微信支付的demo写的乱七八糟的，各种参数名以及参数封装混乱，好不容易理清之后，写下这篇文章帮助以后要做微信支付的小伙伴少走弯路。
业务流程
业务流程
看完这张流程图可得知，我们iOS端要做的事情无非就是
- 向服务端请求预支付，获得prepayid以及noncestr
- 把参数拼起来签名
- 发起支付请求
- 处理支付结果
接入指南
相信早期做过微信分享之类的小伙伴已经很熟悉了，我不再赘述，请看iOS接入指南
开发步骤
1.向服务端请求预支付，获得prepayid以及noncestr
/**
* 微信预支付
*
* @param uid 用户id
* @param sid 学校id
* @param num 数量
* @param cid 商品id
* @param ip 客户端ip
* @param block 回调
*
* @return task
*/
+ (NSURLSessionDataTask *)getPrepayWithUid:(long)uid
sid:(NSInteger)sid
num:(NSInteger)num
cid:(long)cid
ip:(NSString *)ip
block:(void (^)(NSString *prepay_id,NSString *nonce_str, NSError *error))block
{
NSMutableDictionary *parameters = [[NSMutableDictionary alloc] init];
[parameters setObject:@(uid) forKey:@"uid"];
[parameters setObject:@(sid) forKey:@"sid"];
[parameters setObject:@(num) forKey:@"num"];
[parameters setObject:@(cid) forKey:@"cid"];
[parameters setObject:ip forKey:@"ip"];
NSString *url = @"接口名";
return [[ZXApiClient sharedClient] POST:url parameters:parameters success:^(NSURLSessionDataTask *task, id JSON) {
NSString *prepay_id = [[JSON objectForKey:@"prepay_id"] stringValue];
NSString *nonce_str = [[JSON objectForKey:@"nonce_str"] stringValue];
!block?:block(prepay_id,nonce_str,nil);
} failure:^(NSURLSessionDataTask *__unused task, NSError *error) {
!block?:block(nil,nil,error);
}];
}
以上接口只是一个示例，除了ip这个参数，其他都根据自己需求来。事实上ip这个参数也并没有什么卵用，因为我看大家都是传的都是192.168.1.1。
2.把参数拼起来签名
这里我把参数封装成一个类，用来处理各种参数拼接的方法
ZXWeixinSignParams.h
//微信开发平台应用id
#define Weixin_Appid @""
//财付通商户号
#define Weixin_MCH_ID @""
//商户号对应的密钥
#define Weixin_PARTNER_ID @""
@interface ZXWeixinSignParams : NSObject
@property (nonatomic , copy) NSString *appid;
@property (nonatomic , copy) NSString *noncestr;
@property (nonatomic , copy) NSString *package;
@property (nonatomic , copy) NSString *partnerid;
@property (nonatomic , copy) NSString *timestamp;
@property (nonatomic , copy) NSString *prepayid;
- (instancetype)initWithPrepayid:(NSString *)prepayid noncestr:(NSString *)noncestr;
- (NSString *)sign;
@end
ZXWeixinSignParams.m
@implementation ZXWeixinSignParams
- (instancetype)initWithPrepayid:(NSString *)prepayid noncestr:(NSString *)noncestr
{
self = [super init];
if (self) {
self.prepayid = prepayid;
self.noncestr = noncestr;
}
return self;
}
- (NSString *)appid
{
if (!_appid) {
_appid = Weixin_Appid;
}
return _appid;
}
- (NSString *)timestamp
{
if (!_timestamp) {
time_t now;
time(&now);
_timestamp = [NSString stringWithFormat:@"%ld", now];
}
return _timestamp;
}
- (NSString *)package
{
if (!_package) {
_package = @"Sign=WXPay";
}
return _package;
}
- (NSString *)partnerid
{
if (!_partnerid) {
_partnerid = Weixin_MCH_ID;
}
return _partnerid;
}
- (NSString *)sign
{
NSDictionary *dic = [self keyValues];
return [self createMd5Sign:[dic mutableCopy]];
}
- (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:@""]
&& ![categoryId isEqualToString:@"sign"]
&& ![categoryId isEqualToString:@"key"]
)
{
[contentString appendFormat:@"%@=%@&", categoryId, [dict objectForKey:categoryId]];
}
}
//添加key字段
[contentString appendFormat:@"key=%@", Weixin_PARTNER_ID];
//得到MD5 sign签名
NSString *md5Sign = [[contentString md5] uppercaseString];
return md5Sign;
}
@end
- (NSString *)sign方法就是拼接参数签名了。其中NSDictionary *dic = [self keyValues];这部分我使用了MJExtension很方便的字典模型转换,还有NSString *md5Sign = [[contentString md5] uppercaseString];这部分使用了我自己写的md5，demo里的可以直接拿来用。
3.发起支付请求
- (void)sendPrepay
{
MBProgressHUD *hud = [MBProgressHUD showWaiting:@"" toView:self.view];
[ZXMessageBill getPrepayWithUid:GLOBAL_UID sid:[ZXUtils sharedInstance].currentSchool.sid num:self.num cid:self.messageCommodity.cid ip:@"196.168.1.1" block:^(NSString *prepay_id, NSString *nonce_str, NSError *error) {
self.prepay_id = prepay_id;
self.nonce_str = nonce_str;
if (self.prepay_id && self.nonce_str) {
[hud hide:YES];
[self weixinpay];
} else {
[hud turnToError:@"订单提交失败，请重试"];
}
}];
}
- (void)weixinpay
{
ZXWeixinSignParams *signParams = [[ZXWeixinSignParams alloc] initWithPrepayid:self.prepay_id noncestr:self.nonce_str];
//调起微信支付
PayReq *req = [[PayReq alloc] init];
req.openID = signParams.appid;
req.partnerId = signParams.partnerid;
req.prepayId = signParams.prepayid;
req.nonceStr = signParams.noncestr;
req.timeStamp = signParams.timestamp.intValue;
req.package = signParams.package;
req.sign = [signParams sign];
[WXApi sendReq:req];
}
这样看起来是不是比demo里清爽的多呢？
4. 处理支付结果
- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url
{
if ([url.absoluteString hasPrefix:Weixin_Appid]) {
return [WXApi handleOpenURL:url delegate:self];
}
return YES;
}
- (BOOL)application:(UIApplication *)application
openURL:(NSURL *)url
sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation {
if ([url.absoluteString hasPrefix:Weixin_Appid]) {
return [WXApi handleOpenURL:url delegate:self];
}
return YES;
}
- (void)onResp:(BaseResp*)resp
{
if([resp isKindOfClass:[SendMessageToWXResp class]])
{
SendMessageToWXResp *smresp = (SendMessageToWXResp *)resp;
if (smresp.errCode == 0) {
[MBProgressHUD showSuccess:@"分享成功" toView:nil];
[ZXUmengHelper logShare];
}
} else if([resp isKindOfClass:[PayResp class]]){
//支付返回结果，实际支付结果需要去微信服务器端查询
switch (resp.errCode) {
case WXSuccess:
{
[MBProgressHUD showSuccess:@"支付成功" toView:nil];
[[NSNotificationCenter defaultCenter] postNotificationName:weixnpaySuccessNotification object:nil];
}
NSLog(@"支付成功－PaySuccess，retcode = %d", resp.errCode);
break;
default:
[MBProgressHUD showText:[NSString stringWithFormat:@"支付结果：失败！retcode = %d, retstr = %@", resp.errCode,resp.errStr] toView:nil];
NSLog(@"错误，retcode = %d, retstr = %@", resp.errCode,resp.errStr);
break;
}
}
}
在onResp里处理支付结果，成功了发个通知给viewController，失败了就弹个提示。
常见问题
如果你跳转到微信里之只弹出了一个确定按钮，那么这时候你需要检查几个方面
- appid，mch_id,partner_id是否设置正确。mch_id对应的key其实是partnerid，partner_id对应的key其实是key，微信在这里挖了个大坑，相信踩过的同学不在少数。
- timestamp 应为10位
- 签名需要排序，并用md5加密，例子里使用了全大写，小写没试过不知道会不会出问题
- 如果集成了友盟，并且友盟含有微信分享，先注册友盟，再注册微信
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