UIProgressBar动画不平滑

Question

我有一个在HTML Parsing for循环中更新的UIProgressBar。但它的更新并不顺利。我希望它显示出平稳的增长。我试着把async_dispatch放进去，但是它根本没有更新。下面是我的代码：

- (void)viewDidLoad
{
    [super viewDidLoad];

    [self performSelectorOnMainThread:@selector(getWeeklyProgram) withObject:nil waitUntilDone:NO];
}

-(void)getWeeklyProgram 
{
   NSURL *programURL = [NSURL URLWithString:@"http://www.mostlifeclub.com/studyo-programlari/"];
   NSData *programHtmlData = [NSData dataWithContentsOfURL:programURL];

   TFHpple *programHTMLParser = [TFHpple hppleWithHTMLData:programHtmlData];
   NSString *activitiewXpathQueryString = @"//div[@class='wpb_row vc_row-fluid prk_full_width prk_section parallaxed']/div[@class='prk_inner_block columns centered']/div[@class='vc_span12 wpb_column column_container']/div[@class='wpb_wrapper']/div[@class='wpb_tabs wpb_content_element']//div[@class='wpb_wrapper wpb_tour_tabs_wrapper ui-tabs vc_clearfix']/div[@class='wpb_tab ui-tabs-panel wpb_ui-tabs-hide vc_clearfix']";
   NSArray *activityNodes = [programHTMLParser searchWithXPathQuery:activitiewXpathQueryString];
   NSMutableArray *activities = [[NSMutableArray alloc] init];

   //for each node
   for (TFHppleElement *element in activityNodes)
   {
        currentProgressCount += 1;

        @try
        {
            //Here I want to increase ProgressBar
            [self increaseProgress:currentProgressCount :activityNodes.count];

            }
         @catch(NSException* ex)
         {

         }
    }
}


-(void)increaseProgress:(int)currentLine:(int)totalLines {

    progressView.progress = (CGFloat)currentLine / (CGFloat)totalLines;
    if(progressView.progress >= 1.0f)
    {
        NSLog(@"bitti");
    }
}

Answer 1

在另一个线程中运行For循环和时间密集型内容，并在主线程中更新UI：

dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
   // Time Intensive Code
   dispatch_sync(dispatch_get_main_queue(), ^{
       // Update UI
   });
});

您可能需要将dispatch_sync...放在for循环中以更新UI