[UIProgressView在滚动uitableview时被隐藏

Question

我正在尝试使用asinetworkqueue下载URL列表。下载很好。但是，当我滚动uitableview时，我的uiprogressview被隐藏了。

我的意思是，如果进度显示在第2行中，并且如果滚动它，则进度视图将被隐藏。然后，在完成第2行的下载后，它将在第3行中显示进度视图。

简而言之，当滚动uitableview时，活动的uiprogressview被隐藏。

更新

这里还有一些澄清。当某行（例如第1行）的下载未完成时，现在，如果我滚动表格视图并看到第1行，则即使尚未完成下载，该进度视图也会被隐藏。一旦对第1行的下载完成，它将开始对第2行进行降级，现在显示进度视图。

 - (void)viewDidLoad
    {
        [super viewDidLoad];

        self.view.backgroundColor = [UIColor clearColor];

        self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"bg.jpg"]];

        CGRect tblViewFrame = CGRectMake(7 , 0 , self.view.bounds.size.width - 14, self.view.bounds.size.height - 90);
        self.tblViewDownload = [[[UITableView alloc]initWithFrame:tblViewFrame style:UITableViewStyleGrouped]autorelease];
        self.tblViewDownload.backgroundColor = [UIColor clearColor];
        self.tblViewDownload.showsVerticalScrollIndicator = FALSE;
        self.tblViewDownload.scrollEnabled = YES;
        self.tblViewDownload.delegate = self;
        self.tblViewDownload.dataSource = self;
        [self.view addSubview:self.tblViewDownload];

        index = 0;

        dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
            [self loadArray];
        }); // Do any additional setup after loading the view.
    }



    - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

    {
        // Return the number of sections.
        return 1;
    }


    - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

    {
        // Return the number of rows in the section.
        return [self.myUrlArray count];
    }


    - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:
    (NSIndexPath *)indexPath

    {
        CGFloat rowHeight = 75.0;

        return rowHeight;  
    }

    // Customize the appearance of table view cells.
    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:
    (NSIndexPath *)indexPath

    {
        NSString *CellIdentifier = [NSString stringWithFormat:@"Cell%d", indexPath.row];

        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

        UILabel *lblTitle, *lblAuthor;


        if (cell == nil)
        {
            cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero]autorelease];

            cell.selectionStyle = UITableViewCellSelectionStyleNone;

            lblTitle = [[[UILabel alloc]initWithFrame:CGRectMake(65, 10, 220, 25)]autorelease];
            lblTitle.backgroundColor = [UIColor clearColor];
            //lblTitle.font = [UIFont boldSystemFontOfSize:15.0];
            lblTitle.font = [UIFont fontWithName:@"Palatino-Bold" size:15.0];
            lblTitle.text = @"Sample title";
            [cell.contentView addSubview:lblTitle];

            lblAuthor = [[[UILabel alloc]initWithFrame:CGRectMake(65, 30, 220, 25)]autorelease];
            lblAuthor.backgroundColor = [UIColor clearColor];
            lblAuthor.font = [UIFont italicSystemFontOfSize:13.0];
            lblAuthor.textColor = [UIColor grayColor];
            lblAuthor.text = @"sample authior";
            [cell.contentView addSubview:lblAuthor];



        }

        return cell;
    }


    -(void)loadArray{

      NSString *urk = @"http://sample/iphone/video/video_2.mov";
      self.myUrlArray = [[NSMutableArray alloc]init];

      for( int i = 0;i<10;i++){
        [self.myUrlArray addObject:urk];
      }


      dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
        [self downLoadPoems];
      });

    }

    -(void)downLoadPoems{

        if( index < [myUrlArray count] )
        {
            NSLog(@"this is the index %d",index);

        NSIndexPath *myIP = [NSIndexPath indexPathForRow:index inSection:0];

        UITableViewCell *Cell = [self.tblViewDownload cellForRowAtIndexPath:myIP];

        progress = [[UIProgressView alloc]initWithProgressViewStyle:UIProgressViewStyleBar];
        progress.frame = CGRectMake(65, 55, 210, 25);
        progress.progress = 0.0;
        progress.backgroundColor = [UIColor redColor];
        [Cell.contentView addSubview:progress];
        }


        if(!self.networkQueue)
            self.networkQueue = [[[ASINetworkQueue alloc] init] autorelease];

        [self.networkQueue cancelAllOperations];
        [self.networkQueue setQueueDidFinishSelector:@selector(queueCompleted:)];
        [self.networkQueue setShowAccurateProgress:YES];
        [self.networkQueue setDownloadProgressDelegate:progress];

        [self.networkQueue setDelegate:self];

        if( index < [myUrlArray count] )
        {        
            NSString *url = [myUrlArray objectAtIndex:index];

            NSArray *aPoemArrayUrls = [NSArray arrayWithObjects:url,nil];

            for(NSString* urlString in aPoemArrayUrls)
            {
                NSURL *url = [NSURL URLWithString:urlString];
                ASIHTTPRequest *downloadAFileRequest = [[ASIHTTPRequest requestWithURL:url]retain];
                NSString *Filename = [urlString lastPathComponent];
                NSLog(@"%@ filename",Filename);
                [downloadAFileRequest setUserInfo:[NSDictionary dictionaryWithObject:@"request1" forKey:@"name"]];
                [downloadAFileRequest setDownloadDestinationPath:[[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:Filename]];
                [downloadAFileRequest setShouldContinueWhenAppEntersBackground:YES];
                [downloadAFileRequest setDelegate:self];
                [downloadAFileRequest setDidFinishSelector:@selector(requestDone:)];
                [downloadAFileRequest setDidFailSelector:@selector(requestWentWrong:)];
                [downloadAFileRequest setShowAccurateProgress:YES];

                [self.networkQueue addOperation:downloadAFileRequest];
                //----
            }

            [self.networkQueue go];


        }





    }

    -(void)queueCompleted:(ASINetworkQueue*)queue{

        NSLog(@"queueCompleted");

       self.tblViewDownload.userInteractionEnabled = YES;

        UIProgressView *progressv = (UIProgressView*)queue.downloadProgressDelegate;

        if (progressv)
            [progressv removeFromSuperview];


        if ( index < [myUrlArray count] ){

            index++;

            [self downLoadPoems];
        }

    }


    - (void)requestDone:(ASIHTTPRequest *)request
    {
        NSLog(@"request done");
        NSString *response = [request responseString];
    }

    - (void)requestWentWrong:(ASIHTTPRequest *)request
    {
        NSLog(@"request went wrong");

        NSError *error = [request error];
    }

    - (void)viewDidUnload
    {
        [super viewDidUnload];
        // Release any retained subviews of the main view.
    }

    - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
    {
        return (interfaceOrientation == UIInterfaceOrientationPortrait);
    }

Answer 1

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