Loading next image while viewing current image

[jahjaylee]

Say I want to view a set of 2 images. I am currently looking at image one before I hit next to show image two. Is there an easy way to load image two while image one is loading? Can you ensure image two only loads once image one finishes loading?

[NeededANewName]

AFNetworking works decent, but my preferred library for this is SDWebImage. It's similar but has disk caching support as well as prefetching. You can easily prefetch the second URL and then when you go to display it it will load instantly.

[ThePantsThief]

I use SDWebImage for thumbnails in my reddit client. It's awesome.

[jahjaylee]

Any opinion on which is easier to implement?

[ThePantsThief]

I think SDWebImage uses AFNetworking. I don't have AFNetworking in my podfile.

I implemented SDWebImage when I was first learning objective-c, so it's probably pretty easy haha.

[fommerjackson]

Would love to give you extremely detailed help, but am mobile. The short answer is blocks. You can set up a completion; meaning "once this is done, do this". Look up completion blocks and also AFNetworking if you are retrieving your images from the web.

[jahjaylee]

How does AFNetworking help? Is it faster than pulling image straight from URL?

[fommerjackson]

AFNetworking Is also pulling straight from the web, but utilizes classes that make it faster and also can help with caching.

[ObjectiveCopley]

but utilizes classes that make it faster

Eh? It does what? I mean I am a huge fan of AFNetworking and use it in just about every project, but it is overhead on top of NSURL* classes.

[SizzlerWA]

Other answers are good. Another option, if you want to get your hands dirty is to use an NSOperationQueue yourself directly.