I'm trying to create a function as an extension of UIImageView that loads non-progressive image progressively, using PinRemoteImage. The URL passed to the function provides a progressive PNG image, which seems unable to load progressively even with self.pin_updateWithProgress option being true.
I changed the server's implementation so that the server returns low resolution image when /128 is added to the end of the image's URL.
Then I'm trying to first load that low resolution image ("/128" one) into a UIImageView, followed by another pin_setImage which loads the final high resolution image to the UIImageView, using the low resolution image as placeHolder.
The code looks like the following:
func setProgressively(url: URL, completion: @escaping (Bool) -> Void) {
guard let url128 = URL(string: "\(url.absoluteString)/128") else { return }
self.pin_setImage(from: url128) { [weak self] (result) in
self?.clear()
self?.pin_setImage(from: url, placeholderImage: result.image, completion: { [weak self] (finalresult) in
PINRemoteImageManager.shared().cache.removeObject(forKey: PINRemoteImageManager.shared().cacheKey(for: url128, processorKey: nil))
self?.pin_updateUI(with: finalresult)
})
completion(true)
}
}
func clear() {
pin_cancelImageDownload()
pin_clearImages()
}
However, the UIImageView doesn't update from the low resolution image, or it only loads the high resolution image for some occasions.
Has anybody tried the similar implementation and knows a better practice?
