熟悉oc面向对象的小例子

OC面向对象小例子：

////  main.m//  oc-面向对象小例子////  Created by stevenchang on 9/16/15.//  Copyright (c) 2015 cz. All rights reserved.//#import <Foundation/Foundation.h>#import "Point2D.h"#import "Circle.h"int main(int argc, const char * argv[]) {    @autoreleasepool {        // insert code here...//        NSLog(@"Hello, World!");        Point2D *point1 = [[Point2D alloc] init];        [point1 setX:3];        [point1 setY:4];                Point2D *point2 = [[Point2D alloc] init];        [point2 setX:0];        [point2 setY:0];                double distince = [point1 distinceWithOtherPoint:point2];                NSLog(@"两点之间的距离为:%f",distince);                Point2D *point3 = [[Point2D alloc] init];        [point3 setX:3 andY:4];        Point2D *point4 = [[Point2D alloc] init];        [point4 setX:-1 andY:-1];                double distince1 = [Point2D distinceBetweenPoint:point3 andOtherPoint:point4];        NSLog(@"两点之间的距离为:%f", distince1);                NSLog(@"========================================");        Circle *circle = [[Circle alloc] init];        [circle setRadius:5];        Point2D *point5 = [[Point2D alloc] init];        [point5 setX:10 andY:19];        [circle setPoint:point5];                Circle *circle1 = [[Circle alloc] init];        [circle1 setRadius:4];        Point2D *point6 = [[Point2D alloc] init];        [point6 setX:13 andY:14];        [circle1 setPoint:point6];//        Boolean flag = [circle isInteractWithOtherCircle:circle1];        Boolean flag = [Circle isInteractBewteenCircle:circle andOtherCircle:circle1];        if (flag) {            NSLog(@"相交");        } else {            NSLog(@"不相交");        }            }    return 0;}

////  Point2D.h//  oc-面向对象小例子////  Created by stevenchang on 9/16/15.//  Copyright (c) 2015 cz. All rights reserved.////import应用Foundation#import <Foundation/Foundation.h>//声明一个Point2D类   : 表示继承@interface Point2D : NSObject{    double _x;    // x坐标    double _y;    // y坐标}//x getter & setter method- (void)setX:(double)x;- (double)x;//y getter & setter method- (void)setY:(double)y;- (double)y;//同时设置x&y- (void)setX:(double)x andY:(double)y;    //计算到其他点之间的距离- (double)distinceWithOtherPoint:(Point2D *)other;//计算两个点之间的距离+ (double)distinceBetweenPoint:(Point2D *)point1 andOtherPoint:(Point2D *)point2;@end

////  Point2D.m//  oc-面向对象小例子////  Created by stevenchang on 9/16/15.//  Copyright (c) 2015 cz. All rights reserved.//#import "Point2D.h"#import <math.h>@implementation Point2D//x getter & setter mehtod- (void)setX:(double)x {    _x = x;}- (double)x {    return _x;}//y getter & setter method- (void)setY:(double)y {    _y = y;}- (double)y {    return _y;}//同时设置x&y- (void)setX:(double)x andY:(double)y {    [self setX:x];    [self setY:y];}//计算到其他点之间的距离- (double)distinceWithOtherPoint:(Point2D *)other {    double xData = self->_x - other->_x;    double yData = self->_y - other->_y;        return sqrt(pow(xData, 2) + pow(yData, 2));}//计算两个点之间的距离+ (double)distinceBetweenPoint:(Point2D *)point1 andOtherPoint:(Point2D *)point2 {    return [point1 distinceWithOtherPoint:point2];}@end

////  Circle.h//  oc-面向对象小例子////  Created by stevenchang on 9/16/15.//  Copyright (c) 2015 cz. All rights reserved.////import引用Foundation#import <Foundation/Foundation.h>#import "Point2D.h"//声明一个Circle类  : 表示圆心@interface Circle : NSObject{    double _radius;    // 半径    Point2D *_point;   // 圆心}// radius getter & setter- (void)setRadius:(double)radius;- (double)radius;//point getter & setter- (void)setPoint:(Point2D *)point;- (Point2D *)point;//判断同另一个圆是否相交- (BOOL)isInteractWithOtherCircle:(Circle *)other;//判断两个圆是否相交+ (BOOL)isInteractBewteenCircle:(Circle *)circle1 andOtherCircle:(Circle *)other;@end

////  Circle.m//  oc-面向对象小例子////  Created by stevenchang on 9/16/15.//  Copyright (c) 2015 cz. All rights reserved.//#import "Circle.h"@implementation Circle//radius getter & setter- (void)setRadius:(double)radius {    _radius = radius;}- (double)radius {    return _radius;}//point getter & setter- (void)setPoint:(Point2D *)point {    _point = point;}- (Point2D *)point {    return _point;}//判断同另一个圆是否相交- (BOOL)isInteractWithOtherCircle:(Circle *)other {    //半径之和    double totalRadius = [self radius] + [other radius];        //圆心距离    double distince = [[self point] distinceWithOtherPoint:[other point]];    return distince < totalRadius;  //YES:相交   NO:不想交}//判断两个圆是否相交+ (BOOL)isInteractBewteenCircle:(Circle *)circle1 andOtherCircle:(Circle *)other {    return [circle1 isInteractWithOtherCircle:other];}@end