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POLoad images in to a ScrollView
 

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    <p>Hi have a problem with that load images (1024x1024) cached on disk to a UIScrollView takes a while (just a lagg but annoing) to load into memory. when a use images with size 668px × 445px the lagg is acceptable. I have tried to Load the data using threads same result when I use dispatch_async</p> <p>Any ide how to improve preformance on loading data async?</p> <pre><code>-(void)setupImageView:(BMPhoto *)_photo { methodStart = [[NSDate date] retain]; if ([[photo imageUrl] isEqualToString:[_photo imageUrl]]) return; photo = _photo; [imageView removeFromSuperview]; [imageView release]; imageView = nil; self.zoomScale = 1.0; BMCache *cache = [BMCache sharedCache]; if ([cache isFileCached:[photo imageUrl]]) { [NSThread detachNewThreadSelector:@selector(loadImageFromCache:) toTarget:self withObject:[photo imageUrl]]; } else { [NSThread detachNewThreadSelector:@selector(loadImageFrom:) toTarget:self withObject:[photo imageUrl]]; } } -(void)loadImageFromCache:(NSString *)url{ NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; UIImage *image = [UIImage imageWithData:[[BMCache sharedCache] getCachedRemoteFile:url]]; [self performSelectorOnMainThread:@selector(displayImage:) withObject:image waitUntilDone:NO]; [pool release]; } -(void)loadImageFrom:(NSString *)url{ NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; NSData* imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[photo imageUrl]]]; [[BMCache sharedCache] addRemoteFileToCache:url withData:imageData]; UIImage* image = [[[UIImage alloc] initWithData:imageData] autorelease]; [imageData release]; [self performSelectorOnMainThread:@selector(displayImage:) withObject:image waitUntilDone:NO]; [pool release]; } - (void)displayImage:(UIImage *)image { NSDate *methodFinish1 = [NSDate date]; NSTimeInterval executionTime1 = [methodFinish1 timeIntervalSinceDate:methodStart]; NSLog(@"Thread Done time: %f", executionTime1); if (image) { //imageView.image = nil; imageView = [[BMPhotoViewImageView alloc] initWithImage:image]; [self addSubview:imageView]; self.contentSize = [image size]; [self setMaxMinZoomScalesForCurrentBounds]; self.zoomScale = self.minimumZoomScale; NSTimeInterval executionTime2 = [[NSDate date] timeIntervalSinceDate:methodFinish1]; NSLog(@"Load image time time: %f", executionTime2); NSDate *methodFinish = [NSDate date]; NSTimeInterval executionTime = [methodFinish timeIntervalSinceDate:methodStart]; NSLog(@"Total time: %f", executionTime); NSLog(@"-------------------------------------------"); } } </code></pre> <p>Thread Done time: 0.015229 Load image time time: 0.009824</p> <h2>Total time: 0.028263</h2> <p>Thread Done time: 0.025037 Load image time time: 0.005314</p> <h2>Total time: 0.035781</h2> <p>Thread Done time: 0.026063 Load image time time: 0.004379</p> <h2>Total time: 0.033177</h2>
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    1. USFoJjen
    1. USFoJjen
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    1. COI suggest you to load image in image view and that imageview to scrollView, it works faster.
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      1. POLoad images in to a ScrollView
      1. USrptwsthi
    2. COTryed to alloc imageView in init och just set the image in display image with no difference same lagg
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      1. POLoad images in to a ScrollView
      1. USFoJjen
 

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