这样，统一下单的参数已经准备好了，下面开始请求微信的下单接口：https://www.easck.com/pay/unifiedorder，现在坑又来了。按照微信的下单说明，传给微信服务器的参数必须是XML格式的数据。如果你传过这种类型的自然好办，不过我猜大多数童鞋没有传过这种类型的数据，好在AF有提供方法，不然就等着哭吧。继续看代码
+ (void)postWechatPayWithUrl:(NSString *)url
params:(id)params
andSuccess:(requestSuccessResult)successBlock
andFailure:(requestFailureResult)failureBlock{
NSString *string = [params XMLString];//这里需要导入XMLDictionary文件，里面有该方法
AFHTTPSessionManager *session = [AFHTTPSessionManager manager];
// 这里传入的XML字符串只是形似XML，但不是正确是XML格式，需要使用AF方法进行转义
session.responseSerializer = [[AFHTTPResponseSerializer alloc] init];
[session.requestSerializer setValue:@"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
[session.requestSerializer setValue:url forHTTPHeaderField:@"SOAPAction"];
[session.requestSerializer setQueryStringSerializationWithBlock:^NSString *(NSURLRequest *request, NSDictionary *parameters, NSError *__autoreleasing *error) {
return string;
}];
[session POST:url parameters:params progress:^(NSProgress * _Nonnull uploadProgress) {
} success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {
successBlock(responseObject);
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
HPError *hpError = [HPError errorWithCode:error.code desc:error.description];
failureBlock(hpError);
}];
}
按照上述的步骤，到这里就可以正常下单了，如果微信服务器返回给你的数据中有"result_code" = SUCCESS; "return_code" = SUCCESS，说明下单成功，这个步骤也到此结束。
第三步 调起微信客户端，并完成支付
如果第二步正常下单，那么微信会返回给你预支付ID，这个ID在最后的支付中至关重要，下面的代码是比较统一的，大家都这么写。
HPWechatProduct *product = [[HPWechatProduct alloc] initWithDic:result];
PayReq *req = [[PayReq alloc] init];
req.partnerId = product.partnerid;
req.prepayId = product.prepayid;
req.nonceStr = product.noncestr;
req.timeStamp = [product.timestamp intValue];
req.package = product.package;
req.sign = product.sign;
BOOL flag = [WXApi sendReq:req];
HPWechatProduct.m
- (instancetype)initWithDic:(NSDictionary *)dic{
if (self = [super init]) {
self.appid = WECHAT_SHARE_APPID;
self.partnerid = mah_id;
self.prepayid = [dic formateObjectForKey:@"prepay_id"];
self.package = @"Sign=WXPay";
self.noncestr = [AppMethod getRandomString];
self.timestamp = [self getTime];
NSMutableDictionary *dic = [NSMutableDictionary dictionary];
[dic setValue:self.appid forKey:@"appid"];
[dic setValue:self.partnerid forKey:@"partnerid"];
[dic setValue:self.prepayid forKey:@"prepayid"];
[dic setValue:self.package forKey:@"package"];
[dic setValue:self.noncestr forKey:@"noncestr"];
[dic setValue:self.timestamp forKey:@"timestamp"];
self.sign = [self partnerSignOrder:dic];
}
return self;
}
- (NSString *)partnerSignOrder:(NSDictionary*)paramDic{
NSArray *keyArray = [paramDic allKeys];
NSMutableArray *sortedKeyArray = [NSMutableArray arrayWithArray:keyArray];
[sortedKeyArray sortUsingComparator:^NSComparisonResult(NSString* key1, NSString* key2) {
return [key1 compare:key2];
}];
NSMutableString *paramString = [NSMutableString stringWithString:@""];
// 拼接成 A=B&X=Y
for (NSString *key in sortedKeyArray){
if ([paramDic[key] length] != 0){
[paramString appendFormat:@"&%@=%@", key, paramDic[key]];
}
}
if ([paramString length] > 1){
[paramString deleteCharactersInRange:NSMakeRange(0, 1)]; // remove first '&'
}
[paramString appendFormat:@"&key=%@", WeChatPARTNER_ID];
return [[AppMethod signString:paramString] uppercaseString];
}
- (NSString *)getTime{
NSTimeInterval interval = [[NSDate date] timeIntervalSince1970];
return [NSString stringWithFormat:@"%ld", (long)interval];
}
AppMethod.m
+ (NSString *)getRandomString
{
NSString *str = [NSString stringWithFormat:@"%s",genRandomString(32)];
return str;
}
