在我的应用程序中,我使用ASINetworkQueue方法下载文件。我有n个按钮,每个按钮点击不同的队列将创建多个请求,并开始异步下载(多次下载)。它工作正常,但我无法跟踪每个队列何时完成。我用了,
[self.myQueue cancelAllOperations];
[self.myQueue setDownloadProgressDelegate:currentProgress];
[self.myQueue setDelegate:self];
[self.myQueue setShowAccurateProgress:YES];
[self.myQueue setRequestDidFinishSelector:@selector(requestFinished:)];
[self.myQueue setQueueDidFinishSelector:@selector(queueComplete:)];
并添加了请求,
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:str]];
[request setDownloadProgressDelegate:currentProgress];
[request setShowAccurateProgress:YES];
[request setDelegate:self];
[request shouldContinueWhenAppEntersBackground];
[request allowResumeForFileDownloads];
[request startAsynchronous];
[self.myQueue addOperation:request];
最后,[self.myQueue go];
而委托方法是
- (void)queueComplete:(ASINetworkQueue *)queue
{
NSLog(@"Queue completed");
}
但最后没有调用它。这里出了什么问题?任何的想法? 而且,如果有多个队列同时执行,我们如何区分最终完成哪个队列?
修改
- (void)download{
UIImageView *image = (UIImageView *)[mainView viewWithTag:selectedTag];
for (UIProgressView *currentProgress in [image subviews]) {
if ([currentProgress isKindOfClass:[UIProgressView class]]) {
NSLog(@"Prog tag: %d",currentProgress.tag);
if(currentProgress)
{
currentProgress.progress = 0.0;
[[self myQueue] cancelAllOperations];
[self setNetworkQueue:[ASINetworkQueue queue]];
[[self myQueue] setDownloadProgressDelegate:currentProgress];
[[self myQueue] setDelegate:self];
[[self myQueue] setShowAccurateProgress:YES];
ASIHTTPRequest *request;
[myQueue setQueueDidFinishSelector:@selector(queueComplete:)];
for (int h = 0; h < [urlArray count]; h++) {
request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:[urlArray objectAtIndex:h]]];
[[self myQueue] addOperation:request];
}
[[self myQueue] go];
}
}
}
}
答案 0 :(得分:1)
在将请求添加到队列之前,您正在启动请求。
[request startAsynchronous];
请求的启动应该只由队列处理。因此,删除该行,应该调用完整的回调。
如果有多个队列,则应保留对每个队列的引用。你可以将它们放在NSMutableArray中。然后在完整的回调中,您可以通过检查阵列中的队列来检查哪个队列已完成。
编辑:
您似乎忘记设置myQueue
iVar,因此它是nil
并忽略了所有方法调用。所以添加:
self.myQueue = [ASINetworkQueue queue];
要在数组中拥有多个队列:
self.queues = [NSMutableArray array] // queues is a retained property
ASINetworkQueue *queue = [ASINetworkQueue queue];
[queues addObject:queue];