Swift properties of classes and objects in object-oriented

The properties of classes and objects in Swift are divided into three types: storage properties, computed properties, and class properties.

ImportFoundationclass Person {//Storage attribute must be assigned an initial value  varScore1:int = -  varScore2:int = -  //Delay storage properties, assign when neededLazyvarDog:dog = Dog ()//Calculate attribute, cannot assign initial value, provide get and set method,  varSum:int {get {returnScore1 + Score2}}//Class attribute, can only be computed attribute, use class instead of object to call  //As Person.descClassvardesc:string {get {return "This is a person ."}  }//Construction methodInit () {println("This is a person .")}}class Dog {init () {println("This is one dog.")  }}varp = person ()println(PERSON.DESC)println(P.score1)println(P.score2)println(p.sum)println(P.dog)

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Swift properties of classes and objects in object-oriented