iphone - 具有多个参数的 NSURLRequest

Question

我正在尝试设置一个 NSURLRequest 来下载一个简单的 index.html 及其 externa style.css 表，但我不太确定该怎么做。我只是将请求的 URL 格式化为我想要的文件.. 但这必须略有不同，我找不到一个很好的例子来说明我正在尝试做的事情。

到目前为止，这是我的代码:

#pragma mark - NSURLConnection methods

- (void)htmlRequest
{
    // Create the request.
    NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.mywebsite.com/index.html"]
                                              cachePolicy:NSURLRequestReloadIgnoringCacheData
                                          timeoutInterval:60.0];

    // create the connection with the request
    // and start loading the data
    NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
    if (theConnection) {
        // Create the NSMutableData to hold the received data.
        // receivedData is an instance variable declared elsewhere.
        receivedData = [NSMutableData data];
    } else {
        // Inform the user that the connection failed.
        NSLog(@"Connection Fail");
    }
}


- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    // This method is called when the server has determined that it
    // has enough information to create the NSURLResponse.

    // It can be called multiple times, for example in the case of a
    // redirect, so each time we reset the data.

    // receivedData is an instance variable declared elsewhere.
    [receivedData setLength:0];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{

    // Append the new data to receivedData.
    // receivedData is an instance variable declared elsewhere.
    [receivedData appendData:data];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    // inform the developer of error type

}

// This method uses methodName to determin which Initalizer method to send the response data to in EngineResponses.m
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
//    EngineResponses *engineResponses = [EngineResponses sharedManager];

//        [engineResponses GetManufacturers:receivedData];

    NSString *myString = [[NSString alloc] initWithData:receivedData encoding:NSUTF8StringEncoding];
    NSLog(@"%@", myString);

}

如您所见，我只是直接调用 index.html。我想知道如何格式化我的请求，以便获得 index.html 和 style.css

如有任何帮助，我们将不胜感激。

Answer 1

我总是创建一个新的数据结构，它有一个 -connection 属性和一个 -request 属性，就像这样

@interface connectionWrapper : NSObject
@property(retain) NSURLRequest *request
@property(retain) NSURLConnection *connection

通过在可变数组中保留此数据结构，您可以通过迭代数组并将每个 connectionWrapper 实例的 -connection 属性与回调方法的 connection 参数进行比较来区分回调方法中的连接，如果它们匹配(指向同一个对象)，那么您可以检索 connectionWrapper 实例的 -request 属性，然后是 NSURLRequest 实例的 -url 属性。

因为我的母语不是英语，所以我认为代码是更好的导师。

-(NSURLRequest*)getRequestByConnection:(NSURLConnection*)connection
{
    for(connectionWrapper *w in theArrayContainingAllConnectionWrappers)
    {
        if(w == connection)
            return w.request;
    }
}

在回调方法中:

-(void)connection:(NSURLConnection*)connection didReceiveResponse(NSURLResponse*)response
{
    NSURLRequest *request = [self getRequestByConnection:connection];
    NSURL *url = [request url];
    /*apply different approach to different url/*
}

PS:很遗憾 NSURLConnection 没有 -request 属性，因此我们可以轻松检索与连接关联的请求。