开发一款可让您从列表中下载播客的应用程序(在tableview中)。 我使用ASINetworkQueue允许多个同时下载。 下载发生在另一个类(tabbar应用程序中的另一个viewcontroller) 并且通过调用“addRequest:(url)”
通知此类我面临的问题是我正在创建一个新队列,如果ASINetworkQueue为nil,我正在添加一个新请求,(仅在第一个上调用[queue go])
但是,我的第一个请求永远不会开始。我在“requestDidStart”中有一个NSLog,我发现这不会被调用。
我的第二个请求,一切正常,但第一个仍然没有开始下载。
我的代码如下:
-(void)downloadFile:(NSMutableDictionary*)objectDetails fromFeed:(NSString*)feedTitle;
{
NSMutableDictionary *fileData = [objectDetails mutableCopy];
[fileData setObject:feedTitle forKey:@"fromFeed"];
if(networkQueue==nil)
{
NSLog(@"------------------>Network queue was NIL. Creating...<------------------");
self.networkQueue = [ASINetworkQueue queue];
[self.networkQueue setDelegate:self];
[self.networkQueue setRequestDidFinishSelector:@selector(requestFinished:)];
[self.networkQueue setRequestDidStartSelector:@selector(requestDidStart:)];
[self.networkQueue setRequestDidFailSelector:@selector(requestFailed:)];
[self.networkQueue setQueueDidFinishSelector:@selector(queueFinished:)];
}
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:[objectDetails objectForKey:@"audio"]]];
if (request == nil) {
NSLog(@"There was an error downloading the file");
return;
}
[request setShouldContinueWhenAppEntersBackground:YES];
[request setDelegate:self];
//Find pathname for file.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder
NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"Downloads"];
//If Downloads folder doesnt exist, create it.
NSError *error;
if (![[NSFileManager defaultManager] fileExistsAtPath:dataPath])
[[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:NO attributes:nil error:&error];
NSMutableString *filepath = [NSString stringWithFormat:@"%@/%@",
dataPath,[[objectDetails objectForKey:@"audio"] lastPathComponent]];
if([filepath pathExtension] == @"")
{
NSLog(@"extension did not exist. assuming MP3");
[filepath appendString:@".mp3"];
}
NSLog(@"Will attempt to download to \n%@",filepath);
[request setDownloadDestinationPath:filepath];
[request setShowAccurateProgress:YES];
[networkQueue setShowAccurateProgress:YES];
[request setDownloadProgressDelegate:self];
[fileData setObject:request forKey:@"request"];
[fileData setObject:[NSNumber numberWithLongLong:0.0] forKey:@"completed"];
//Add this to array that keeps track of downloads
if(!pendingDownloadsArray)
{
pendingDownloadsArray = [[NSMutableArray alloc] init];
}
[pendingDownloadsArray addObject:fileData];
[fileData release];
[networkQueue addOperation:request];
//Add the request to the queue and start.
if ([networkQueue requestsCount]==1 ) {
NSLog(@"------------------>>Only 1 request. Starting queue with %d objects<------------------",[networkQueue requestsCount]);
[networkQueue go];
}
}
答案 0 :(得分:0)
您不需要检查requestcount
只需使用“networkqueue go”即可。