Re: how to cache images
Re: how to cache images
- Subject: Re: how to cache images
- From: Jens Alfke <email@hidden>
- Date: Sat, 08 Jun 2013 12:05:10 -0700
On Jun 8, 2013, at 8:01 AM, Ken Thomases <email@hidden> wrote:
> Alternatively, you could force the image to load and then use +[NSBitmapImageRep representationOfImageRepsInArray:usingType:properties:] to create an NSData from the image's representations and save that to file.
Not a good idea. If you do this with images that were originally JPEG, you’ll degrade the image quality if you save it out as JPEG again, since it’ll have to run the pixels through the lossy encoder again. Or if you save it in a different format the file size will go up a lot.
> Another approach would be to use NSURLConnection to obtain the image data.
Or -[NSData dataWithContentsOfURL:options:error:] if you want the short-and-easy form. I wouldn’t recommend this in a real app, though, because it blocks while loading the file.
—Jens
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