Learn how to remove the previous card from your phone.Make sure the phone is switched off. 1. At the top corner of your phone, put the nail of your index finger in the seam between the screenframe and the back cover. Press the middle of the back cover, and bend the cover to loosen the tophooks.
While the Objective-C traditionally had no garbage collection, with the release of OS X 10.5 in 2007 Apple introduced garbage collection for Objective-C 2.0, using an in-house developed runtime collector.
Differences from Objective-C include: 1  Statements do not need to end with semicolons (;), though these must be used to allow more than one statement on a line. 2  No header files. 3  Uses type inference. 4  Generic programming. 5  Functions are first-class objects. 6  Enumeration cases can have associated data (algebraic data types).