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。能拦截所有WKWKWebView的的css,js,png等网络请求的demo
NSURLProtocol 子类,就可以对 app 内所有的网络请求进行:

[NSURLProtocol registerClass:[HybridNSURLProtocol class]]

可是在 WKWebView 中的请求却完全不遵从这一规则,只是象征性+ (BOOL) canInitWithRequest:(NSURLRequest *)request 方法,之后的整个请求流程似乎就与 NSURLProtocol 完全无关了。

使我WKWebView 的一度认为请求不遵守NSURLProtocol协议,所以不走 NSURLProtocol。这个也是很苦扰我的问题。导致我们hybird的容器1.0也是是用UIWebVIew实现的。

但在苹果放在gittub的CustomHTTPProtocol,明显感觉到WKWebview的也是遵守NSURLProtocol,要不也不会走+ (BOOL)canInitWithRequest:(NSURLRequest *)request;后来一个每天看博客和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。 通过反射的方式拿到了私有的 class/selector。通过kvc取到browsingContextController。通过把注册把 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文件需要频繁调用一个函数,可以用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,客户端所有请求走+ (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;
}

iOS WKWebView (NSURLProtocol)拦截js、css,图片资源 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];
//给我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


  iOS WKWebView (NSURLProtocol)拦截js、css,图片资源 WechatIMG1.png   iOS WKWebView (NSURLProtocol)拦截js、css,图片资源 WechatIMG2.jpeg

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,可以用以下联系方式跟我交流

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

接受启发的作者的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>



作者:刘小弟
链接:https://www.jianshu.com/p/4fc13d4d5607
来源:简书
简书著作权归作者所有,任何形式的转载都请联系作者获得授权并注明出处。
上一篇:Restful framework【第十二篇】版本控制


下一篇:URL与URI之间的区别