两个月前app中集成了微信支付功能，现在准备看着项目中自己写的代码和之前参考的文章记录下来，方便以后开发方便。之前是参考华之曦的文章。

1.准备工作

先要在微信开放平台注册申请一个商户号，好像是要300RMB，一般一到两个礼拜，时间比较久，后台弄的具体不是很清楚。

去微信公众平台下载微信SDK，将

1EF653AA-13F4-4C8E-8DC0-3A89FB44B169.png

这几个拖到项目中去，readme可以不要（里面写的是每个版本的修改什么的，可以看一下）。将需要用上的库导入

9C833149-1C8A-49A0-9F87-0E351700273E.png

2.Appdelegate代码

导入WXApi.h、WXApiObject头文件，然后注册
[WXApi registerApp:WX_AppID];
还有支付回调方法

-(void)onResp:(BaseResp *)resp {
    if ([resp isKindOfClass:[PayResp class]]) {
        PayResp*response=(PayResp*)resp;  // 微信终端返回给第三方的关于支付结果的结构体
        switch (response.errCode) {
            case WXSuccess:
            {// 支付成功，向后台发送消息
                NSLog(@"支付成功");
                [[NSNotificationCenter defaultCenter] postNotificationName:@"WX_PaySuccess" object:nil];
            }
                break;
            case WXErrCodeCommon:
            { //签名错误、未注册APPID、项目设置APPID不正确、注册的APPID与设置的不匹配、其他异常等
                //                [MBProgressHUD showError:@"支付失败"];
                NSLog(@"支付失败");
            }
                break;
            case WXErrCodeUserCancel:
            { //用户点击取消并返回
                NSLog(@"取消支付");
                //                [MBProgressHUD showError:@"取消支付"];
            }
                break;
            case WXErrCodeSentFail:
            { //发送失败
                NSLog(@"发送失败");
                //                [MBProgressHUD showError:@"发送失败"];
            }
                break;
            case WXErrCodeUnsupport:
            { //微信不支持
                NSLog(@"微信不支持");
                //                [MBProgressHUD showError:@"微信不支持"];
            }
                break;
            case WXErrCodeAuthDeny:
            { //授权失败
                NSLog(@"授权失败");
                //                [MBProgressHUD showError:@"授权失败"];
            }
                break;
            default:
                break;
        }
    }
}

-(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];
}

3.调起支付的页面

将这几个用宏定义

9E3B264C-8D16-4BEC-BBE0-5731839EABFE.png

还有获取ip、转换xml字符创、签名加密都是用的华之曦的工具类，哈哈哈，这。。。。全是窃取别人的现有成果啊，好尴尬。哈哈哈

然后就是唤起支付的按钮点击事件了，还是看代码

-(void)payClicked{
    
    NSString *appid,*mch_id,*nonce_str,*sign,*body,*out_trade_no,*total_fee,*spbill_create_ip,*notify_url,*trade_type,*partner;
    //应用APPID
    appid = WX_AppID;
    //微信支付商户号
    mch_id = MCH_ID;
    //产生随机字符串
    nonce_str = [self generateTradeNO];
    body = _dic[@"xxx"];
    //订单号
    out_trade_no = _dic[@"xxx"];
    //交易金额        交易金额1表示0.01，所以乘100
    total_fee = @([_dic[@"xxx"]floatValue]*100).stringValue;
    
    //获取本机ip   这个就要用到工具类了
    spbill_create_ip = [getIPhoneIP getIPAddress];
   //交易通知网站      问下后台
    notify_url = @"xxxxxxxxx";
    trade_type = @"APP";
    partner = WX_ParterKey;
   //签名   也是工具类
    DataMD5 *data = [[DataMD5 alloc]initWithAppid:appid mch_id:mch_id nonce_str:nonce_str partner_id:partner body:body out_trade_no:out_trade_no total_fee:total_fee spbill_create_ip:spbill_create_ip notify_url:notify_url trade_type:trade_type];
    sign = [data getSignForMD5];
    
    NSMutableDictionary *dic = [NSMutableDictionary dictionary];
    [dic setValue:appid forKey:@"appid"];//公众账号ID
    [dic setValue:mch_id forKey:@"mch_id"];//商户号
    [dic setValue:nonce_str forKey:@"nonce_str"];//随机字符串
    [dic setValue:sign forKey:@"sign"];//签名
    [dic setValue:body forKey:@"body"];//商品描述
    [dic setValue:out_trade_no forKey:@"out_trade_no"];//订单号
    [dic setValue:total_fee forKey:@"total_fee"];//金额
    [dic setValue:spbill_create_ip forKey:@"spbill_create_ip"];//终端IP
    [dic setValue:notify_url forKey:@"notify_url"];//通知地址
    [dic setValue:trade_type forKey:@"trade_type"];//交易类型
    // 转换成xml字符串
    NSString *string = [dic XMLString];
    [self http:string];
    
}


#pragma mark - 拿到转换好的xml发送请求
- (void)http:(NSString *)xml {
    AppDelegate *delegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
    MBProgressHUD *_hud = [MBProgressHUD showHUDAddedTo:delegate.window animated:YES];
    _hud.labelText = @"正在获取支付订单...";
    AFHTTPSessionManager *manager = [AFHTTPSessionManager 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=utf-8" forHTTPHeaderField:@"Content-Type"];
   //这个是统一下单那个api
    [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 progress:^(NSProgress * _Nonnull uploadProgress) {
        
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable 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.openID = [dic objectForKey:@"appid"];
            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;
            // 签名加密
            DataMD5 *md5 = [[DataMD5 alloc] init];
            request.sign=[md5 createMD5SingForPay:request.openID partnerid:request.partnerId prepayid:request.prepayId package:request.package noncestr:request.nonceStr timestamp:request.timeStamp];
            // 调用微信
            [WXApi sendReq:request];
            //            [MBProgressHUD hideHUD];
            
        }else{
            //            LXLog(@"参数不正确，请检查参数");
            //            [MBProgressHUD hideHUD];
            //            [MBProgressHUD showError:@"支付错误！"];
            _hud.labelText = @"支付错误！";
        }
        [_hud hide:YES afterDelay:0.5];
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        _hud.labelText = @"请检查网络连接";
        [_hud hide:YES afterDelay:0.5];
    }];
    
}

- (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)paysuccess{

    for (UIViewController *temp in self.navigationController.viewControllers) {
        if ([temp isKindOfClass:[要跳转的页面 class]])
        {
            [self.navigationController popToViewController:temp animated:YES];
        }
    }
}

-(void)dealloc{
    [[NSNotificationCenter defaultCenter]removeObserver:self];
}

因为appdelegate里面支付回调里支付成功发送通知了，这里监听通知做处理，dealloc删除。

DataMD5这个工具类中要拼接商户密匙

2DB17843-0F5E-4FE3-91B3-1D0B80AD3144.png

好像就这样了，还是要多看官方SDK吧，之前看集成教程都是看不懂的，看了官方SDK之后再看教程就好了。记录下来加深一下印象