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