The second OC class and the second oc class

The second OC class and the second oc class

Example:

Creates a class, creates an object, calls a method, and changes the attribute value.

 

// Declare the class

@ Interface Person: NSObject

{

@ Public // make it possible to call member variables outside the class

Int _ weight; // weight

}

-(Void) run;

-(Void) rat :( char *) food;

@ End

 

// Class implementation

@ Implementation Person

-(Void) run {

_ Weight-= 2;

NSLog (@ "the weight after the step is % I", _ weight );

}

-(Void) eat :( char *) food {

_ Weight + = 10;

NSLog (@ "the weight after % s is % I", food, _ weight );

}

@ End

 

# Import <Foundation/Foundation. h>

Int main (){

Person * person1 = [Person new]

Person1-> _ weight = 100;

NSLog (@ "weight before meals: % I", _ weight );

[Person1 run];

 

NSLog (@ "weight before meals: % I", person1-> _ weight );

[Person1 eat: "steamed bread"];

Return 0;

}

How does oc determine whether an object is an instance of a subclass of a class?

If ([childObject. Parent class] isKindOfClass: [Parent class]
{
}
 
In OC, how does one perform subclass calling of superclass in the maimm file?

There is no way to do this in OC. If you want B to call the method of parent class. As you said, it can only be called in the print method of B.
[Super print] That is to say, B should complete its proper encapsulation. Other classes (such as main) should not care about what the print method of B has done.