IOS中微信支、支付宝支付详解

1. 项目中遇到了微信支付和支付宝支付，现贡献详细代码，具体的参数在代码中都有详细的备注:

#import "ITMPay.h"
#import "WXApi.h"
#import <AlipaySDK/AlipaySDK.h>
#import "Order.h"//
#import "DataSigner.h"//
#import "XMLDictionary.h"//xml解析转换
#import "DataMD5.h"//MD5 加密

#pragma mark - 微信
#define WXAppId    @""  //appId，申请微信账号时获取的
#define WXAppSecret @"" //appSecret 申请app账号时获取
#define WXShangHu @""   //申请成功后获取的商户号
#define WXMiYue @""     //申请成功后获取的商户密钥

#pragma mark - 支付宝
#define AliShanghuId @""   //申请成功后获取的商户ID
#define AliShanghuUser @"" //商户支付宝账号
#define AliShanghuMiyue @""//申请成功后获取的商户密钥(私钥)

@implementation ITMPay

+(void)payWithType:(OrderPayType)type andDic:(NSMutableDictionary *)dic{
    if (type == OrderPayTypeAliy) {
        [self payWithAliPay:dic];
    }else if (type == OrderPayTypeWeixin){
        [self payWithWXWith:dic];
    }
}

#pragma mark -
#pragma mark 支付宝支付
/** 
    支付宝的支付步骤
 *  1. 根据传入的字典获取生成相应的Order,生成[order description]
 *  2. 根据私钥生成签名器：signer，并将生成的[order description]签名
 *  3. 根据1、2中生成的结果，做为orderString
 *  4. 将orderString,和appScheme(此处可以任意字符串)做为参数，调用[AlipaySDK defaultService] payOrder:fromScheme: callback 进行支付
 */
+ (void)payWithAliPay:(NSMutableDictionary *)dic{
    NSString *partner = AliShanghuId;
    NSString *seller = AliShanghuUser;
    NSString *privateKey = AliShanghuMiyue;
    
    Order *order = [[Order alloc] init];
    order.partner = partner;
    order.seller = seller;
    
    order.tradeNO = dic[@"order_id"]; //订单ID（由商家自行制定）
    order.productName = dic[@"order_title"]; //商品标题
    order.productDescription = dic[@"order_desc"]; //商品描述
    order.amount = dic[@"order_price"]; //商品价格
    
    order.service = @"mobile.securitypay.pay";//支付宝支付服务器名称
    order.paymentType = @"1";
    order.inputCharset = @"utf-8";
    order.itBPay = @"30m";
    order.showUrl = @"m.alipay.com";
    
    NSString *appScheme = @"alisdkdemo";
    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(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) {
            
            UIAlertView *aler = [[UIAlertView alloc]initWithTitle:@"提示" message:[resultDic[@"resultStatus"] isEqualToString:@"9000"]? @"交易成功":@"交易失败" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles: nil];
            [aler show];
        }];
        
    }
}
/**
 *  和支付宝支付相比，微信支付步骤要复杂些
 *  1. 配置传入字典的各种参数
 *  2. 将配置完的字典签名生成sign,并且将这个sign做为传入字典的sign值
 *  3. 再次将这个dic转换成XML的格式
 *  4. 将生成的XML格式的字符串做为参数访问微信接口
 *  5. 将微信服务器返回值，做为sendReq的的Value
 *  6. 将sendReq.sign进行MD5加密,
 */

#pragma mark 微信支付
+ (void)payWithWXWith:(NSMutableDictionary *)dic{
    [dic setValue:WXAppId forKey:@"appid"];   //APPid
    [dic setValue:WXShangHu forKey:@"mch_id"];//商户号Id
    [dic setValue:@"APP" forKey:@"trade_type"];//交易类型
    
    int value = arc4random();
    [dic setValue:[NSString stringWithFormat:@"%d",value] forKey:@"nonce_str"];//随机字符串
    
    [dic setValue:@"http://10.2.10.122/itm_app/payReturnContrller/Paymentcompletion.htmls" forKey:@"notify_url"];//回调地址
    
    [dic setValue:@"111.204.81.66" forKey:@"spbill_create_ip"];//终端IP
    
    //获取签名
    NSString *sign = [self signWithDic:dic];
    [dic setValue:sign forKey:@"sign"];//签名
    NSString *xml = [dic XMLString];//把签名转成xml格式
    [self httpWithXml:xml];
}

#pragma mark -
#pragma mark 调用微信支付
+ (void)httpWithXml:(NSString *)xml{
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    
    //这里传入的xml字符串只是形似xml，但是不是正确是xml格式，需要使用af方法进行转义
    manager.responseSerializer = [[AFHTTPResponseSerializer alloc] init];
    [manager.requestSerializer setValue:@"text/xml; charset=GBK" forHTTPHeaderField:@"Content-Type"];
    [manager.requestSerializer setValue:@"https://api.mch.weixin.qq.com/pay/unifiedorder" forHTTPHeaderField:@"SOAPAction"];
    
    [manager.requestSerializer setQueryStringSerializationWithBlock:^NSString *(NSURLRequest *request, NSDictionary *parameters, NSError *__autoreleasing *error) {
        return xml;
    }];
    //发起请求
    [manager POST:@"https://api.mch.weixin.qq.com/pay/unifiedorder" parameters:xml success:^(AFHTTPRequestOperation *operation, id responseObject) {
        NSString *responseString = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding] ;
        NSLog(@"responseString is %@",responseString);
        //将微信返回的xml数据解析转义成字典
        NSDictionary *dic = [NSDictionary dictionaryWithXMLString:responseString];
        //判断返回的许可
        if ([[dic objectForKey:@"result_code"] isEqualToString:@"SUCCESS"] &&[[dic objectForKey:@"return_code"] isEqualToString:@"SUCCESS"] ) {
            
            //发起微信支付，设置参数
            PayReq *request = [[PayReq alloc] init];
            request.partnerId = [dic objectForKey:@"mch_id"];
            request.prepayId= [dic objectForKey:@"prepay_id"];
            request.package = @"Sign=WXPay";
            request.nonceStr= [dic objectForKey:@"nonce_str"];
            
            //将当前事件转化成时间戳
            NSDate *datenow = [NSDate date];
            NSString *timeSp = [NSString stringWithFormat:@"%ld", (long)[datenow timeIntervalSince1970]];
            UInt32 timeStamp =[timeSp intValue];
            request.timeStamp= timeStamp;
            
            //二次签名
            DataMD5 *md5 = [[DataMD5 alloc] init];
            request.sign=[md5 createMD5SingForPay:WXAppId partnerid:request.partnerId prepayid:request.prepayId package:request.package noncestr:request.nonceStr timestamp:request.timeStamp];
            // 调用微信
            [WXApi sendReq:request];
            
        }else{
            NSLog(@"参数不正确，请检查参数");
        }
        
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"error is %@",error);
    }];

}
#pragma mark 设置签名
+ (NSString *)signWithDic:(NSDictionary *)dict{
      NSMutableString *contentString  =[NSMutableString string];

     NSArray *keys = [dict allKeys];
//     按字母顺序排序
     NSArray *sortedArray = [keys sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
     return [obj1 compare:obj2 options:NSNumericSearch];
     }];

     for (NSString *categoryId in sortedArray) {
     if (   ![[dict objectForKey:categoryId] isEqualToString:@""]
     && ![categoryId isEqualToString:@"sign"]
     && ![categoryId isEqualToString:@"key"]
     )
     {
     [contentString appendFormat:@"%@=%@&", categoryId, [dict objectForKey:categoryId]];
     }
    
     }
//   添加key字段
     [contentString appendFormat:@"key=%@",WXMiYue ];
     NSDLog(@"qianming:%@",contentString);
     
     DataMD5 *md5Sign = [[DataMD5 alloc]initWithAppid:dict[@"appid"] mch_id:dict[@"mch_id"] nonce_str:dict[@"nonce_str"] partner_id:WXMiYue body:dict[@"body"] out_trade_no:dict[@"out_trade_no"] total_fee:dict[@"total_fee"] spbill_create_ip:dict[@"spbill_create_ip"] notify_url:dict[@"notify_url"] trade_type:dict[@"trade_type"]];
     NSString *md5Sign1 =[md5Sign getSignForMD5];
     
     return md5Sign1;
}

@end