####webView 使用URLProtocol解决 UIWebView的请求可以通过NSURLPtotol拦截，既可以拦截，也可以用本地的资源直接返回，可以实现资源本地化等各种需求，网上好多这种文章，所以此次不过多提及，主要针对WKWebView（仅考虑iOS11及以上）
####WKWebView实现类似URLProtocol方法
#####通过继承WKURLSchemeHandler的对象实现拦截
WKWebViewConfiguration类有如下方法：
WKWebViewConfiguration *configuration = [WKWebViewConfiguration new];
CustomURLSchemeHandler *handler = [CustomURLSchemeHandler new];
NSMutableDictionary *handlers = [configuration valueForKey:@"_urlSchemeHandlers"];
handlers[@"https"] = handler;//修改handler,将HTTP和HTTPS也一起拦截
handlers[@"http"] = handler; //有人说这是私有方法，但是我感觉还好吧
WKWebView *wk = [[WKWebView alloc]initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height-200) configuration:configuration];
[self.view addSubview:wk];
self.wk = wk;
[wk loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.baidu.com"]]];
自己写一个继承WKURLSchemeHandler协议的对象
#import <WebKit/WebKit.h>
NS_ASSUME_NONNULL_BEGIN
@interface CustomURLSchemeHandler : NSObject <WKURLSchemeHandler>
@end
NS_ASSUME_NONNULL_END
//这里拦截到URLScheme为customScheme的请求后，根据自己的需求,返回结果，并返回给WKWebView显示
- (void)webView:(WKWebView *)webView startURLSchemeTask:(id <WKURLSchemeTask>)urlSchemeTask{
NSURLRequest *request = urlSchemeTask.request;
NSLog(@"request = %@",request);
//如果是我们替对方去处理请求的时候
if (!manager) {
NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
manager = [[AFHTTPSessionManager alloc]initWithSessionConfiguration:config];
//这个acceptableContentTypes类型自己补充,demo不写太多
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects: @"text/html", nil];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
}
NSURLSessionDataTask *task = [manager dataTaskWithRequest:request completionHandler:^(NSURLResponse * _Nonnull response, id _Nullable responseObject, NSError * _Nullable error) {
[urlSchemeTask didReceiveResponse:response];
[urlSchemeTask didReceiveData:responseObject];
[urlSchemeTask didFinish];
}];
[task resume];
//如果是返回本地资源的话
// UIImage *image = [UIImage imageNamed:@"yang.jpg"];
// NSData *data = UIImageJPEGRepresentation(image, 1.0);
// NSURLResponse *response = [[NSURLResponse alloc] initWithURL:urlSchemeTask.request.URL MIMEType:@"image/jpeg" expectedContentLength:data.length textEncodingName:nil];
// [urlSchemeTask didReceiveResponse:response];
// [urlSchemeTask didReceiveData:data];
// [urlSchemeTask didFinish];
}
- (void)webView:(WKWebView *)webVie stopURLSchemeTask:(id)urlSchemeTask {
NSLog(@"stop = %@",urlSchemeTask);
}
@end
然后就可以实现拦截，以访问的百度网页为例，打印如下：
demo地址：