面向对象与面向过程的区别

面向对象与面向过程的区别

面向过程:
它是一种自顶向下的编程,把问题分成几步,解决问题时,一步一步的调用,过程式程序建立在函数之上,数据为函数服务。
#import <Foundation/Foundation.h>


typedef enum {
    kCircle,
    kRectangle,
    kEgg
} ShapeType;

typedef enum {
    kRedColor,
    kGreenColor,
    kBlueColor
} ShapeColor;

typedef struct {
    int x;
    int y;
    int width;
    int height;
} ShapeRect;

typedef struct {
    ShapeType  type;
    ShapeColor color;
    ShapeRect bounds;
} Shape;

void drawShapes(Shape *sha, int number);

int main(int argc, const char * argv[])
{
    // 定义一个形状的数组,有3个成员
    Shape shapes[3] = {0};
    
    // 给第0个成员赋值
    ShapeRect rectCircle = {0, 0, 20, 20};
    shapes[0].bounds = rectCircle;
    shapes[0].type = kCircle;
    shapes[0].color = kRedColor;
    
    // 给第1个成员赋值
    ShapeRect rectRect = {40, 40, 100, 50};
    shapes[1].bounds = rectRect;
    shapes[1].type = kRectangle;
    shapes[1].color = kGreenColor;
    
    // 给第2个成员赋值
    ShapeRect rectEgg = {100, 90, 80, 100};
    shapes[2].bounds = rectEgg;
    shapes[2].type = kEgg;
    shapes[2].color = kBlueColor;
    
    drawShapes(shapes, 3);
    
    
    return 0;
}

NSString * colorName(ShapeColor color)
{
    NSString *name =nil;
    switch (color) {
        case kRedColor:
            name = @"Red";
            break;
        case kGreenColor:
            name = @"Green";
            break;
        case kBlueColor:
            name = @"Blue";
            break;
        default:
            break;
    }
    return name;
}

void drawCircle(ShapeRect rect, ShapeColor color)
{
    NSLog(@"Draw Circle at [%d,%d,%d,%d], fill color is %@", rect.x, rect.y, rect.width, rect.height, colorName(color));
}
void drawRectangle(ShapeRect rect, ShapeColor color)
{
    NSLog(@"Draw rectangle at [%d,%d,%d,%d], fill color is %@", rect.x, rect.y, rect.width, rect.height, colorName(color));
}
void drawEgg(ShapeRect rect, ShapeColor color)
{
    NSLog(@"Draw egg at [%d,%d,%d,%d], fill color is %@", rect.x, rect.y, rect.width, rect.height, colorName(color));
}


void drawShapes(Shape *sha, int number)
{
    int i = 0;
    for (i = 0; i < number; i++) {
        // 绘制每一个形状
        switch (sha[i].type) {
            case kCircle:
                drawCircle(sha[i].bounds, sha[i].color);
                break;
            case kRectangle:
                drawRectangle(sha[i].bounds, sha[i].color);
                break;
            case kEgg:
                drawEgg(sha[i].bounds, sha[i].color);
                break;
            default:
                break;
        }
    }
}


面向对象:
面向对象是把问题分解成个个对象,在各个对象中有自己的行为,面向对象的思想是依程序的数据为中心,函数为数据服务
先建立一个头文件#impore <common.h>
#ifndef DrawShapOOP_ShapeData_h
#define DrawShapOOP_ShapeData_h

// 形状类型
typedef enum {
    kCircle,
    kRectangle,
    kEgg
} ShapeType;

// 填充颜色
typedef enum {
    kRedColr,
    kGreenColor,
    kBlueColor
} ShapeColor;

// 形状的区域(边界)
typedef struct {
    int x;
    int y;
    int width;
    int height;
} ShapeRect;
#endif
建三个类,类名分别为:Circle.h, Rectangle.h,Egg.h
这三个类的.h里声明里的成员变量和声明方法都一样:
@interface Rectangle : NSObject
{
    ShapeColor fillColor;
    ShapeRect  bounds;
    
    
}

-(void)setFillColor:(ShapeColor)color;
-(void)setBounds:(ShapeRect)bound;
-(void)draw;

@end

它们的.m里放的是实现方法(三个.m都一样的)
@implementation Egg
-(void)setFillColor:(ShapeColor)color
{
    fillColor = color;
}

-(void)setBounds:(ShapeRect)bound
{
    
    bounds = bound;
    
}
-(NSString *)colorName
{
    NSString *name = nil;
    switch (fillColor) {
        case KRed:
            name = @"Red";
            break;
        case KGreen:
            name = @"Green";
            break;
        case KBlue:
            name = @"Blue";
            break;
        default:
            name = @"noColor";
            break;
    }
    return name;
}
-(void)draw
{
    NSLog(@"draw Egg at %d,%d,%d,%d,%@",bounds.x,bounds.y,bounds.width,bounds.height,[self colorName]);
    
}

@end
main.m里的代码为:
#import <Foundation/Foundation.h>

#import "Circle.h"
#import "Rectangle.h"
#import "Egg.h"
#import "QYShape.h"


void drawShpaes(id shap[3],int count);


int main(int argc, const char * argv[])
{

//    创建一个数组,用于存放具体的图形对象
    //QYShape *shapes[3];
    id shapes[3];
//    创建Circle对象
    Circle *circle = [Circle new];
    [circle setFillColor:kRed];
    ShapeRect bound = {0,0,20,40};
    [circle setBounds:bound];
    
//    将circle对象放到数组的第一个元素位置
    shapes[0] = circle;
    
//    创建Rectangle对象
    Rectangle *rectangle = [Rectangle new];
    [rectangle setFillColor:kGreen];
    ShapeRect rectBound = {0,100,30,50};
    [rectangle setBounds:rectBound];
    
//    将rectangle对象放到数组的第二个元素位置
    shapes[1] = rectangle;
    
//    创建Egg对象
    Egg *eg = [Egg new];
    [eg setFillColor:kBlue];
    ShapeRect eggBound = {100,200,60,80};
    [eg setBounds:eggBound];
//    将eg对象放到数组第三个元素的位置
    shapes[2] = eg;
    
//    调用绘制图形的方法
    drawShpaes(shapes, 3);

    return 0;
}

//画图的总控方法
void drawShpaes(QYShape* shap[3],int count)
{
    for (int i = 0; i < count; i++) {
        [shap[i] draw];
    }
}









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