardiameter:Int{set{print("SubCirclesetDiameter")super.diameter=newValue>0?newValue:0}getprint("SubCirclegetDiameter")returnsuper.diameter}}}staticvarradius:Int=0classvardiameter:Int{setprint("CirclesetDiameter")radius=newValue/2}getSubCircle.radius=//SubCircleSubCircle.radius=//SubCircle//Circle//12//SubCircle//CirclesetDiameterSubCircle.diameter=20//10}}}n可以在子类中为父类属性（除了只读计算属性、let属性）classclassCirclevarradius:Int=}classSubCircle:Circle{overridevarradius:Int{willSetprint("SubCirclewillSetRadius",}didSetprint("SubCircledidSetRadius",oldValue,}}}varcircle=//SubCirclewillSetRadius//SubCircledidSetRadius1circle.radius=varcircle=varcircle=//SubCirclewillSetRadius//CirclewillSetRadius//CircledidSetRadius1//SubCircledidSetRadius1circle.radius=varradius:Int=1{willSet{print("CirclewillSetRadius",}didSetprint("CircledidSetRadius",oldValue,}}}classSubCircle:Circle{overridevarradius:Int{willSetprint("SubCirclewillSetRadius",}didSetprint("SubCircledidSetRadius",oldValue,}}}varcircle=varcircle=//Circle//SubCirclewillSetRadius//CirclesetRadius//Circle//SubCircledidSetRadius20circle.radius=varradius:Int{set{print("CirclesetRadius",}getprint("CirclegetRadius")return20}}}classSubCircle:Circle{overridevarradius:Int{willSetprint("SubCirclewillSetRadius",}didSetprint("SubCircledidSetRadius",oldValue,}}}//Circle////Circle//SubCirclewillSetRadius//CirclesetRadius//Circle//SubCircledidSetRadius20SubCircle.radius=classvarradius:Int{set{print("CirclesetRadius",}getprint("CirclegetRadius")retur