iOS设计模式 - 适配器

效果

说明

1. 为了让客户端尽可能的通用,我们使用适配器模式来隔离客户端与外部参数的联系,只让客户端与适配器通信.

2. 本教程实现了适配器模式的类适配器与对象适配器两种模式,各有优缺点.

3. 如果对面向对象基本原理以及设计模式基本原理不熟悉,本教程会变得难以理解.

源码

https://github.com/YouXianMing/AdapterPattern

//
//  BusinessCardView.h
//  Adapter
//
//  Created by YouXianMing on 15/7/25.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "BusinessCardAdapterProtocol.h"

#define  BUSINESS_FRAME  CGRectMake(0, 0, 200, 130)

@interface BusinessCardView : UIView

/**
 *  名字
 */
@property (nonatomic, strong) NSString *name;

/**
 *  线条颜色
 */
@property (nonatomic, strong) UIColor  *lineColor;

/**
 *  电话号码
 */
@property (nonatomic, strong) NSString *phoneNumber;

/**
 *  加载数据(实现了BusinessCardAdapterProtocol协议的数据)
 *
 *  @param data 实现了BusinessCardAdapterProtocol协议的数据
 */
- (void)loadData:(id <BusinessCardAdapterProtocol>)data;

@end

//
//  BusinessCardView.m
//  Adapter
//
//  Created by YouXianMing on 15/7/25.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//

#import "BusinessCardView.h"

@interface BusinessCardView ()

@property (nonatomic, strong) UILabel  *nameLabel;
@property (nonatomic, strong) UIView   *lineView;
@property (nonatomic, strong) UILabel  *phoneNumberLabel;

@end

@implementation BusinessCardView

#pragma mark - 初始化
- (instancetype)initWithFrame:(CGRect)frame {

    self = [super initWithFrame:frame];
    if (self) {

        [self setup];
    }

    return self;
}

- (void)setup {

    self.backgroundColor     = [UIColor whiteColor];
    self.layer.borderWidth   = 0.5f;
    self.layer.shadowOpacity = 0.5f;
    self.layer.shadowOffset  = CGSizeMake(5, 5);
    self.layer.shadowRadius  = 1.f;
    self.layer.shadowColor   = [UIColor grayColor].CGColor;

    self.nameLabel      = [[UILabel alloc] initWithFrame:CGRectMake(15, 10, 150, 25)];
    self.nameLabel.font = [UIFont fontWithName:@"Avenir-Light" size:20.f];
    [self addSubview:self.nameLabel];

    self.lineView                 = [[UIView alloc] initWithFrame:CGRectMake(0, 45, 200, 5)];
    [self addSubview:self.lineView];

    self.phoneNumberLabel               = [[UILabel alloc] initWithFrame:CGRectMake(41, 105, 150, 20)];
    self.phoneNumberLabel.textAlignment = NSTextAlignmentRight;
    self.phoneNumberLabel.font          = [UIFont fontWithName:@"AvenirNext-UltraLightItalic" size:16.f];
    [self addSubview:self.phoneNumberLabel];
}

- (void)loadData:(id <BusinessCardAdapterProtocol>)data {

    self.name        = [data name];
    self.lineColor   = [data lineColor];
    self.phoneNumber = [data phoneNumber];
}

#pragma mark - 重写setter,getter方法
@synthesize name        = _name;
@synthesize lineColor   = _lineColor;
@synthesize phoneNumber = _phoneNumber;

- (void)setName:(NSString *)name {

    _name           = name;
    _nameLabel.text = name;
}

- (NSString *)name {

    return _name;
}

- (void)setLineColor:(UIColor *)lineColor {

    _lineColor                = lineColor;
    _lineView.backgroundColor = _lineColor;
}

- (UIColor *)lineColor {

    return _lineColor;
}

- (void)setPhoneNumber:(NSString *)phoneNumber {

    _phoneNumber           = phoneNumber;
    _phoneNumberLabel.text = phoneNumber;
}

- (NSString *)phoneNumber {

    return _phoneNumber;
}

@end

//
//  BusinessCardAdapter.h
//  NormalProblem
//
//  Created by YouXianMing on 15/7/25.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
#import "BusinessCardAdapterProtocol.h"

@interface BusinessCardAdapter : NSObject <BusinessCardAdapterProtocol>

/**
 *  输入对象
 */
@property (nonatomic, weak) id data;

/**
 *  与输入对象建立联系
 *
 *  @param data 输入的对象
 *
 *  @return 实例对象
 */
- (instancetype)initWithData:(id)data;

@end

//
//  BusinessCardAdapter.m
//  NormalProblem
//
//  Created by YouXianMing on 15/7/25.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//

#import "BusinessCardAdapter.h"

@implementation BusinessCardAdapter

- (instancetype)initWithData:(id)data {

    self = [super init];
    if (self) {

        self.data = data;
    }

    return self;
}

- (NSString *)name {

    return nil;
}

- (UIColor *)lineColor {

    return nil;
}

- (NSString *)phoneNumber {

    return nil;
}

@end

//
//  BusinessCardAdapterProtocol.h
//  NormalProblem
//
//  Created by YouXianMing on 15/7/25.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//

#import <Foundation/Foundation.h>

@protocol BusinessCardAdapterProtocol <NSObject>

- (NSString *)name;

- (UIColor *)lineColor;

- (NSString *)phoneNumber;

@end

分析

这是基于BusinessCardView构建出来的必不可少的抽象适配器以及一个协议,通过继承抽象适配器来实现具体的适配器,协议是用来统一接口.

对象适配器与类适配器.

客户端(BusinessCardView)只与适配器进行通信,它不关心数据源 NormalModel 与 SpecialModel 的业务逻辑

此处的抽象是核心所在