Swift Object-oriented in iOS development

　iOS in Modern computer languages, object-oriented is a very important feature, and the Swift language also provides object-oriented support. Moreover, in swift language, not only the class has object-oriented characteristics, but also the structure and enumeration have object-oriented characteristics .

　　1. Classes and structs in Swift

The syntax for classes and struct-body definitions in Swift is very similar. We can define classes using the Class keyword, and below we define a person class that contains the age and name attributes, respectively.

Import UIKit class Jrperson:nsobject {}

We found that the definition of the class now differs greatly from the previous OC definition, and for the previous. m files and. h files have disappeared, and now we define a class with only one file. Swift file.

2 Adding properties

Here we define the properties without setting the set and Get methods as follows:

// mode one to default value    var name:string="";    var age:int! =0;     // mode two with optional type    var name:string! ; var age:int!;

3 Construction methods

　　Swift uses a construction method similar to Java, we can initialize by overloading the constructor method, the system has a default constructor method is no parameters, we can according to their own needs to overload the construction method.

 //System Self-band construction method     Overrideinit () {super.init ();}//overloaded construction methods, with two attributes as parametersInit (name:string,age:int) {super.init (); Self.name=name; Self.age=Age ; }//overloaded construction method, using a dictionary as a parameterInit (dic:D ictionary<string,string>) {super.init (); Self.name=dic["name"]; Self.age=dic[" Age"]?. ToInt (); }

4 object initialization is as follows

//initialize with the default constructor methodvar per0=Jrperson (); //initialize with two-parameter construction methodvar Per1=jrperson (name:"Zhangsan", Age: One); //initialize with a constructor method with dictionary parametersvar dic=["name":"Zhangsan"," Age":" -"]; var per3=Jrperson (dic:dic);5methods of the object/** * Print out the current person's attributes no parameters, no return value*/func Show () {println ("name=\ (name) and age=\ (age)"); }/** * Print out the current person's attributes have parameters, there is a return value = = Arrow represents the type of return value, our return value at this time is shaping*/func show2 (num:int,str:string,param:string)-int{ for(Var i=0; i<num;i++) {println (str); }                return Ten; }

Class 6 methods

class method only needs to be added in the previous　　 class can be as follows

/* * *   class Method    *    *  @return < #return value description#>       */ class func show3 () {              println ("hello");    }

7 Invocation of the method

// Initialize with the default constructor method        var per0=Jrperson ();                 // Calling Object Methods         per0.show ();         // Calling class methods        JRPERSON.SHOW3 ();

Jerry Education
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Swift Object-oriented in iOS development