Objective-C Blocks are very powerful but often under-used or badly abused! Continuing on from my previous post on how to declare a block, here is a quick-fire list of 5 experience-earned tips that every developer should know.
Are you really sure on how to declare a block? How about all 4 variations? On iOS and macOS, it can be easy to forget Objective-C block syntax as it isn’t the most intuitive, especially now Swift is becoming the main language of new projects. Remembering the syntax is actually just a short click away but here are easy-to-read example uses with nullability tips and things to watch out for when declaring a block.
AES stands for Advanced Encryption Standard and is an industry-standard algorithm for encrypting data symmetrically which even the US government has approved for SECRET documents. If you don’t know what symmetrical encryption is, it means that you use the same key or password to encrypt the data as you do to unencrypt it. So you need to keep the key extremely secret however it’s still incredibly useful. I’ll show you how to use openssl to encrypt some data and decrypt it using the Common Crypto libraries on iOS.
I’ve just finished developing Yeti Escape for Vivid Reflection, my iOS development company. Yeti Escape is a new Christmas-themed retro game for iOS. The story: Present-hungry yetis have escaped from the North Pole and threaten to ruin Christmas. Pixel Santa must save the day by throwing spare presents at them. Can he still make his deliveries on-time? The game is available now on the App Store and I’ve made a short 2 minute video demoing the retro gameplay and awesome 8-bit sound effects and music so please check it out.
The Yeti Escape game is made in Cocos2D and has Game Center leader board support so you can challenge your friends too. It’s a fun variation on the classic 8-bit arcade shooter. You play by tapping the screen to fire presents from your sleigh, aiming to hit the yetis. Once they consume a present they disappear back to their slumber in the North Pole. If they escape, they eat everyone’s presents and it’s game over. In some ways it plays a bit like a modern-themed twist on the arcade classic Missile Command. As Pixel Santa is moving through the game world, you have time and aim the shot just right to hit the moving yeti. There are a number of different yetis all of differing strengths and speeds which try to escape at different times and if you’re not expecting it you’ll find yourself shrieking as some “super powerful bad-ass” sumo yeti escapes with your last life.
Please let me know what you think about the game in the comments. What’s your best bit about 8-bit retro games?
If you’d like to keep up-to-date on the apps and games I develop, follow @VReflection on Twitter or like Vivid Reflection’s Facebook page. The game has just gone live and Yeti Escape can be downloaded on the App Store now.