Iphone – How to save a png image to camera roll

iphoneuiimage

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 ugly jpg artifacts.
Is there a way to save an UIImage in png format to camera roll?

Best Answer

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];

Related Solutions

Objective-c – jpg or png for UIImage — which is more efficient

I am getting the odd crash, presumably due to out of memory

Then STOP WHAT YOU ARE DOING RIGHT NOW and first figure out if that's actually the cause of the crash. Otherwise there's a very good chance that you're chasing the wrong problem here, fixing a memory problem that doesn't exist while ignoring the real cause of the crash. If you want to fix a crash, start by figuring out what caused the crash. Following up on what's "presumably" the problem is a recipe for wasted time and effort.

Iphone – UIImageWriteToSavedPhotosAlbum save as PNG with transparency

As pointed out on this SO question there is a simple way to save pngs in your Photo Albums:

UIImage* image = ...;                                     // produce your image
NSData* imageData =  UIImagePNGRepresentation(image);     // get png representation
UIImage* pngImage = [UIImage imageWithData:imageData];    // rewrap
UIImageWriteToSavedPhotosAlbum(pngImage, nil, nil, nil);  // save to photo album

Best Answer

Related Solutions

Objective-c – jpg or png for UIImage — which is more efficient

Iphone – UIImageWriteToSavedPhotosAlbum save as PNG with transparency

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