iOS WKWebView (NSURLProtocol)拦截js、css，图片资源

项目地址github：<a href="https://github.com/LiuShuoyu/HybirdWKWebVIew/">HybirdWKWebVIew</a>

HybridNSURLProtocol

一个基于WKWebView的hybirde的容器。能拦截全部WKWKWebView的的css,js,png等网络请求的demo
NSURLProtocol 子类，就能够对 app 内全部的网络请求进行:

[NSURLProtocol registerClass:[HybridNSURLProtocol class]]

但是在 WKWebView 中的请求却彻底不听从这一规则，只是象征性+ (BOOL) canInitWithRequest:(NSURLRequest *)request 方法，以后的整个请求流程彷佛就与 NSURLProtocol 彻底无关了。

使我WKWebView 的一度认为请求不遵照NSURLProtocol协议，因此不走 NSURLProtocol。这个也是很苦扰个人问题。致使咱们hybird的容器1.0也是是用UIWebVIew实现的。

但在苹果放在gittub的CustomHTTPProtocol，明显感受到WKWebview的也是遵照NSURLProtocol，要不也不会走+ (BOOL)canInitWithRequest:(NSURLRequest *)request;后来一个天天看博客和gittub的习惯帮助了我，找到一个大神的不久前开源库。

使用了WKBrowsingContextController和registerSchemeForCustomProtocol。 经过反射的方式拿到了私有的 class/selector。经过kvc取到browsingContextController。经过把注册把 http 和 https 请求交给 NSURLProtocol 处理。

[NSURLProtocol wk_registerScheme:@"http"]; [NSURLProtocol wk_registerScheme:@"https"]; 

下面直接上源代码吧

//FOUNDATION_STATIC_INLINE 属于属于runtime范畴，你的.m文件须要频繁调用一个函数,能够用static inline来声明。在SDWebImage读取内存的缓存也用到这个声明。 FOUNDATION_STATIC_INLINE Class ContextControllerClass() { static Class cls; if (!cls) { cls = [[[WKWebView new] valueForKey:@"browsingContextController"] class]; } return cls; } FOUNDATION_STATIC_INLINE SEL RegisterSchemeSelector() { return NSSelectorFromString(@"registerSchemeForCustomProtocol:"); } FOUNDATION_STATIC_INLINE SEL UnregisterSchemeSelector() { return NSSelectorFromString(@"unregisterSchemeForCustomProtocol:"); } @implementation NSURLProtocol (WebKitSupport) + (void)wk_registerScheme:(NSString *)scheme { Class cls = ContextControllerClass(); SEL sel = RegisterSchemeSelector(); if ([(id)cls respondsToSelector:sel]) { // 放弃编辑器警告 #pragma clang diagnostic push #pragma clang diagnostic ignored "-Warc-performSelector-leaks" [(id)cls performSelector:sel withObject:scheme]; #pragma clang diagnostic pop } } + (void)wk_unregisterScheme:(NSString *)scheme { Class cls = ContextControllerClass(); SEL sel = UnregisterSchemeSelector(); if ([(id)cls respondsToSelector:sel]) { // 放弃编辑器警告 #pragma clang diagnostic push #pragma clang diagnostic ignored "-Warc-performSelector-leaks" [(id)cls performSelector:sel withObject:scheme]; #pragma clang diagnostic pop } } 

注册后，客户端全部请求走+ (BOOL)canInitWithRequest:(NSURLRequest *)request。下面是打印的请求的log

+ (BOOL)canInitWithRequest:(NSURLRequest *)request { NSLog(@"request.URL.absoluteString = %@",request.URL.absoluteString); NSString *scheme = [[request URL] scheme]; if ( ([scheme caseInsensitiveCompare:@"http"] == NSOrderedSame || [scheme caseInsensitiveCompare:@"https"] == NSOrderedSame )) { //看看是否已经处理过了，防止无限循环 if ([NSURLProtocol propertyForKey:KHybridNSURLProtocolHKey inRequest:request]) return NO; return YES; } return NO; } 

Aaron Swartz

request的重写定向，request的重写定向，替换百度知道的log

+ (BOOL)canInitWithRequest:(NSURLRequest *)request { NSLog(@"request.URL.absoluteString = %@",request.URL.absoluteString); NSString *scheme = [[request URL] scheme]; if ( ([scheme caseInsensitiveCompare:@"http"] == NSOrderedSame || [scheme caseInsensitiveCompare:@"https"] == NSOrderedSame )) { //看看是否已经处理过了，防止无限循环 if ([NSURLProtocol propertyForKey:KHybridNSURLProtocolHKey inRequest:request]) return NO; return YES; } return NO; } 

这里最好加上缓存判断，加载本地离线文件， 这个直接简单的例子。

- (void)startLoading { NSMutableURLRequest *mutableReqeust = [[self request] mutableCopy]; //给咱们处理过的请求设置一个标识符, 防止无限循环, [NSURLProtocol setProperty:@YES forKey:KHybridNSURLProtocolHKey inRequest:mutableReqeust]; //这里最好加上缓存判断，加载本地离线文件， 这个直接简单的例子。 if ([mutableReqeust.URL.absoluteString isEqualToString:sourIconUrl]) { NSData* data = UIImagePNGRepresentation([UIImage imageNamed:@"medlinker"]); NSURLResponse* response = [[NSURLResponse alloc] initWithURL:self.request.URL MIMEType:@"image/png" expectedContentLength:data.length textEncodingName:nil]; [self.client URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageAllowed]; [self.client URLProtocol:self didLoadData:data]; [self.client URLProtocolDidFinishLoading:self]; } else { NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:nil]; self.task = [session dataTaskWithRequest:self.request]; [self.task resume]; } } 

下面是代码效果图

 

WechatIMG1.png

 

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项目地址：

github：<a href="https://github.com/LiuShuoyu/HybirdWKWebVIew/">HybirdWKWebVIew</a>，对您有帮助，欢迎star。

有问题反馈

在使用中有任何问题，欢迎反馈给我，能够用如下联系方式跟我交流

• github:<a href="https://github.com/LiuShuoyu/">LiuShuoyu</a>

接受启发的做者的github

github：<a href="https://github.com/yeatse/">Yeatse CC</a>苹果开发者文档：<a href="https://developer.apple.com/library/content/samplecode/CustomHTTPProtocol/Introduction/Intro.html/">apple</a>

做者：刘小弟 连接：https://www.jianshu.com/p/4fc13d4d5607 来源：简书 简书著做权归做者全部，任何形式的转载都请联系做者得到受权并注明出处。