iOS支付功能

谁践踏了优雅 2021-10-23 08:25 430阅读 0赞

文章转载自：[https://www.jianshu.com/p/8eb14edca8fb][https_www.jianshu.com_p_8eb14edca8fb]

## 1.简介 ##

> iOS支付主要分两类：第三方支付和应用内支付（内购）；  
> 其中第三方支付包括有：支付宝支付、微信支付、银联支付、百度钱包支付、京东支付等；  
> 应用内支付（In-App- Purchase）：在应用程序内购买虚拟商品。如果你在App Store上销售的应用程序，将收到支付金额的70%，苹果公司和你三七分成；

## 2.第三方支付 ##

### 1.弹出方式 ###

网页

> 有些第三方支付没有安装客户端，可以直接弹出网页进行支付。（比如支付宝）

调用APP

> 手机中安装了客户端可以跳转到APP中进行支付。微信支付只能调用App进行支付。

### 2. 支付宝支付 ###

相关资料:

*  支付宝开放平台（SDK&开发文档）：[https://open.alipay.com/platform/home.htm][https_open.alipay.com_platform_home.htm]  
    [https://docs.open.alipay.com/200/105310][https_docs.open.alipay.com_200_105310]
 *  移动支付集成：[https://doc.open.alipay.com/doc2/detail?treeId=59&articleId=103563&docType=1][https_doc.open.alipay.com_doc2_detail_treeId_59_articleId_103563_docType_1]
 *  商户服务平台（与支付宝签约需要填写的公司资料）：[https://b.alipay.com/newIndex.htm][https_b.alipay.com_newIndex.htm]

支付流程

> 1.在商户服务平台先和支付宝签约，获得商户ID（partner）和账号ID（seller），需要提供公司资质或营业执照，个人无法申请。  
> 2.生成并下载相应的公钥私钥文件（加密签名时候要用）。  
> 3.下载支付宝SDK：[https://doc.open.alipay.com/doc2/detail?treeId=54&articleId=103419&docType=1][https_doc.open.alipay.com_doc2_detail_treeId_54_articleId_103419_docType_1]  
> 4.生成订单信息。  
> 5.调用支付宝客户端，由支付宝客户端跟支付宝安全服务器打交道。  
> 6.支付完毕后返回支付结果给商家客户端和服务器。

代码集成流程

1.下载官方SDK  
下载地址：[https://doc.open.alipay.com/doc2/detail?treeId=54&articleId=103419&docType=1][https_doc.open.alipay.com_doc2_detail_treeId_54_articleId_103419_docType_1]  
目录结构如下：

├── AlipaySDK.bundle
    ├── AlipaySDK.framework
    ├── Order.h
    ├── Order.m
    ├── Util
    ├── libcrypto.a
    ├── libssl.a
    └── openssl

其中：

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTUyMDBjN2IxZmE0MWZiMDUucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy81NjEvZm9ybWF0L3dlYnA][]

屏幕快照 2017-04-13 下午7.09.54.png

2.添加依赖库

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLWJmYTA3NWFkYmI4YzIyMjQucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

LB1PlBHKpXXXXXoXXXXXXXXXXXX.png

> 其中，需要注意的是：  
> 1.如果是Xcode 7.0之后的版本，需要添加libc++.tbd、libz.tbd；  
> 2.如果是Xcode 7.0之前的版本，需要添加libc++.dylib、libz.dylib。

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTNiNmY3ZTQ2OGJiZTIzMmUucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy82NTAvZm9ybWF0L3dlYnA][]

屏幕快照 2017-04-13 下午7.11.38.png

6.生成订单信息及签名

//将商品信息赋予AlixPayOrder的成员变量
    Order *order = [[Order alloc] init];
    order.partner = PartnerID; // 商户ID
    order.seller = SellerID; // 账号ID
    order.tradeNO = @"20150923"; //订单ID（由商家自行制定）
    order.productName = @"iPhone6s"; //商品标题
    order.productDescription = @"新年打折"; //商品描述
    order.amount = @"0.01"; //商品价格(单位：元)
    order.notifyURL =  @"http://www.chaosky.me"; //回调URL，支付成功或者失败回调通知自己的服务器进行订单状态变更
    order.service = @"mobile.securitypay.pay";
    order.paymentType = @"1";
    order.inputCharset = @"utf-8";
    order.itBPay = @"30m";
    order.showUrl = @"m.alipay.com";
    
    // 应用注册scheme,在AlixPayDemo-Info.plist定义URL types
    NSString *appScheme = @"AliPayDemo";
    
    //将商品信息拼接成字符串
    NSString *orderSpec = [order description];
    NSLog(@"orderSpec = %@",orderSpec);
    
    //获取私钥并将商户信息签名,外部商户可以根据情况存放私钥和签名,只需要遵循RSA签名规范,并将签名字符串base64编码和UrlEncode
    id<DataSigner> signer = CreateRSADataSigner(PartnerPrivKey);
    NSString *signedString = [signer signString:orderSpec];
    
    //将签名成功字符串格式化为订单字符串,请严格按照该格式
    NSString *orderString = nil;
    if (signedString != nil) {
        orderString = [NSString stringWithFormat:@"%@&sign=\"%@\"&sign_type=\"%@\"",
                       orderSpec, signedString, @"RSA"];
    
        [[AlipaySDK defaultService] payOrder:orderString fromScheme:appScheme callback:^(NSDictionary *resultDic) {
            NSLog(@"reslut = %@",resultDic);
        }];
    }

7.Xcode设置URL scheme

> iPhone SDK可以把你的App和一个自定义的URL Scheme绑定。该URL Scheme可用来从浏览器或别的App启动你的App。配置方法：打开info.plist文件，找到或者添加如图所示的键值对：

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTQ5NTBkMTJmZjY5ZTM4NzQucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

1389022-828936b74bdd6566.png

**URL Scheme值为代码中对应的值，必须一致**

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTExNjAwOTE0MjdiOTM2NzAucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy82MzMvZm9ybWF0L3dlYnA][]

屏幕快照 2017-04-13 下午7.13.47.png

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
    {
        //如果极简开发包不可用，会跳转支付宝钱包进行支付，需要将支付宝钱包的支付结果回传给开发包
        if ([url.host isEqualToString:@"safepay"]) {
            [[AlipaySDK defaultService] processOrderWithPaymentResult:url standbyCallback:^(NSDictionary *resultDic) {
        //【由于在跳转支付宝客户端支付的过程中，商户app在后台很可能被系统kill了，所以pay接口的callback就会失效，请商户对standbyCallback返回的回调结果进行处理,就是在这个方法里面处理跟callback一样的逻辑】
                NSLog(@"result = %@",resultDic);
            }];
        }
        if ([url.host isEqualToString:@"platformapi"]){//支付宝钱包快登授权返回authCode
    
            [[AlipaySDK defaultService] processAuthResult:url standbyCallback:^(NSDictionary *resultDic) {
                //【由于在跳转支付宝客户端支付的过程中，商户app在后台很可能被系统kill了，所以pay接口的callback就会失效，请商户对standbyCallback返回的回调结果进行处理,就是在这个方法里面处理跟callback一样的逻辑】
                NSLog(@"result = %@",resultDic);
            }];
        }
        return YES;
    }

### 3.微信支付 ###

> 需要提供公司资质或者营业执照，个人无法申请
> 
>  *  微信开放平台：[https://open.weixin.qq.com][https_open.weixin.qq.com]
>  *  微信支付商户平台：[https://pay.weixin.qq.com/index.php][https_pay.weixin.qq.com_index.php]
>  *  “ 开发平台与商户平台 ” 的申请详情参考 开发笔记（八）[https://www.jianshu.com/p/0f483bd55512][https_www.jianshu.com_p_0f483bd55512]

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLWE2MWJjZGUyNzE5M2NlM2IucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

微信支付总体流程图

App部分流程

1.下载微信SDK文件，如果在项目中应使用SDK的最新版

> 官方资源下载地址：[https://open.weixin.qq.com/cgi-bin/showdocument?action=dir\_list&t=resource/res\_list&verify=1&id=open1419319164&token=&lang=zh\_CN][https_open.weixin.qq.com_cgi-bin_showdocument_action_dir_list_t_resource_res_list_verify_1_id_open1419319164_token_lang_zh_CN]

2.Xcode设置URL scheme

> 在Xcode中，选择你的工程设置项，选中“TARGETS”一栏，在“info”标签栏的“URL type“添加“URL scheme”为你所注册的应用程序id（如下图所示）

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTE4Njg4NDU2MDRkNGNlODMucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

设置APPID

3.AppDelegate中

1.导入头文件与协议
    #import "WXApi.h" 
    @interface AppDelegate ()<WXApiDelegate>
    @end

2.要使你的程序启动后微信终端能响应你的程序，必须在代码中向微信终端注册你的id。（如下图所示，在 AppDelegate 的 didFinishLaunchingWithOptions 函数中向微信注册id）
    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
        // Override point for customization after application launch.
        //向微信注册
        [WXApi registerApp:@"wx7424d0308e408a87"];
        return YES;
    }

3.重写AppDelegate的handleOpenURL和openURL方法：
    - (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {
    
        return  [WXApi handleOpenURL:url delegate:self];
    }
    
    - (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {
    
        return [WXApi handleOpenURL:url delegate:self];
    }

4.实现和微信终端交互的具体请求与回应，因此需要实现WXApiDelegate协议的相关方法；onReq是微信终端向第
      三方程序发起请求，要求第三方程序响应。第三方程序响应完后必须调用sendRsp返回。在调用sendRsp返回
      时，会切回到微信终端程序界面
    - (void) onResp:(BaseResp*)resp {
        
        if ([self.wxdelegate respondsToSelector:@selector(onResp:)]) {
            [self.wxdelegate onResp:resp];
        }
    }

4.在有微信支付按钮页面

> 导入：\#import "WXApi.h"、\#import "AppDelegate.h"；  
> 添加协议：WXApiDelegate

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLWEwYWZhZTgzOTMxOTI5MDgucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

微信支付按钮的回调：调用后台接口

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLWQ0ZDkzNzlhMzQ5ODNiNTQucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

网络请求返回的结果

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTE2YTA1MzYzZTFmMTgwNzMucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

图片.png

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTNhNDA1NGE5M2FkNDdiYmUucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy82OTMvZm9ybWF0L3dlYnA][]

图片.png

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLWNlMzk2NjdjN2ZkNzEwNDcucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8zODQvZm9ybWF0L3dlYnA][]

跳转到微信支付页面

1.  支付相关错误，例如后台做签名的时候只做了一次，没有二次签名，导致的报错如下图

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLWYzZmVlNTkxNjhiODlmYTAucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy80MzgvZm9ybWF0L3dlYnA][]

签名错误

1.  App端调用后台接口唤醒微信的时候所需要的参数

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTBkYzlmOWRjNGJkNTA5OWYuanBlZz9pbWFnZU1vZ3IyL2F1dG8tb3JpZW50L3N0cmlwJTdDaW1hZ2VWaWV3Mi8yL3cvOTUxL2Zvcm1hdC93ZWJw][]

前端调用的参数

> 相关链接：  
> 1.[https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=8\_5][https_pay.weixin.qq.com_wiki_doc_api_app_app.php_chapter_8_5]  
> 2.[https://open.weixin.qq.com/cgi-bin/showdocument?action=dir\_list&t=resource/res\_list&verify=1&id=1417694084&token=&lang=zh\_CN][https_open.weixin.qq.com_cgi-bin_showdocument_action_dir_list_t_resource_res_list_verify_1_id_1417694084_token_lang_zh_CN]  
> 3.[https://www.jianshu.com/p/cf1338475675][https_www.jianshu.com_p_cf1338475675]

## 3.应用内支付（In-App Purchase） ##

> 在应用程序内购买虚拟商品。如果你在App Store上销售的应用程序，将收到支付金额的70％

相关资料

如果需要测试的话，需要申请一个沙盒测试账号；  
沙盒测试账号：[352135598@qq.com][352135598_qq.com] 密码：Test1234phone

内购流程

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTFmZjVlNjBmOGQ1NWQzMjUucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

1389022-53a1af821df0fe2e.png

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLWM5N2QyMmMyMmY1MDJlY2QucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy82NDUvZm9ybWF0L3dlYnA][]

1389022-d1a9da29fc9b9eda.png

配置App ID

> 1.为应用建立建立一个不带通配符的App ID  
> 2.用该App ID生成和安装相应的Provisioning Profile文件

配置iTunes Connect

*  1.填写相关的税务，银行，联系人信息

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTUwYjUwYTZmOTEzNmIyN2YucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

1389022-a811c1ad75b5a2fe.png

参考链接：[iOS App提交指南(二)-协议、税务和银行业务][iOS App_-]

*  2.添加一个用于在sandbox付费的测试用户

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLWJlNGQ3MjkyMmQyMjVhZjIucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

1389022-a178f6a17a29460b.png

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTgxNjg0YTA4MjdlOTdmODIucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

1389022-4dc3620e6acae00f.png

*  3.用该App ID创建一个新的应用
 *  4.创建应用内付费项目，选择付费类型

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTBkMzA2ODdlYTg5MmMzNWMucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

1389022-e9e56b0e7ded7bc7.png

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLWNkYzQwZDllOTk3NTY0MzEucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

1389022-e655efd7a8731f9a.png

解释一下这几种类型：

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTVhNTZmY2ZiZjJlNDY0YzIucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy82NjYvZm9ybWF0L3dlYnA][]

屏幕快照 2017-04-13 下午7.38.26.png

App 内购买项目摘要填写

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTdkYmU4YTg0MGZhNGZhYzYucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

1389022-67a3bdc7d0a0103a.png

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTYzOGYxZTlmODFjZDg1ZTQucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

1389022-52a03a11deb265a3.png

主要代码实现如下：

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xMzg5MDgyLTQ1NTY4OWQxYjcxNzIzYmQucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy82NTAvZm9ybWF0L3dlYnA][]

屏幕快照 2017-04-13 下午7.40.28.png

//在内购项目中创建的商品单号
    #define ProductID_IAP_FTHJ @"com.1000phone.IAPDemo.fthj_purple" // 方天画戟 488元
    #define ProductID_IAP_XYJ @"com.1000phone.IAPDemo.xyj" // 轩辕剑 6,498元
    #define ProductID_IAP_JB @"com.1000phone.IAPDemo.jb" // 金币 6元=6金币

3.制作界面，展示所有的应用内付费项目。这些应用内付费项目的价格和介绍信息可以从App Store服务器请求，也可以是自己的服务器返回。向App Store查询速度非常慢，通常需要2-3秒钟，最好从服务器请求

- (void)createViews
    {
        NSArray * buttonNames = @[@"轩辕剑 6498元", @"方天画戟 488元", @"金币6元=6金币"];
        __weak typeof(self) weakSelf = self;
        [buttonNames enumerateObjectsUsingBlock:^(NSString * buttonName, NSUInteger idx, BOOL * stop) {
            UIButton * button = [UIButton buttonWithType:UIButtonTypeSystem];
            [weakSelf.view addSubview:button];
            button.frame = CGRectMake(100, 100 + idx   * 60, 150, 50);
            button.titleLabel.font = [UIFont systemFontOfSize:18];
            [button setTitle:buttonName forState:UIControlStateNormal];
    
            // 设置tag值
            button.tag = PAY_BUTTON_BEGIN_TAG + idx;
            [button addTarget:self action:@selector(buyProduct:) forControlEvents:UIControlEventTouchUpInside];
        }];
    }
    
    - (void)buyProduct:(UIButton *) sender
    {
    
    }

4.当用户点击了一个IAP项目，我们先查询用户是否允许应用内付费

- (void)buyProduct:(UIButton *) sender
    {
        self.buyType = sender.tag - PAY_BUTTON_BEGIN_TAG;
        if ([SKPaymentQueue canMakePayments]) {
            // 执行下面提到的第5步：
            [self requestProductData];
            NSLog(@"允许程序内付费购买");
        }
        else
        {
            NSLog(@"不允许程序内付费购买");
            UIAlertView *alerView =  [[UIAlertView alloc] initWithTitle:@"提示"
                                                                message:@"您的手机没有打开程序内付费购买"
                                                               delegate:nil cancelButtonTitle:NSLocalizedString(@"关闭",nil) otherButtonTitles:nil];
    
            [alerView show];
    
        }
    }

5.我们先通过该IAP的ProductID向AppStore查询，获得SKPayment实例，然后通过SKPaymentQueue的 addPayment方法发起一个购买的操作

// 下面的ProductId应该是事先在itunesConnect中添加好的，已存在的付费项目。否则查询会失败。
    - (void)requestProductData {
       NSLog(@"---------请求对应的产品信息------------");
       NSArray *product = nil;
       switch (self.buyType) {
           case 0:
               product = [NSArray arrayWithObject:ProductID_IAP_XYJ];
               break;
           case 1:
               product = [NSArray arrayWithObject:ProductID_IAP_FTHJ];
               break;
           case 2:
               product = [NSArray arrayWithObject:ProductID_IAP_JB];
               break;
       }
       NSSet *nsset = [NSSet setWithArray:product];
       SKProductsRequest *request=[[SKProductsRequest alloc] initWithProductIdentifiers: nsset];
       request.delegate=self;
       [request start];
    }
    
    #pragma mark - SKProductsRequestDelegate
    // 收到的产品信息回调
    - (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response{
    
       NSLog(@"-----------收到产品反馈信息--------------");
       NSArray *myProduct = response.products;
       if (myProduct.count == 0) {
           NSLog(@"无法获取产品信息，购买失败。");
           return;
       }
       NSLog(@"产品Product ID:%@",response.invalidProductIdentifiers);
       NSLog(@"产品付费数量: %d", (int)[myProduct count]);
       // populate UI
       for(SKProduct *product in myProduct){
           NSLog(@"product info");
           NSLog(@"SKProduct 描述信息%@", [product description]);
           NSLog(@"产品标题 %@" , product.localizedTitle);
           NSLog(@"产品描述信息: %@" , product.localizedDescription);
           NSLog(@"价格: %@" , product.price);
           NSLog(@"Product id: %@" , product.productIdentifier);
       }
       SKPayment * payment = [SKPayment paymentWithProduct:myProduct[0]];
       NSLog(@"---------发送购买请求------------");
       [[SKPaymentQueue defaultQueue] addPayment:payment];
    
    }
    
    //弹出错误信息
    - (void)request:(SKRequest *)request didFailWithError:(NSError *)error{
       NSLog(@"-------弹出错误信息----------");
       UIAlertView *alerView =  [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Alert",NULL) message:[error localizedDescription]
                                                          delegate:nil cancelButtonTitle:NSLocalizedString(@"Close",nil) otherButtonTitles:nil];
       [alerView show];
    
    }
    
    -(void) requestDidFinish:(SKRequest *)request
    {
       NSLog(@"----------反馈信息结束--------------");
    
    }

6.在viewDidLoad方法中，将购买页面设置成购买的Observer

- (void)viewDidLoad {
        [super viewDidLoad];
        [self createViews];
        // 监听购买结果
        [[SKPaymentQueue defaultQueue] addTransactionObserver:self];
    }
    
    - (void)dealloc
    {
        [[SKPaymentQueue defaultQueue] removeTransactionObserver:self];
    }

7.当用户购买的操作有结果时，就会触发下面的回调函数，相应进行处理即可

#pragma mark - SKPaymentTransactionObserver
    // 处理交易结果
    - (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions {
        for (SKPaymentTransaction *transaction in transactions)
        {
            switch (transaction.transactionState)
            {
                case SKPaymentTransactionStatePurchased://交易完成
                    NSLog(@"transactionIdentifier = %@", transaction.transactionIdentifier);
                    [self completeTransaction:transaction];
                    break;
                case SKPaymentTransactionStateFailed://交易失败
                    [self failedTransaction:transaction];
                    break;
                case SKPaymentTransactionStateRestored://已经购买过该商品
                    [self restoreTransaction:transaction];
                    break;
                case SKPaymentTransactionStatePurchasing:      //商品添加进列表
                    NSLog(@"商品添加进列表");
                    break;
                default:
                    break;
            }
        }
    
    }
    
    // 交易完成
    - (void)completeTransaction:(SKPaymentTransaction *)transaction {
        NSString * productIdentifier = transaction.payment.productIdentifier;
        
        NSLog(@"交易完成Identifier %@", transaction.transactionIdentifier);
        
        
        NSURL *receiptFileURL = [[NSBundle mainBundle] appStoreReceiptURL];
        NSData *receiptData = [NSData dataWithContentsOfURL:receiptFileURL]; // Returns valid NSData object
        NSString* receipt =[receiptData base64EncodedStringWithOptions:0]; //base64方式编码
    
        if ([productIdentifier length] > 0) {
            // 向自己的服务器验证购买凭证
        }
    
        // Remove the transaction from the payment queue.
        [[SKPaymentQueue defaultQueue] finishTransaction: transaction];
    
    }
    
    // 交易失败
    - (void)failedTransaction:(SKPaymentTransaction *)transaction {
        if(transaction.error.code != SKErrorPaymentCancelled) {
            NSLog(@"购买失败");
        } else {
            NSLog(@"用户取消交易");
        }
        [[SKPaymentQueue defaultQueue] finishTransaction: transaction];
    }
    
    // 已购商品
    - (void)restoreTransaction:(SKPaymentTransaction *)transaction {
        // 对于已购商品，处理恢复购买的逻辑
        [[SKPaymentQueue defaultQueue] finishTransaction: transaction];
    }

8.服务器验证凭证(Optional)。如果购买成功，我们需要将凭证发送到服务器上进行验证。考虑到网络异常情况，iOS端的发送凭证操作应该进行持久化，如果程序退出，崩溃或网络异常，可以恢复重试

### 参考链接： ###

1.iOS第三方支付（支付宝、微信）[http://www.jianshu.com/p/461c82712570][http_www.jianshu.com_p_461c82712570]  
2.iOS开发内购全套图文教程[http://www.jianshu.com/p/86ac7d3b593a][http_www.jianshu.com_p_86ac7d3b593a]  
3.iOS应用内付费(IAP)开发步骤列表（唐巧）[http://blog.devtang.com/2012/12/09/in-app-purchase-check-list/][http_blog.devtang.com_2012_12_09_in-app-purchase-check-list]  
4.iOS内购实现及测试Check List支付[https://onevcat.com/2013/11/ios-iap-checklist][https_onevcat.com_2013_11_ios-iap-checklist]

[https_www.jianshu.com_p_8eb14edca8fb]: https://www.jianshu.com/p/8eb14edca8fb
[https_open.alipay.com_platform_home.htm]: https://open.alipay.com/platform/home.htm
[https_docs.open.alipay.com_200_105310]: https://docs.open.alipay.com/200/105310
[https_doc.open.alipay.com_doc2_detail_treeId_59_articleId_103563_docType_1]: https://doc.open.alipay.com/doc2/detail?treeId=59&articleId=103563&docType=1
[https_b.alipay.com_newIndex.htm]: https://b.alipay.com/newIndex.htm
[https_doc.open.alipay.com_doc2_detail_treeId_54_articleId_103419_docType_1]: https://doc.open.alipay.com/doc2/detail?treeId=54&articleId=103419&docType=1
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[https_open.weixin.qq.com]: https://open.weixin.qq.com
[https_pay.weixin.qq.com_index.php]: https://pay.weixin.qq.com/index.php
[https_www.jianshu.com_p_0f483bd55512]: https://www.jianshu.com/p/0f483bd55512
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[https_open.weixin.qq.com_cgi-bin_showdocument_action_dir_list_t_resource_res_list_verify_1_id_open1419319164_token_lang_zh_CN]: https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=open1419319164&token=&lang=zh_CN
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[https_pay.weixin.qq.com_wiki_doc_api_app_app.php_chapter_8_5]: https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=8_5
[https_open.weixin.qq.com_cgi-bin_showdocument_action_dir_list_t_resource_res_list_verify_1_id_1417694084_token_lang_zh_CN]: https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=1417694084&token=&lang=zh_CN
[https_www.jianshu.com_p_cf1338475675]: https://www.jianshu.com/p/cf1338475675
[352135598_qq.com]: mailto:352135598@qq.com
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[iOS App_-]: https://www.jianshu.com/p/c7cf65911bc1
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[http_www.jianshu.com_p_461c82712570]: https://www.jianshu.com/p/461c82712570
[http_www.jianshu.com_p_86ac7d3b593a]: https://www.jianshu.com/p/86ac7d3b593a
[http_blog.devtang.com_2012_12_09_in-app-purchase-check-list]: http://blog.devtang.com/2012/12/09/in-app-purchase-check-list/
[https_onevcat.com_2013_11_ios-iap-checklist]: https://onevcat.com/2013/11/ios-iap-checklist/