iOS Swift Tips for Loading Image Faster

Question

I have PNG images that range from 2MB to 12MB in size. I'm loading one of these images into an imageView using SDWebImage via the following code in my viewDidLoad:

self.imageView.contentMode = UIViewContentMode.ScaleAspectFit
self.imageView.sd_setImageWithURL(NSURL(string: imageURL))

It can take as high as 17 seconds to load this image onto the view. Am I doing something wrong here? I'm only loading one of these images into my view, so I did not think it would take this long. Any other things I can do to load the image faster?

Is the only option creating a smaller image to load?

Answer 1

If you are trying to download a thumbnail image from the back-end you can try adding the context parameter in your SDWebImage call.

yourImageView.sd_setImageWithURL(withPlaceholder: nil, context: [.imageThumbnailPixelSize: yourThumbnailSize])

Add some constant image thumbnail pixel size as shown above.