Li Hongqiang iOS Development Create an object and access the instance variable

//

Main.m

- Create an object and access the instance variable

//

Created by Vic fan on 16/7/3.

copyright©2016 year Li Hongqiang . All rights reserved.

//

//Car *car = [car new];

Class name * pointer = [ class name new];

[Car new]; have done three things :

1 requesting memory space from your computer

2 Initializing an instance variable in a class

3 Returns the memory address of the object

#import <Foundation/Foundation.h>

@interface Car: nsobject{

//@protected/// default is @protected protected , only instance variables can be accessed in the current class and subclass

@public

instance variables for the //class

int _speed; speed

nsstring *_color; // color

int _wheelcount; Wheel Count

}

declaration of a class method

@end

implementation of the class

@implementation Car

implementation of class methods

@end

int Main (int argc, const Char * argv[]) {

@autoreleasepool {

car *car = [car new];

// give the address to car

// assigning values to instance variables in a class

car->_color = @ " blue ";

car->_speed = +;

car->_wheelcount = 4;

// Accessing instance variables in a class

NSLog(@ " color :%@, speed :%d, wheel count :%d",car->_color,car->_ Speed,car->_wheelcount);

}

return 0;

}

Li Hongqiang iOS Development Create an object and access the instance variable