以前NSURLProtocol可以直接拦截UIWebView,后面升级成WKWebView发现拦截不到了
有细心爱研究的老铁发现了 [WKBrowsingContextController registerSchemeForCustomProtocol:] 这个函数的存在
所以还是可以拦截的
直接上步骤
1.在控制器或者你喜欢的地方注册NSURLProtocol(调用以下代码)
Class cls = NSClassFromString(@"WKBrowsingContextController");
SEL sel = NSSelectorFromString(@"registerSchemeForCustomProtocol:");
if ([(id)cls respondsToSelector:sel]) {
[(id)cls performSelector:sel withObject:@"http"];
[(id)cls performSelector:sel withObject:@"https"];
}
[NSURLProtocol registerClass:[CustomProtocol class]];
2.在你自定义的NSURLProtocol类中实现拦截
+ (BOOL)canInitWithRequest:(NSURLRequest *)request{
NSString *abstring = request.URL.absoluteString;
if ([abstring containsString:@"你喜欢的标记"]) {
return YES;
}
return NO;
}
+ (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request
{
return request;
}
3.在你自定义的NSURLProtocol类中拦截后替换请求的内容,以下以图片为例
- (void)startLoading{
NSString *urlPathString = super.request.URL.absoluteString;
if ([urlPathString containsString:@"你喜欢的标记"]) {
urlPathString = [urlPathString stringByReplacingOccurrencesOfString:@"你喜欢的标记" withString:@"你喜欢的标记2"];
}
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlPathString]];
NSMutableDictionary *header = [NSMutableDictionary dictionary];
header[@"Content-Length"] = [NSString stringWithFormat:@"%ld",imageData.length];
NSHTTPURLResponse *response = [[NSHTTPURLResponse alloc] initWithURL:self.request.URL
statusCode:200 HTTPVersion:@"1.1" headerFields:header];
//回调
[self.client URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageAllowed];
[self.client URLProtocol:self didLoadData:imageData];
[self.client URLProtocolDidFinishLoading:self];
}
- (void)stopLoading{
NSLog(@"stop");
}