1. 环境配置 

1）. 从支付宝官网下载demo,新建文件夹“AliSDK”。把demo中的下列文件(AlipaySDK.bundle AlipaySDK.framework  openssl   Util   Order.h   Order.m   libcrypto.a libssl.a)复制到“AliSDK”文件中。

2）. 新建一个工程,把AliSDK 添加到工程内。

3）. 新建pch文件并添加如下信息。

4）. 添加pch文件路径

5）. 添加依赖库

6）. 添加openssl路径

到此为止  编译运行  没问题   开始敲代码

二.  编写代码

在ViewController.m中

#import "ViewController.h"#import "Order.h"#import 
    
     #import "DataSigner.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.        UIButton*button=[UIButton buttonWithType:UIButtonTypeCustom];    button.frame=CGRectMake(100, 200, 200, 50);    button.backgroundColor=[UIColor lightGrayColor];    [button setTitle:@"支付宝支付" forState:UIControlStateNormal];    [button addTarget:self action:@selector(btClick:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:button];            }-(void)btClick:(id)sender{/*     *商户的唯一的parnter和seller。     *签约后，支付宝会为每个商户分配一个唯一的 parnter 和 seller。     */        /*============================================================================*/    /*=======================需要填写商户app申请的===================================*/    /*============================================================================*/    NSString*partner=@"000000000000";//合作商户ID    NSString*seller=@"";//支付宝账户     NSString*privateKey=@"";//PKCS8格式的私钥        /*============================================================================*/    /*============================================================================*/    /*============================================================================*/    //partner和seller获取失败,提示    if (partner.length==0||seller.length==0||privateKey.length==0) {        UIAlertController*alertController=[UIAlertController alertControllerWithTitle:@"提示" message:@"缺少partner或者seller或者私钥" preferredStyle:UIAlertControllerStyleAlert];        UIAlertAction*sureAction=[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];        [alertController addAction:sureAction];        [self presentViewController:alertController animated:NO completion:nil];        }    /*     *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=partner;    order.sellerID=seller;    order.outTradeNO=[self generateTradeNO];//订单ID(由商家自定义)    order.subject=@"支付宝测试支付";//商品标题    order.body=@"支付宝测试支付数据";//商品描述    order.totalFee=@"0.01";//商品价格    //    order.notifyURL =  @"http://www.baidu.com"; //回调URL    order.service = @"mobile.securitypay.pay";    order.paymentType = @"1";    order.inputCharset = @"utf-8";//转码格式    order.itBPay = @"30m";//等待时间    order.showURL = @"m.alipay.com";        //应用注册scheme,在AlixPayDemo-Info.plist定义URL types    NSString*appScheme=@"paypast";    //将商品信息拼接成字符串    NSString*orderSpec=[order description];        //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
     
       signer = CreateRSADataSigner(privateKey);    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 = %@\n",resultDic);        }];    }}#pragma mark -#pragma mark   ==============产生随机订单号==============- (NSString *)generateTradeNO{    static int kNumber = 15;        NSString *sourceStr = @"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";    NSMutableString *resultStr = [[NSMutableString alloc] init];    srand((unsigned)time(0));    for (int i = 0; i < kNumber; i++)    {        unsigned index = rand() % [sourceStr length];        NSString *oneStr = [sourceStr substringWithRange:NSMakeRange(index, 1)];        [resultStr appendString:oneStr];    }    return resultStr;}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end
     
    

4. 设置回调

5. 回调在AppDelegate.m中

// NOTE: 9.0以后使用新API接口- (BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary
    
      *)options{    if ([url.host isEqualToString:@"safepay"]) {        //跳转支付宝钱包进行支付，处理支付结果        [[AlipaySDK defaultService] processOrderWithPaymentResult:url standbyCallback:^(NSDictionary *resultDic) {            NSLog(@"*result = *%@",resultDic);        }];    }    return YES;}