How to get values for A and B in dictionary [A : B] while iterating through a For loop?

Thanks for the reply, Brian. That looks good, but there is another thing---when using Parse (which I'm doing), I have to call this method (getDataInBackgroundWithBlock)... Do I separate the two PFFiles using the syntax you mentioned above, then call getData(...) on each, then put them back into a dictionary as UIImages? This big problem is: I only know how to populate a CollectionView from an array... How do I populate a CollectionView from a dictionary? With the thumb index the same as the full-size index, how do I pass the full-size to the destinationViewController? (It's all a bit complicated).

Edit: I tried the syntax you mentioned, but it seems to only do one iteration. I have three objects in the images Dictionary, but when I run them through the "for in" you mentioned, only one object is put into the new Dictionary.

Example: I have ["A" : "B", "C" : "D", "E" : "F"], and when I use your for-in (converting the PFFiles to UIImages...) and then count my new dictionary, all I have is ["AImage", "BImage"]. Thus, it seems... Ah, wait... Here might be an issue: I use the for (image, thumbnail) in imageDict ... then I have two separate {do stuff} {do stuff} parts, for the getDataInBackgroundWithBlock (one for image, one for thumbnail), then, below their enclosures, I use parseImageDictionary.updateValue(imageParse, forKey: thumbParse)... but I'm thinking here's a problem. If the .updateValue only is called once (when the two {do stuff} {do stuff}s are done), that could be why only one object is showing up in the dictionary. Do you see the complex problem here? I need the two images together, but I need to separate them to getData out of them... I don't think Parse has a getData for dictionary PFFiles... Right? Or do they? That would make it simpler.

To reiterate: I have a Dictionary of PFFiles, I need to get the UIImages from them, but they need to return to Dictionary because they need to have same index, so I can use them in a thumbnail / full size CollectionView situation.

The mind-blowing thing is... THIS MUST BE A COMMON BIT OF CODE! The internet lets me down sometimes. This must be a super common situation. You need thumbnails because they fit better in little boxes that you click with your thumbs. But you need the full-size too, because they look better. But as arrays, the two will never line up (un-ordered), so you can't use their indexes.

Any idea what's up? Thanks.

I've been messing with this a while now, and I'm second guessing using a Dictionary for this. How do you get two images out of a Dictionary?

[Key: Image, Value: ThumbnailImage] ... I need both, not just one.