iOS H5微信支付总结

功能描述

1、webView加载H5页面
2、点击微信支付，调起微信客户端支付
3、支付完成，返回APP

操作流程

1、调起微信的项目设置

选中‘TARGETS’一栏，在‘info’中的‘LSApplicationQueriesSchemes’添加‘weixin’，已添加过的可以忽略此步骤

2、H5拦截微信支付请求，跳转微信
2.1 WKWebView

// 实际使用时可以拦截weixin://wap/pay前缀的判断
#pragma mark - WKNavigationDelegate
//! WKWeView在每次加载请求前会调用此方法来确认是否进行请求跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {// 先打印此方法拦截的所有请求// NSLog(@"\n ==== %@" ,navigationAction.request.URL.absoluteString);// decisionHandler(WKNavigationActionPolicyAllow);// return ;NSURLRequest *request        = navigationAction.request;NSString     *scheme         = [request.URL scheme];if (![scheme isEqualToString:@"https"] && ![scheme isEqualToString:@"http"]) {if ([scheme isEqualToString:@"weixin"]) {decisionHandler(WKNavigationActionPolicyCancel);BOOL canOpen = [[UIApplication sharedApplication] canOpenURL:request.URL];if (canOpen) {[[UIApplication sharedApplication] openURL:request.URL];}return;}decisionHandler(WKNavigationActionPolicyAllow);}decisionHandler(WKNavigationActionPolicyAllow);
}

2.2 UIWebView

NSString *reqUrl = request.URL.absoluteString;if ([reqUrl hasPrefix:@"weixin://"]) {if([[UIApplication sharedApplication] openURL:[NSURL URLWithString:reqUrl]]) {[[UIApplication sharedApplication] openURL:[NSURL URLWithString:reqUrl]];} else {[DLLoading DLToolTipInWindow:@"请安装微信"];return NO;}}

3、APP端更改redirect_url，实现回到APP

调用支付的时候一定会有一条URL：:https://wx.tenpay.com/cgi-bin/mmpayweb-bin/checkmweb&redirect_url =**********,通过测试得出支付返回的时候会加载redirect_url，当你的redirect_url是网址的时候，必定会跳转到浏览器，浏览器有个特性就是当你的url是****://的时候，会查找你的schemes(iOS系统应该在跳转浏览器之前自己有了判断是网址才进浏览器，****://直接会调用APP)，从而可以跳转到APP，所以要修改这个redict_url的值为你的schemes的值加上://，就实现跳转回APP。

3.1 WKWebView

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {NSURLRequest *request = navigationAction.request;NSString *absoluteString = [navigationAction.request.URL.absoluteString stringByRemovingPercentEncoding];// 拦截WKWebView加载的微信支付统一下单链接, 将redirect_url参数修改为唤起自己App的URLSchemeif ([absoluteString hasPrefix:@"https://wx.tenpay.com/cgi-bin/mmpayweb-bin/checkmweb"] && ![absoluteString hasSuffix:[NSString stringWithFormat:@"redirect_url=a1.company.com://wxpaycallback/"]]) {decisionHandler(WKNavigationActionPolicyCancel);NSString *redirectUrl = nil;if ([absoluteString containsString:@"redirect_url="]) {NSRange redirectRange = [absoluteString rangeOfString:@"redirect_url"];redirectUrl = [[absoluteString substringToIndex:redirectRange.location] stringByAppendingString:[NSString stringWithFormat:@"redirect_url=a1.company.com://wxpaycallback/"]];} else {redirectUrl = [absoluteString stringByAppendingString:[NSString stringWithFormat:@"redirect_url=a1.company.com://wxpaycallback/"]];}NSMutableURLRequest *newRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:redirectUrl] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:30];newRequest.allHTTPHeaderFields = request.allHTTPHeaderFields;newRequest.URL = [NSURL URLWithString:redirectUrl];[webView loadRequest:newRequest];return;}decisionHandler(WKNavigationActionPolicyAllow);return;
}

3.2UIWebView

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {static const NSString*schemeString =@"a1.company.com";static const NSString*redirectString =@"redirect_url";//更改微信参数redirect_urlif ([reqUrl hasPrefix:jumpString] && ![reqUrl containsString:changeredirectString]) {dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{dispatch_async(dispatch_get_main_queue(), ^{NSRange redirectRange = [reqUrl rangeOfString:@"redirect_url"];//更改reidrect_url为scheme地址NSString *redirectUrl = [[reqUrl substringToIndex:redirectRange.location] stringByAppendingString:changeredirectString];//记录本来跳转的地址 用于APP回来之后的刷新NSArray *reloadArr = [reqUrl componentsSeparatedByString:@"redirect_url="];if (reloadArr.count > 1) {self.reloadURL = [[reloadArr lastObject] stringByRemovingPercentEncoding];} else {self.reloadURL = [NSString stringWithFormat:@"https:%@",schemeString];}//发送请求NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:redirectUrl] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10.0];[request setHTTPMethod:@"GET"];//referer为空会提示"出现商家参数格式有误，请联系商家解决"//设置Referer 此地址必须注册到商户后台[request setValue:@"jxjywechat.cdeledu.com://" forHTTPHeaderField:@"Referer"];[self.webView loadRequest:request];});});return NO;}

注：a1.company.com 为微信后台注册二级域名（服务端人员提供）
一级域名也可以，其中一级域名格式www.xxx.com,二级域名格式xxx.xxx.com
[request setValue:a1.company.com :// forHTTPHeaderField: @"Referer"];
这个a1.company.com :// 后面的://一定要加，这个实际是你要跳转的地址，就是你支付后回跳到你的APP的地址

4、重新加载正确的url

上一步回来的时候是个白屏，因为你的url是错误的，H5也不能识别，所以我们要重新加载之前保存的正确的url

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {NSString *reqUrl = request.URL.absoluteString;if ([reqUrl isEqualToString:[NSString stringWithFormat:@"%@://",schemeString]]) {dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{dispatch_async(dispatch_get_main_queue(), ^{NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:self.reloadURL] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10.0];[self.webView loadRequest:request];});});return NO;}
return YES;
}

5、URL Types配置

选中‘TARGETS’一栏，在‘info’中的‘URL Types’添加一项，URL Schemes 填写‘a1.company.com’

6、支付取消或完成后跳转到APP内

也可以在payResult中执行step4的操作

AppDelegate中实现
// iOS 9.0
- (BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary<UIApplicationOpenURLOptionsKey,id> *)options {if ([url.absoluteString containsString:@"account.test.com://"]) {[[NSNotificationCenter defaultCenter] postNotificationName:@"test" object:url];}return YES;
}WebViewController中实现
在viewDidLoad中监听
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(payResult:) name:@"test" object:nil];- (void)payResult:(NSNotification *)noti {}

注：在shouldStartLoadWithRequest代理方法中执行的这几个操作都需要在if中return NO，否则会出现连续跳转的问题