微信支付哪些事

- (void)onResp:(BaseResp *)resp {
    
    //支付返回结果，实际支付结果需要去微信服务器端查询
    NSString *strMsg = [NSString stringWithFormat:@"errcode:%d",resp.errCode];
    NSString *strTitle;
    
    if ([resp isKindOfClass:[SendMessageToWXResp class]]) {
        strTitle = [NSString stringWithFormat:@"发送媒体消息结果"];
    }
    
  if([resp isKindOfClass:[PayResp class]]){
      //支付返回结果,实际支付结果需要去微信服务站查询
      strTitle = [NSString stringWithFormat:@"支付结果"];
        switch (resp.errCode) {
            case WXSuccess:{
                strMsg = @"支付结果：成功！";
                NSLog(@"支付成功－PaySuccess，retcode = %d", resp.errCode);
                //这里应用发送通知,来清楚支付的结果
                NSNotification *notification = [NSNotification notificationWithName:ORDER_PAY_NOTIFICATION object:@"success"];
                [[NSNotificationCenter defaultCenter] postNotification:notification];
                
                break;
            }
            default:{
                strMsg = [NSString stringWithFormat:@"支付结果：失败！retcode = %d, retstr = %@", resp.errCode,resp.errStr];
                NSLog(@"错误，retcode = %d, retstr = %@", resp.errCode,resp.errStr);
                
                NSNotification *notification = [NSNotification notificationWithName:ORDER_PAY_NOTIFICATION object:@"fail"];
                [[NSNotificationCenter defaultCenter] postNotification:notification];
                break;
            }
        }
//        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:strTitle message:strMsg delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
//        [alert show];
      
    }
    
}

8.在(支付页面监听通知,并实现通知方法,告诉用户支付的结果)

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    if ([WXApi isWXAppInstalled]) {
        
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getOrderPayResult:) name:ORDER_PAY_NOTIFICATION object:nil];
        
    }
}
//微信 pay Result
- (void)getOrderPayResult:(NSNotification *)noti{

    if ([noti.object isEqualToString:@"success"])
    {
        [self alert:@"恭喜" msg:@"您已成功支付啦!"];
    }
    else
    {
        [self alert:@"提示" msg:@"支付失败"];
        
    }
}

9.支付页面的一些方法

1.随机生机字符串

- (NSString *)generateTradeNO
{
    static int kNumber = 15;
    
    NSString *sourceStr = @"0123456789ABCDEFGHIJKLMNOPQRST";
    NSMutableString *resultStr = [[NSMutableString alloc] init];
    srand(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;
}
2.//随机生成的商品订单号
- (NSString *)getOrderNumber{
    int random = arc4random()%10000;
    return [KCommon md5:[NSString stringWithFormat:@"%d",random]];
}
3.获取当前ip
+(NSString *)getIPAddress {
    NSString *address = @"error";
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = 0;
    // retrieve the current interfaces - returns 0 on success
    success = getifaddrs(&interfaces);
    if (success == 0) {
        // Loop through linked list of interfaces
        temp_addr = interfaces;
        while(temp_addr != NULL) {
            if(temp_addr->ifa_addr->sa_family == AF_INET) {
                // Check if interface is en0 which is the wifi connection on the iPhone
                if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
                    // Get NSString from C String
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                }
            }
            temp_addr = temp_addr->ifa_next;
        }
    }
    // Free memory
    freeifaddrs(interfaces);
    return address;
}

4.MD5类,注意下面代码添加商户密钥key字段[contentString appendFormat:@"key=%@",PARTNER_ID],这里需要填商户密钥

-(instancetype)initWithAppid:(NSString *)appid_key
                      mch_id:(NSString *)mch_id_key
                   nonce_str:(NSString *)noce_str_key
                  partner_id:(NSString *)partner_id
                        body:(NSString *)body_key
               out_trade_no :(NSString *)out_trade_no_key
                   total_fee:(NSString *)total_fee_key
            spbill_create_ip:(NSString *)spbill_create_ip_key
                  notify_url:(NSString *)notify_url_key
                  trade_type:(NSString *)trade_type_key{
    self = [super init];
    if (self) {
        _appid = appid_key;
        _mch_id = mch_id_key;
        _nonce_str = noce_str_key;
        _partnerkey = partner_id;
        _body = body_key;
        _out_trade_no = out_trade_no_key;
        _total_fee = total_fee_key;
        _spbill_create_ip = spbill_create_ip_key;
        _notify_url = notify_url_key;
        _trade_type = trade_type_key;
        
    }
    return self;
}
///获取sign签名
- (NSString *)getSignForMD5{
    NSMutableDictionary *dic = [NSMutableDictionary dictionary];
    [dic setValue:_appid forKey:@"appid"];
    [dic setValue:_mch_id forKey:@"mch_id"];
    [dic setValue:_nonce_str forKey:@"nonce_str"];
    [dic setValue:_body forKey:@"body"];
    [dic setValue:_out_trade_no forKey:@"out_trade_no"];
    [dic setValue:_total_fee forKey:@"total_fee"];
    [dic setValue:_spbill_create_ip forKey:@"spbill_create_ip"];
    [dic setValue:_notify_url forKey:@"notify_url"];
    [dic setValue:_trade_type forKey:@"trade_type"];
    return [self createMd5Sign:dic];
}

//创建签名
-(NSString*) createMd5Sign:(NSMutableDictionary*)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];
    }];
    //拼接字符串
    for (NSString *categoryId in sortedArray) {
        if (   ![[dict objectForKey:categoryId] isEqualToString:@""]
            && ![[dict objectForKey:categoryId] isEqualToString:@"sign"]
            && ![[dict objectForKey:categoryId] isEqualToString:@"key"]
            )
        {
            [contentString appendFormat:@"%@=%@&", categoryId, [dict objectForKey:categoryId]];
        }
    }
    //添加商户密钥key字段
    [contentString appendFormat:@"key=%@", _partnerkey];
    //得到MD5 sign签名
    NSString *md5Sign =[self md5:contentString];
    
    return md5Sign;
}

//创建发起支付时的sige签名
-(NSString *)createMD5SingForPay:(NSString *)appid_key partnerid:(NSString *)partnerid_key prepayid:(NSString *)prepayid_key package:(NSString *)package_key noncestr:(NSString *)noncestr_key timestamp:(UInt32)timestamp_key{
    NSMutableDictionary *signParams = [NSMutableDictionary dictionary];
    [signParams setObject:appid_key forKey:@"appid"];
    [signParams setObject:noncestr_key forKey:@"noncestr"];
    [signParams setObject:package_key forKey:@"package"];
    [signParams setObject:partnerid_key forKey:@"partnerid"];
    [signParams setObject:prepayid_key forKey:@"prepayid"];
    [signParams setObject:[NSString stringWithFormat:@"%u",timestamp_key] forKey:@"timestamp"];
    
    NSMutableString *contentString  =[NSMutableString string];
    NSArray *keys = [signParams allKeys];
    //按字母顺序排序
    NSArray *sortedArray = [keys sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
        return [obj1 compare:obj2 options:NSNumericSearch];
    }];
    //拼接字符串
    for (NSString *categoryId in sortedArray) {
        if (   ![[signParams objectForKey:categoryId] isEqualToString:@""]
            && ![[signParams objectForKey:categoryId] isEqualToString:@"sign"]
            && ![[signParams objectForKey:categoryId] isEqualToString:@"key"]
            )
        {
            [contentString appendFormat:@"%@=%@&", categoryId, [signParams objectForKey:categoryId]];
        }
    }
    //添加商户密钥key字段
    [contentString appendFormat:@"key=%@",PARTNER_ID];
    //    NSString *signString =[self md5:contentString];
    NSString *result = [self md5:contentString];
    return result;
}

-(NSString *) md5:(NSString *)str
{
    const char *cStr = [str UTF8String];
    //加密规则，因为逗比微信没有出微信支付demo，这里加密规则是参照安卓demo来得
    unsigned char result[16]= "0123456789abcdef";
    CC_MD5(cStr, (CC_LONG)strlen(cStr), result);
    //这里的x是小写则产生的md5也是小写，x是大写则md5是大写，这里只能用大写，逗比微信的大小写验证很逗
    return [NSString stringWithFormat:
            @"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
            result[0], result[1], result[2], result[3],
            result[4], result[5], result[6], result[7],
            result[8], result[9], result[10], result[11],
            result[12], result[13], result[14], result[15]
            ];
}

10.微信支付那些坑

1.如果你微信支付代码全写上了,跳转页面只出现了一个确定按钮,不要怀疑人生,请看看是不是密钥没有填,md5签名出现了问题.

2.时间戳必须符合微信官方的规范,10位数,一定记得最后要转换成int或integer型.

暂时只发现这两个.