Swift - Parse Check if PFFile is cached

Question

Considering I'm using PFImageViews, with caching enabled, I would like to know if there's a way to determine whether an image has already been downloaded or not.

All in all, I want to say:

if imageAlreadyDownloaded {
    ...
}
else {
    ...
}

Is it possible?

Answer 1

I think you will have to roll your own solution using the PFImageView and the loadInBackground method that has a completion handler.

Something like:

// Instance property on your UIViewController
private var imageAlreadyDownloaded = false

// Somewhere else in your UIViewController...
imageView.loadInBackground() { 
    [unowned self] (image, error) in

    guard error == nil else {
        return
    }
    self.imageAlreadyDownloaded = true
}

Answer 2

So, I finally found the solution to my own problem! Every PFFile, has a boolean property called "isDataAvailable".

With a bit of code we can have the following solution:

let imageFile = file as? PFFile

if imageFile.isDataAvailable {
    ...
}
else {
    ...
}

And done! ;-)