Question

In my application, I have got a scrollview, a bigger one with lots of subviews on it, subviews gets added dynamically based on scroll. I try to add subviews (imageviews) dynamically on scroll and when user scrolls then I try to fetch more images asynchronously based on pageSize etc from server and these images gets placed into it’s corresponding imageview..

I have gone through Apple’s WWDC Sessoion 104 as well which appears to be good for offline images.

I also try to resize the images on my scrollview in a ratio, which is fine I believe. The problem is When the number of images increases on the scrollview then application runs out of memory. It must be due to me using the images directly in an imageview instead of using CATiledLayer. But, I am looking for help in displaying async images on scrollview using CATiledLayer.

Many Thanks,

Reno Jones

Answer 1

This in simple words is all I did.. I have already been downloading images async and caching them up on device, then I have added an UIImage (imageObject) property to my current tile class, which holds the image object being downloaded and then implemented the following and did the trick for me. And believe me or not, imageview loading vs CATiledLayer – CATiledLayer is 100x faster and efficient.

+ layerClass
{
    return [CATiledLayer class];
}

- (void)drawRect:(CGRect)rect
{
    [imgObject drawAtPoint:CGPointMake(0,0)];
}

Hope it helps someone else in future. Let me know if I can be of more help.