1、新建项目“AliDemo”

2、引入sdk、资源文件、openssl、util、order文件

3、引入系统框架

4、在触发事件中写入代码，如ViewController.m按钮的点击事件- (IBAction)payBtnClick:(id)sender {}

5、注册Schemes,加入白名单，Info --> URL Types 

6、运行发现剩余问题

6.1 Cannot find interface declaration for 'NSObject', superclass of 'Base64'

创建pct文件-->引入<Foundation/Foundation.h>-->Build Settings-->搜索prefix -->Prefix Header --> 输入$(SRCROOT)/项目名/.pch文件名

6.2  'openssl/asn1.h' file not found

Build Setting --> Search Path --> Header Search Paths --> 输入openssl文件的上一级路径

6.3 "_BIO_free_all", referenced from:

      "_BIO_new", referenced from:

      "_BIO_s_file", referenced from:

如果出现6.3错误，是因为第二步忘了导入.a文件 

6.4  base64.h和base64.m出错，建立pct文件，引入Foundation系统框架.