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POScrollView addSubview: very slow
 

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  1. POScrollView addSubview: very slow
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    <p>I am using a scrollview to display a viewcontrollers view. if the user reaches the end of the cached views my method reloads the new views. My NSLogs say that the method is finished but it takes additional 5 seconds to display the view. I think that the [scrollView addSubview:vc.view] is very very slow but I found nothing to improve it.</p> <p>the whole method gets called in -(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView </p> <pre><code> scrollView.userInteractionEnabled = NO; UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]; [activityIndicator setFrame:CGRectMake((320.f*index)+135.f, 151, 50, 50)]; [activityIndicator setHidesWhenStopped:YES]; [activityIndicator startAnimating]; [scrollView addSubview:activityIndicator]; MBBAppDelegate *delegate = (MBBAppDelegate *)[UIApplication sharedApplication].delegate; [delegate fetchDealsWithFilter:dealFilter fromIndex:index toIndex:(index+3) onSuccess:^(id object){ MBBDealList *list = object; int i = 0; ProductDetailViewController *vc; for (MBBDeal *deal in [list deals]) { NSLog(@"start %i",i); int indexInArray = i;//[list.deals indexOfObject:deal]; if (indexInArray+index &gt;= numDeals) { return; } vc = [[ProductDetailViewController alloc] init]; //fetch the deal and insert vc.numberOfDeals = numDeals; vc.dealIndex = index+1+indexInArray; vc.dealFilter = dealFilter; vc.deal = deal; vc.view.frame = CGRectMake(320.f*(index+indexInArray), 0.f, 320.f, 436.f); [scrollView addSubview:vc.view]; [productDetailViewControllers insertObject:vc atIndex:(index+indexInArray)]; i++; } [activityIndicator stopAnimating]; scrollView.userInteractionEnabled = YES; }]; } </code></pre> <p>Does anyone know how I can improve my method?</p>
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    1. USbtype
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    1. COWhen you profiled the app with Instruments, where did you find most of the time was being spent during those 5 seconds?
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      1. POScrollView addSubview: very slow
      1. USCaleb
    2. COwhich preset should I use in Instruments? I found nothing helpful.
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      1. POScrollView addSubview: very slow
      1. USbtype
    3. COthis delay is because of data fetch process......
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      1. POScrollView addSubview: very slow
      1. USRajneesh071
 

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