OC继承
main函数
//
// main.m
// OC8继承
//
// Created by Zoujie on 15/8/23.
// Copyright (c) 2015年 Zoujie. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "ClassA.h"
#import "ClassB.h"
#import "Classc.h"
#import "Rectangle.h"
#import "Square.h"
#import "XYPoint.h"
//不能通过继承删除或减少方法，只能添加
int main(int argc, const char * argv[]) {
@autoreleasepool {
ClassA *a = [ClassA new];
[a initVar];
[a print];
ClassB *b = [ClassB new];
[b initVar];//继承的方法
[b print];
ClassC *c = [ClassC new];
[c initVar];
[c print];
Rectangle *myRectangle = [Rectangle new];
[myRectangle setWidth:5.71 height:8.52];
NSLog(@"Rectangle:w = %f,h = %f",myRectangle.width,myRectangle.height);
NSLog(@"Area = %i , Perimiter = %i",[myRectangle area],[myRectangle perimeter]);
Square *mySquare = [Square new];
[mySquare setSide:5];
NSLog(@"Square s = %i",[mySquare side]);
NSLog(@"Area = %i , Perimiter = %i",[mySquare area],[mySquare perimeter]);
Rectangle *myRect = [Rectangle new];
XYPoint *myPoint = [XYPoint new];
[myPoint setX:50 andY:50];
[myRect setWidth:10 height:20];
myRect.origin = myPoint;//XYPoint 对象赋值给了Rectangle的变量 myPoint 改变 myRect的变量也会改变
NSLog(@"Rectangle w = %i,h = %i",myRect.width,myRect.height);
NSLog(@"Origin at (%i,%i)",myRect.origin.x,myRect.origin.y);
[myPoint setX:100 andY:200];
[myRect setOrigin:myPoint];//修改Set方法 让每个新创建的origin对象都有她自己的实例
NSLog(@"Rectangle w = %i,h = %i",myRect.width,myRect.height);
NSLog(@"Origin at (%i,%i)",myRect.origin.x,myRect.origin.y);
NSLog(@"Area = %i,Perimeter = %i",myRect.area,myRect.perimeter);
}
return 0;
}
// // Square.h // OC8继承 // // Created by Zoujie on 15/8/23. // Copyright (c) 2015年 Zoujie. All rights reserved. // #import "Rectangle.h" @interface Square : Rectangle -(void) setSide :(int) s; -(int) side; @end
//
// Square.m
// OC8继承
//
// Created by Zoujie on 15/8/23.
// Copyright (c) 2015年 Zoujie. All rights reserved.
//
#import "Square.h"
@implementation Square
-(void) setSide:(int)s
{
[self setWidth:s height:s];
}
//对父类的变量直接取值
-(int) side
{
return self.width;
}
@end
// // Rectangle.h // OC8继承 // // Created by Zoujie on 15/8/23. // Copyright (c) 2015年 Zoujie. All rights reserved. // #import <Foundation/Foundation.h> @class XYPoint;//使用@class指令提高了效率，因为编译器不需要引入和处理整个XYPoint.h文件是一个类名。如果需要引用XYPloint类的方法（在实现部分中），@class指令是不够的，因为编译器需要更多地消息。 @interface Rectangle : NSObject @property float width,height; -(XYPoint *)origin; -(void) setOrigin:(XYPoint *) pt; -(int) area;//面积 -(int) perimeter;//周长 -(void) setWidth:(float)w height:(float) h; @end
//
// Rectangle.m
// OC8继承
//
// Created by Zoujie on 15/8/23.
// Copyright (c) 2015年 Zoujie. All rights reserved.
//
#import "Rectangle.h"
#import "XYPoint.h"
@implementation Rectangle
{
XYPoint *origin;// 在实现部分声明和合成(syntherize)的实例变量是私有的，子类中并不能直接访问，需要明确定义或合成取值方法，才能访问实例变量的值。
}
@synthesize width,height;
-(void) setWidth:(float)w height:(float) h
{
width = w;
height = h;
}
-(int)area
{
return width * height;
}
-(int)perimeter
{
return (width+height)*2;
}
//
-(void) setOrigin:(XYPoint *)pt
{
if (!origin)
{
origin = [XYPoint new];
}
origin.x = pt.x;
origin.y = pt.y;
// origin = pt;
}
-(XYPoint *)origin
{
return origin;
}
@end
#import <Foundation/Foundation.h> @interface XYPoint : NSObject @property int x,y; -(void) setX:(float) xVal andY:(float) yVal; @end
//
// XYPoint.m
// OC8继承
//
// Created by Zoujie on 15/8/27.
// Copyright (c) 2015年 Zoujie. All rights reserved.
//
#import "XYPoint.h"
@implementation XYPoint
@synthesize x,y;
-(void) setX:(float)xVal andY:(float)yVal
{
x = xVal;
y = yVal;
}
@end