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函数与对象

实例:写一个车的类

 

//类的声明部分

@interface Car : NSObject

{

  int _speed;   //速度

  int _wheel;   //轮子

}

-(void)run;

@end

 

//类的实现部分

@implementation Car

-(void)run{

  NSLog(@"车的速度是:%i,轮子是%i",_speed,_wheel);

}

@end

//函数的存在不依赖于类

void test1(Car *_car){

  _car->_speed = 120;

  _car->_wheel = 2;

}

 

//OC的类都是数据类型,可以做参数

void test2(Car *_car){

  Car *car2 = [Car new];

  car2->_wheel = 4;

  car2->_speed = 200;

 

  _car = car2

 

  _car->_speed = 220;

  _car->_wheel = 6;

}

 

#import <Foundation/Foundation.h>

int main(){

  Car *car1 = [Car new];

  car1->_speed = 100;

  car1->_wheel =4;

  

  test2(car1);

  [car1 run];  //实现的结果还是100  4

  return 0;

}

 

函数与对象