Question

我正在使用ASIHTTPRequest将文件本地下载到iDevice。

我的下载代码如下

ASIHTTPRequest *download = [ASIHTTPRequest requestWithURL: videoUrl];
[download setCompletionBlock:^{            
    NSLog(@"Download Success");        
    // other code
}];
[download setFailedBlock:^{            
    NSLog(@"Download Failed");
    // other code
}];
[download setDownloadProgressDelegate: [item progressDelegate]];
[download startAsynchronous];
NSLog(@"Start Download of %@", [item name]);

对象item包含对UIProgressView的引用它在屏幕上显示但从未更新过。

在尝试调试时，我将UIProgressView子类化，并添加了以下日志

- (void)setProgress:(float)newProgress {        
  NSLog(@"Current Progress : %f", newProgress);
  [super setProgress: newProgress];
}

我的控制台现在显示在50次迭代中从0.0到1.0的进度（很好！）但是uiProgressView没有改变，最后NSLog显示0.5进度视图的默认设置。

任何人都知道发生了什么事？

EDIT 使用此

访问UIProgressView

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
   UITableViewCell *cell = [tableView cellForRowAtIndexPath: indexPath];
   id progressView = [cell viewWithTag:VideoDetailProgressView];
   [VideoDownloadManager queueDownloadOfVideo:video progressDelegate: progressView];
}

我已经介入并观察它似乎始终保持对UIProgressView的正确引用

编辑 TableView方法

 // Row display. Implementers should *always* try to reuse cells by setting each cell's reuseIdentifier and querying for available reusable cells with dequeueReusableCellWithIdentifier:
 // Cell gets various attributes set automatically based on table (separators) and data source (accessory views, editing controls)
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *detailCellIdentifier = @"VideoDetailCell";
static NSString *categoryCellIdentifier = @"VideoCategoryCell";
UITableViewCell *cell = nil;
bool isCategorical = [[self.videoList objectAtIndex: indexPath.row] objectForKey:@"parentName"];


if(isCategorical)
{
    cell = [tableView dequeueReusableCellWithIdentifier:categoryCellIdentifier];
}
else
{
    cell = [tableView dequeueReusableCellWithIdentifier:detailCellIdentifier];
}

if (cell == nil && !isCategorical) {
    [[NSBundle mainBundle] loadNibNamed:@"VideoDetailCell" owner:self options:nil];
    cell = self.videoDetailCell;


    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(5.0, 10.0, 46.0, 46.0)];
    [cell addSubview:imageView];
    imageView.hidden = !self.canEdit;
    imageView.tag = VideoDetailsFavoriteButton;
    [imageView release];        


    self.videoDetailCell = nil;
}
else if(cell == nil && isCategorical)
{
    //Different cell
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:categoryCellIdentifier] autorelease];
}
[cell setBackgroundColor:[UIColor clearColor]];
return cell;
}



// Display customization
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
NSDictionary *object = [self.videoList objectAtIndex:indexPath.row];
bool isCategorical = [[self.videoList objectAtIndex: indexPath.row] objectForKey:@"parentName"];

if(isCategorical) {
    cell.textLabel.textColor = [UIColor whiteColor];
    cell.textLabel.text = [object objectForKey:@"name"];

    NSUInteger videoCount = [[Videos sharedVideos] countById: [object objectForKey:@"name"]];
    cell.detailTextLabel.textColor = [UIColor whiteColor];
    cell.detailTextLabel.text = [NSString stringWithFormat: @"%d videos", videoCount];
}
else
{
    [[cell viewWithTag:VideoDetailCellTitle] setValue:[object objectForKey:@"name"] forKey:@"text"];
    [[cell viewWithTag:VideoDetailCellSubtitle] setValue:[object objectForKey:@"dateAdded"] forKey:@"text"];
    [[cell viewWithTag:VideoDetailCellDuration] setValue:[object objectForKey:@"duration"] forKey:@"text"];

    UIHTTPImageView *asyncImage = (UIHTTPImageView *)[cell viewWithTag:VideoDetailCellImage];
    NSURL *thumbUrl = [NSURL URLWithString:[NSString stringWithFormat: @"%@%@", kRootUrlPath, [object objectForKey:@"image"]]];
    [asyncImage setImageWithURL:thumbUrl placeholderImage: [UIImage imageNamed: kLoadingImage]];
    asyncImage.clipsToBounds = YES;

    UIImageView *editButton = (UIImageView *)[cell viewWithTag:VideoDetailsFavoriteButton];

    if ([VideoDownloadManager isQueued: [object objectForKey: @"name"]]) {
        [[cell viewWithTag:VideoDetailCellSubtitle] setHidden:YES];
        [[cell viewWithTag:VideoDetailProgressView] setHidden:NO];
    } else {
        [[cell viewWithTag:VideoDetailCellSubtitle] setHidden:NO];
        [[cell viewWithTag:VideoDetailProgressView] setHidden:YES];
    }

    if ([VideoDownloadManager isFavorites: [object objectForKey: @"name"]] || [VideoDownloadManager isQueued: [object objectForKey: @"name"]]) {
        editButton.image = [UIImage imageNamed: kFavoritesHighlighted];  
    } else {
        editButton.image = [UIImage imageNamed: kFavoritesEmpty];  
    }

 }
}

Answer 1

您可以检查是否在主线程中进行了更新吗？（如果您使用的是最新版本的ASIHTTPRequest，应该是这种情况）

NSLog(@"Current Progress : %f (main thread=%d)", newProgress, [NSThread isMainThread]);

如果它没有帮助，你能在视图中显示使用UIProgressView的代码吗？

Answer 2

感谢大家的帮助。你们引导我回答。我的单元格未正确分配了reuseIdentifier

这导致了整个问题。

ASIHTTPRequest未更新DownloadProgress代理

2 个答案: