blocks|key|1144080|text|请改用ASIHTTPRequest。它比NSURLConnection更容易使用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1144081|entityMap|0|LINK|mutability|MUTABLE|url|http://allseeing-i.com/ASIHTTPRequest/^0|K|F|3|E|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

Use <a href="http://allseeing-i.com/ASIHTTPRequest/" rel="nofollow">ASIHTTPRequest</a> instead. It's much easier to use than <code>NSURLConnection</code>.

blocks|key|3411913|text|谷歌很快就抛出了这个：http://blog.emmerinc.be/index.php/2009/03/15/multiple-async-nsurlconnections-example/他正在使用一个字典来管理多个请求|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3411914|entityMap|0|LINK|mutability|MUTABLE|url|http://blog.emmerinc.be/index.php/2009/03/15/multiple-async-nsurlconnections-example/^0|B|2D|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

a quick google threw up this: <a href="http://blog.emmerinc.be/index.php/2009/03/15/multiple-async-nsurlconnections-example/" rel="nofollow">http://blog.emmerinc.be/index.php/2009/03/15/multiple-async-nsurlconnections-example/</a> he is using a dictionary to manage multiple requests

blocks|key|1149751|text|对每个已经是多线程的NSURLConnection使用单独的线程不是一个好主意。它只是毫无意义地使用系统资源，并挫败NSURLConnections试图以最佳方式管理连接。但是，它确实可以工作，所以如果您没有收到委托消息，则说明您做错了什么。与其找一个替代的方法来做这件事，不如试着找出运行循环问题的根源。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1149752|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Using a separate thread for each NSURLConnection, which is already multithreaded is a bad idea. It's just pointlessly using system resources and defeating NSURLConnections attempts to manage connections optimally. However, it does work so if you are not receiving delegate messages you are doing something wrong. Rather than find an alternative way todo it you should try to get to the bottom of your problem with the runloop.

blocks|key|4880945|text|我正在使用ASIHTTPRequest来做类似的操作。通过以下代码更改downloadAllIcons方法以满足您的需求，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4880946|++[NSThread+detachNewThreadSelector:@selector(downloadAllIcons:)+toTarget:self+withObject:xmlData];

+-(void)+downloadAllIcons:(NSData+*)_xmlData
+{

+NSAutoreleasePool+*pool+=+[[NSAutoreleasePool+alloc]+init];
++NSArray+*IconList=+PerformXMLXPathQuery(_xmlData,@"//icon");
+[[NSUserDefaults+standardUserDefaults]+setObject:IconList+forKey:@"IconList"];


+for+(int+i=0;+i<[IconList+count];+i%2B%2B)+{

++++if+([[NSUserDefaults+standardUserDefaults]+objectForKey:[[IconList+objectAtIndex:i]+objectForKey:@"nodeContent"]]==nil)+{
++++++++NSData+*+responseData=[self+downloadProccessedImage:[[IconList+objectAtIndex:i]+objectForKey:@"nodeContent"]];


++++++++if(responseData)
++++++++++++[[NSUserDefaults+standardUserDefaults]+setObject:responseData+forKey:[[IconList+objectAtIndex:i]+objectForKey:@"nodeContent"]];
++++++++//NSLog(@"%25@",[[IconList+objectAtIndex:i]+objectForKey:@"nodeContent"]);
++++}



}
[pool+release];



+}


+-(id)+downloadProccessedImage:(NSString+*)_URL
++{


NSData+*response=nil;
NSURL+*url+=+[NSURL+URLWithString:_URL];
ASIHTTPRequest+*request+=+[ASIHTTPRequest+requestWithURL:url];
[request+setTimeOutSeconds:60];
[ASIHTTPRequest+setShouldThrottleBandwidthForWWAN:YES];
[request+startSynchronous];
NSError+*error+=+[request+error];
if+(!error)
{
++++response+=+[request+responseData];
}+++++++
return+response;

++++}|code-block|syntax|javascript|4880947|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I'm using ASIHTTPRequest to do the similar operation. Go through the following code change the downloadAllIcons method to suit your requirement,

<pre><code> [NSThread detachNewThreadSelector:@selector(downloadAllIcons:) toTarget:self withObject:xmlData];

 -(void) downloadAllIcons:(NSData *)_xmlData
 {

 NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
 NSArray *IconList= PerformXMLXPathQuery(_xmlData,@"//icon");
 [[NSUserDefaults standardUserDefaults] setObject:IconList forKey:@"IconList"];


 for (int i=0; i&lt;[IconList count]; i++) {

 if ([[NSUserDefaults standardUserDefaults] objectForKey:[[IconList objectAtIndex:i] objectForKey:@"nodeContent"]]==nil) {
 NSData * responseData=[self downloadProccessedImage:[[IconList objectAtIndex:i] objectForKey:@"nodeContent"]];


 if(responseData)
 [[NSUserDefaults standardUserDefaults] setObject:responseData forKey:[[IconList objectAtIndex:i] objectForKey:@"nodeContent"]];
 //NSLog(@"%@",[[IconList objectAtIndex:i] objectForKey:@"nodeContent"]);
 }



}
[pool release];



 }


 -(id) downloadProccessedImage:(NSString *)_URL
 {


NSData *response=nil;
NSURL *url = [NSURL URLWithString:_URL];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setTimeOutSeconds:60];
[ASIHTTPRequest setShouldThrottleBandwidthForWWAN:YES];
[request startSynchronous];
NSError *error = [request error];
if (!error)
{
 response = [request responseData];
} 
return response;

 }
</code></pre>

This may sounds weird but please bear with me. I have 6-7 API calls which make request to a server one by one. I want to implement these calls in a separate thread. But when I do this, none of my delegate methods (of NSURLConnection) gets called even after managing a separate NSRunloop 
 ([[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];)

Can anyone suggests me alternative approach for the same or any correction in existing functionality??

Implement Asynchronous Download (NSURLConnection) on separate NSThread?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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这可能听起来很奇怪，但请耐心听我说。我有6-7个API调用，一个接一个地向服务器发出请求。我想在一个单独的线程中实现这些调用。但是当我这样做时，我的委托方法(NSURLConnection的)都不会被调用，即使在管理了一个单独的NSRunloop之后([NSRunLoop currentRunLoop runMode:NSDefaultRunLoopMode beforeDate:NSDate ]

问在单独的NSThread上实现异步下载(NSURLConnection)？
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