iOS设计模式 - 生成器

 

原理图

 

说明

1. 将构建复杂对象的过程拆分成一个一个的模块,通过统一的指导者来指导对象的构建过程称之为生成器模式

2. 生成器模式适合用于构建组合的对象

 

源码

////  CarBuilder.h//  BuilderPattern////  Created by YouXianMing on 15/9/14.//  Copyright (c) 2015年 YouXianMing. All rights reserved.//#import 
     
      @interface CarBuilder : NSObject {        NSMutableDictionary *_carInfo;}/** *  汽车信息 */@property (nonatomic, strong, readonly) NSDictionary *car;/** *  建造轮子 */- (void)buildWheel;/** *  建造引擎 */- (void)buildEngine;/** *  构造外壳 */- (void)buildShell;@end
     

////  CarBuilder.m//  BuilderPattern////  Created by YouXianMing on 15/9/14.//  Copyright (c) 2015年 YouXianMing. All rights reserved.//#import "CarBuilder.h"@interface CarBuilder ()@end@implementation CarBuilder- (instancetype)init {        self = [super init];    if (self) {                _carInfo = [[NSMutableDictionary alloc] init];    }    return self;}- (void)buildWheel {    _carInfo[@"wheel"] = @"normal_wheel";}- (void)buildEngine {    _carInfo[@"engine"] = @"normal_engine";}- (void)buildShell {    _carInfo[@"shell"] = @"normal_shell";}@synthesize car = _car;- (NSDictionary *)car {    return [[NSDictionary alloc] initWithDictionary:_carInfo];}@end

////  BMWBuilder.h//  BuilderPattern////  Created by YouXianMing on 15/9/14.//  Copyright (c) 2015年 YouXianMing. All rights reserved.//#import "CarBuilder.h"@interface BMWBuilder : CarBuilder@end

////  BMWBuilder.m//  BuilderPattern////  Created by YouXianMing on 15/9/14.//  Copyright (c) 2015年 YouXianMing. All rights reserved.//#import "BMWBuilder.h"@implementation BMWBuilder- (void)buildWheel {        _carInfo[@"wheel"] = @"BMO_wheel";}- (void)buildEngine {        _carInfo[@"engine"] = @"BMO_engine";}- (void)buildShell {        _carInfo[@"shell"] = @"BMO_shell";}@end

////  ViewController.m//  BuilderPattern////  Created by YouXianMing on 15/9/14.//  Copyright (c) 2015年 YouXianMing. All rights reserved.//#import "ViewController.h"#import "CarBuilder.h"#import "BMWBuilder.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {        [super viewDidLoad];        CarBuilder *builder = [[CarBuilder alloc] init];    [builder buildEngine];    [builder buildShell];    [builder buildWheel];    NSLog(@"%@", builder.car);        CarBuilder *bmwBuilder = [[BMWBuilder alloc] init];    [bmwBuilder buildEngine];    [bmwBuilder buildShell];    [bmwBuilder buildWheel];    NSLog(@"%@", bmwBuilder.car);}@end

 

分析

关系伦理图