导致自定义NSURLProtocol

我正在NSURLProtocol以拦截HTTP请求。

这是自定义的NSURLProtocol类。

+ (BOOL)canInitWithRequest:(NSURLRequest *)request {
    if (NSOrderedSame != [request.URL.scheme caseInsensitiveCompare:@"http"] &&
        NSOrderedSame != [request.URL.scheme caseInsensitiveCompare:@"https"]) {
        return NO;
    }

    if ([NSURLProtocol propertyForKey:kURLProtocolRequestHandledKey inRequest:request] ) {
        return NO;
    }

    return YES;
}

+ (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request {
    NSMutableURLRequest *mutableReqeust = [request mutableCopy];
    [NSURLProtocol setProperty:@YES forKey:kURLProtocolRequestHandledKey inRequest:mutableReqeust];
    return [mutableReqeust copy];
}

- (void)startLoading {
    self.startDate = [NSDate date];
    self.data = [NSMutableData data];
    self.error = nil;

    self.connection = [[NSURLConnection alloc] initWithRequest:[[self class] canonicalRequestForRequest:self.request] delegate:self startImmediately:YES];
}

- (void)stopLoading {
    [self.connection cancel];
}

#pragma mark - NSURLConnectionDelegate

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    [[self client] URLProtocol:self didFailWithError:error];
    self.error = error;
}

- (BOOL)connectionShouldUseCredentialStorage:(NSURLConnection *)connection {
    return YES;
}

- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {
    [[self client] URLProtocol:self didReceiveAuthenticationChallenge:challenge];
}

- (void)connection:(NSURLConnection *)connection didCancelAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {
    [[self client] URLProtocol:self didCancelAuthenticationChallenge:challenge];
}

#pragma mark - NSURLConnectionDataDelegate

- (NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)response {
    if (response != nil){
        _response = response;
        NSMutableURLRequest *redirect = [request mutableCopy];
        redirect.URL = request.URL;
        [NSURLProtocol setProperty:@NO forKey:kURLProtocolRequestHandledKey inRequest:redirect];
        [[self client] URLProtocol:self wasRedirectedToRequest:redirect redirectResponse:response];

        return redirect;
    }
    return request;
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    [[self client] URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageAllowed];
    _response = response;
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [[self client] URLProtocol:self didLoadData:data];
    [self.data appendData:data];
}

- (NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse *)cachedResponse {
    return cachedResponse;
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    [[self client] URLProtocolDidFinishLoading:self];
}

- (void)connection:(NSURLConnection *)connection didSendBodyData:(NSInteger)bytesWritten totalBytesWritten:(NSInteger)totalBytesWritten totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite {

}

我添加一个UIWebView作为子视图，然后加载一个URL http://ln.clientaccess.10086.cn/shop/optical/Appointment?channel=007&PHONE_NUM=18240235054&AREA_CODE=240&key=4A35774433BA79EB950EDE4B5C4D7121 ，控制器被解散后，APP被冻结即使我在调用webView之前先调用- stopLoading ，然后再解除它。

这是线程堆栈：

---

我不认为你想修改canonicalRequest中的请求 - 单独留下。 您确实想在startLoading中对其进行修改，并在NSURLConnection的新调用中使用修改的请求，以便您的协议在该调用期间不再处理它。

第二件事是重定向实现可能是错误的 - 该方法在两种情况下被调用; 一次发送请求时（并且重定向为零）; 你想在这种情况下返回请求（你这样做）。 第二个是当你实际得到重定向时; 你想调用客户端（你是），但是你想返回零，以便让客户端实际处理重定向（否则非零返回可以表示重定向已被处理）。

我不确定其中哪一个会导致这个问题，但他们是不同的。

我唯一看到的不同于我实施的其他事情是开始立即：YES。 这是默认的，所以这不应该成为问题。 也许尝试避免缓存，看看是否有帮助，如果以上都没有。 或者确保在dealloc的连接上调用-cancel。

---

使用startImmediately:NO而不是startImmediately:YES会解决这个问题。

    if (currentRunLoop && [currentRunLoop currentMode]) {
        self.connection = [[NSURLConnection alloc] initWithRequest:[[self class] canonicalRequestForRequest:self.request] delegate:self startImmediately:NO];
        [self.connection scheduleInRunLoop:currentRunLoop forMode:[[NSRunLoop currentRunLoop] currentMode]];
        [self.connection start];

    } else {
        self.connection = [[NSURLConnection alloc] initWithRequest:[[self class] canonicalRequestForRequest:self.request] delegate:self startImmediately:YES];
    }

它是有线的。 请问有人会告诉我为什么？

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