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前言
支付分APP支付、H5支付、扫码支付等。app支付一般在app中使用,并且需要集成相应的支付SDK,H5支付多用于网页。如果你的APP不想集成支付SDK,又想实现支付功能,你可以在项目中使用H5支付。本文主要讲述如何将H5支付封装成一个原生可调用的组件。
1.H5支付流程
注:以下为网页H5支付流程,原生调用需要修改部分流程
1.1 微信支付
微信中间页重新向到redirect_url
1.2 支付宝支付
2.原生封装思路
新开一个webView加载支付中间页,拦截中间页支付请求并唤起支付,然后关闭webView流程结束。
webView需要加到window(或者当前控制器的view上),并设置一个大小(肉眼不可见就行)。因为使用wkwebview时,webView不显示的情况下,H5请求会被挂起,会导致支付宝页面不能唤起支付请求。
3.代码实现
具体步骤见代码注释
@interface HJH5WebPayManager()<UIWebViewDelegate> @property (nonatomic,strong) UIWebView *payWebview; @property (nonatomic,strong) void(^sendPayResult)(HJH5SendWebPayResult); @end @implementation HJH5WebPayManager +(instancetype)sharedInstance{ static dispatch_once_t once ; static HJH5WebPayManager *_instace = nil; dispatch_once(&once, ^{ _instace = [[self alloc] init]; }); return _instace; } -(void)loadWebPayTransitionPage:(NSString *)html handleBlock:(void (^)(HJH5SendWebPayResult))handle{ NSMutableURLRequest *request = nil; if ([html hasPrefix:@"https://wx.tenpay.com"]) { //微信安全域名 NSString *wxScheme = @""; NSString *referer = [NSString stringWithFormat:@"%@://",wxScheme]; //将redirect_url替换成scheme,微信支付完毕才能跳回APP,否则会打开Safari浏览器(因为redirect_url一般为一个HTTP的地址) NSRange range = [html rangeOfString:@"redirect_url="]; NSString *reqUrl; if (range.length>0) { reqUrl = [html substringToIndex:range.location+range.length]; reqUrl = [reqUrl stringByAppendingString:referer]; }else{ reqUrl = [html stringByAppendingString:[NSString stringWithFormat:@"&redirect_url=%@",referer]]; } request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:reqUrl] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; //设置授权域名,伪造Referer头,因为微信中间页会检验Referer头,并且Referer对应的值需要包含安全域名 [request setValue:referer forHTTPHeaderField:@"Referer"]; if (self.payWebview) { [self.payWebview removeFromSuperview]; self.payWebview = nil; } self.payWebview = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 0.1, 0.1)]; self.sendPayResult = handle; [[UIApplication sharedApplication].keyWindow addSubview:self.payWebview]; self.payWebview.delegate = self; [self.payWebview loadRequest:request]; }else if ([html hasPrefix:@"<form"]){ //如果是支付宝,html对应的应该是一段form表单提交脚本,需要调用loadString方法加载 if (self.payWebview) { [self.payWebview removeFromSuperview]; self.payWebview = nil; } self.payWebview = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 0.1, 0.1)]; self.sendPayResult = handle; [[UIApplication sharedApplication].keyWindow addSubview:self.payWebview]; self.payWebview.delegate = self; NSString *payStr = html; NSString *htmlString = [NSString stringWithFormat:@"htmlString:<html> \n" "<head> \n" "<meta name=\"viewport\" content=\"initial-scale=1.0, maximum-scale=1.0, user-scalable=no\" /> \n" "<style type=\"text/css\"> \n" "body {font-size:16px;}\n" "</style> \n" "</head> \n" "<body>" "%@" "</body>" "</html>",payStr]; [self.payWebview loadHTMLString:htmlString baseURL:nil]; }else{ //非法html,返回错误 handle(HJH5SendWebPayResultOther); return; } //容错处理,20秒没唤起支付,当错误处理。 __weak typeof(self) weakSelf = self; dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(20 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ if (weakSelf.sendPayResult) { weakSelf.sendPayResult(HJH5SendWebPayResultOther); } [weakSelf endPayment]; }); } - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{ //页面加载失败,返回错误 if (self.sendPayResult) { self.sendPayResult(HJH5SendWebPayResultLoadFail); } [self endPayment]; } - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{ NSURL *url = request.URL; NSString *newUrl = url.absoluteString; //拦截微信支付请求,并打开微信 if([newUrl rangeOfString:@"weixin://wap/pay"].location != NSNotFound){ //判断是否能打开微信 if ([[UIApplication sharedApplication] canOpenURL:url]) { if (@available(iOS 10.0, *)){ [[UIApplication sharedApplication] openURL:url options:@{} completionHandler:nil]; }else{ [[UIApplication sharedApplication] openURL:url]; } if (self.sendPayResult) { self.sendPayResult(HJH5SendWebPayResultSuccess); } [self endPayment]; }else{ if (self.sendPayResult) { self.sendPayResult(HJH5SendWebPayResultSendFail); } [self endPayment]; } return NO; }else if([newUrl rangeOfString:@"alipay://alipayclient/?"].location != NSNotFound){ //拦截支付宝支付请求,并且替换fromAppUrlScheme参数为当前APP的scheme,实现支付完毕返回APP功能。 NSString *aliScheme = @"支付宝支付scheme,支付完毕可通过scheme返回到当前APP"; newUrl = [HJStringHelper decodeURL:newUrl]; NSString *parameterString = [newUrl stringByReplacingOccurrencesOfString:@"alipay://alipayclient/?" withString:@""]; NSError *error = nil; id dict = [NSJSONSerialization JSONObjectWithData:[parameterString dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingMutableContainers error:&error]; if (!error) { if ([dict isKindOfClass:[NSMutableDictionary class]]) { dict[@"fromAppUrlScheme"] = aliScheme; NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&error]; if (!error) { parameterString = [HJStringHelper escapeURL:[[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding]]; NSString *payUrl = [NSString stringWithFormat:@"alipay://alipayclient/?%@",parameterString]; dispatch_async(dispatch_get_main_queue(), ^{ //判断是否能打开支付宝 if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:payUrl]]) { if (@available(iOS 10.0, *)){ [[UIApplication sharedApplication] openURL:[NSURL URLWithString:payUrl] options:@{} completionHandler:nil]; }else{ [[UIApplication sharedApplication] openURL:[NSURL URLWithString:payUrl]]; } if (self.sendPayResult) { self.sendPayResult(HJH5SendWebPayResultSuccess); } [self endPayment]; }else{ if (self.sendPayResult) { self.sendPayResult(HJH5SendWebPayResultSendFail); } [self endPayment]; } }); } } } return NO; }else{ return YES; } } -(void)endPayment{ self.sendPayResult = nil; [self.payWebview removeFromSuperview]; self.payWebview = nil; } @end
3.1入参说明
调用该方法唤起支付-(void)loadWebPayTransitionPage:(NSString *)html handleBlock:(void (^)(HJH5SendWebPayResult))handle.
其中html为微信中间页地址和支付宝form表单脚本。如:
微信: https://wx.tenpay.com ?xxxx
支付宝:<form id=" alipaysubmit " name="alipaysubmit" action=xxxx></form><script>document.forms[' alipaysubmit '].submit();</script>
见1.H5支付流程,微信下单之后可以获取中间页地址,支付则需要form表单提交加载中间页。
3.2错误处理
typedef NS_ENUM(NSUInteger,HJH5SendWebPayResult) { HJH5SendWebPayResultSuccess = 0, //唤起登录成功 HJH5SendWebPayResultLoadFail, //支付页面加载失败 HJH5SendWebPayResultSendFail, //调起支付失败,可能是没添加未安装微信或者支付宝 HJH5SendWebPayResultOther //其他 };
支付请求发送成功则表示这次H5支付发起完成,具体支付结果需要查询后台获得。所以需要对一些异常情况进行处理,比如页面加载失败,微信或支付宝未安装等异常进行处理。
4.说明
这种方案可以统一微信和支付宝H5支付的流程,并且隐式地显示支付中间页,不会影响H5单页面应用的路由。APP不需要集成支付SDK,可以绕过苹果扫描代码。
由于支付宝支付流程改成和微信一样,所以支付宝网页支付功能被砍掉,只能通过打开支付宝APP去支付。这也是这种方案的不足之处。
iOS-APP实现微信H5支付总结
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