How to save a png image to camera roll?

I'd like to save screenshots from my game to camera roll. Right now I'm using UIImageWriteToSavedPhotosAlbum which saves 开发者_开发百科the image in jpg format with way too much ugly jpg artifacts. Is there a way to save an UIImage in png format to camera roll?

First you have to add AssetsLibrary Framework, than like this:

ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

UIImage *image = ... some image

[library writeImageDataToSavedPhotosAlbum: UIImagePNGRepresentation(image) metadata:nil completionBlock:nil];

The solution pointed out here is now deprecated - this post:

UIImageWriteToSavedPhotosAlbum saves to wrong size and quality

shows how to do this:

UIImage* im = [UIImage imageWithCGImage:myCGRef]; // make image from CGRef
NSData* imdata =  UIImagePNGRepresentation ( im ); // get PNG representation
UIImage* im2 = [UIImage imageWithData:imdata]; // wrap UIImage around PNG representation
UIImageWriteToSavedPhotosAlbum(im2, nil, nil, nil); // save to photo album

Napolit "I'd like to save screenshots from my game to camera roll. Right now I'm using UIImageWriteToSavedPhotosAlbum which saves the image in jpg format with way too much...."

Have just stumbled across your question, most of which I can't answer. however, I do have an EASY & QUICK WAY to grab iPad screens. Simply press the SLEEP/WAKE button and the HOME (round button at bottom of the screen) button at the same time.

This tells how to represent a UIImage as a jpg or png: Save UIImage Object as PNG or JPEG File