Whilst I was doing some work with images recently I was in desperate need for some sample images which were tagged with the EXIF orientation flag for each of the 8 orientations which are supported by UIImage in its UIImageOrientation metadata. I couldn’t find any already out there, so I made my own. And now I’m posting them here for anyone who might also find this useful. I now have these saved on my iPhone and use them in apps as test images.
UIImageOrientation / EXIF orientation sample images
January 30th, 2012How to visualise affine transforms when drawing with Quartz 2D.
January 30th, 2012I had been struggling with some code that I had to rotate an image whilst drawing it so I decided to sit down and work out a nice way to visualise it as I hadn’t seen anything out there really that explained it very well. This is what I came up with…
A look under ARC’s hood – Episode 2
January 7th, 2012Following on from my first post about looking at how ARC works under the hood I thought I would share another little snippet that I found interesting. This time I was wondering what happened when you pulled an object out of an array and returned it from a method. Pre-ARC, you would retain the object then return it autoreleased. With ARC we can get rid of those memory management calls but it just feels wrong. So I decided to check ARC was doing the right thing.
A look under ARC’s hood – Episode 1
January 4th, 2012After a conversation on Twitter with @jacobrelkin I decided to write a little post about how ARC works under the hood and how you can go about seeing what it’s doing. In this post I’ll explain about how ARC adds in retain, release and autorelease calls accordingly.
