IOS-工厂模式-Demo

案例描述：一个食品加工厂，不同的车间生产不同的食物。

工厂Controller：

#import <UIKit/UIKit.h>

@interface FactoryVC : UIViewController

@end

#import "FactoryVC.h"
#import "Food.h"
#import "UIUtil.h"
#import "Masonry.h"
#import "Factory.h"
@interface FactoryVC ()

@end

@implementation FactoryVC

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    UIButton *btn1 = [UIUtil btnWithTitle:@"馒头" bgColor:[UIColor lightGrayColor] titleFont:[UIFont systemFontOfSize:13] titleColor:[UIColor blackColor] selecor:@selector(touAction:) target:self];
    btn1.tag = 100;
    [self.view addSubview:btn1];
    __weak typeof(self) weakSelf = self;
    [btn1 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(weakSelf.view);
        make.top.equalTo(weakSelf.view).mas_offset(100);
        make.width.mas_equalTo(100);
        make.height.mas_equalTo(40);
    }];
    UIButton *btn2 = [UIUtil btnWithTitle:@"油条" bgColor:[UIColor lightGrayColor] titleFont:[UIFont systemFontOfSize:13] titleColor:[UIColor blackColor] selecor:@selector(touAction:) target:self];
    btn2.tag = 200;
    [self.view addSubview:btn2];
    [btn2 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(weakSelf.view);
        make.top.equalTo(btn1.mas_bottom).mas_offset(50);
        make.width.mas_equalTo(100);
        make.height.mas_equalTo(40);
    }];
    
}
- (void)touAction:(UIButton *)sender{
    BreakfastType type;
    switch (sender.tag) {
        case 100:
            type = BreakfastType_mantou;
            break;
        case 200:
            type = BreakfastType_youtiao;
            break;
        default:
            type = BreakfastType_mantou;
            break;
    }
    Food *brakfast = [Factory creatBreakfast:type];
    NSLog(@"%@",[brakfast productName]);
    
    UIAlertController *alertCon = [UIAlertController alertControllerWithTitle:@"哈哈" message:[brakfast productName] preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"ok" style:UIAlertActionStyleDefault handler:nil];
    [alertCon addAction:okAction];
    [self presentViewController:alertCon animated:YES completion:nil];
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

@end

工厂：

#import <Foundation/Foundation.h>
#import "Food.h"
typedef NS_ENUM(NSInteger,BreakfastType){
    BreakfastType_mantou,
    BreakfastType_youtiao
};
@interface Factory : NSObject
+ (Food *)creatBreakfast:(BreakfastType)type;
@end

#import "Factory.h"
#import "MantouBreakfast.h"
#import "YoutiaoBreakfast.h"

@implementation Factory
+ (Food *)creatBreakfast:(BreakfastType)type{
    Food *breakfast;
    switch (type) {
        case BreakfastType_mantou:
        {
            breakfast = [[MantouBreakfast alloc] init];
        }
            break;
        case BreakfastType_youtiao:
        {
            breakfast = [[YoutiaoBreakfast alloc] init];
        }
            break;
        default:
            return nil;
            break;
    }
    return breakfast;
}
@end

食物基类

#import <Foundation/Foundation.h>

@interface Food : NSObject
- (NSString *)productName;
@end

#import "Food.h"

@implementation Food
- (NSString *)productName{
    return @"我是早餐";
}
@end

馒头

#import <Foundation/Foundation.h>
#import "Food.h"
@interface MantouBreakfast : Food

@end

#import "MantouBreakfast.h"

@implementation MantouBreakfast
- (NSString *)productName{
    return @"我是馒头==";
}
@end

油条

#import <Foundation/Foundation.h>
#import "Food.h"

@interface YoutiaoBreakfast : Food

@end

#import "YoutiaoBreakfast.h"

@implementation YoutiaoBreakfast
- (NSString *)productName{
    return @"我是油条==";
}
@end