Toytoy Googie's Geeky blog

Just read this very helpful article on implementing a singleton in iOS. Below is a simple snippet that is thread safe, and is indeed, faster than @synchorize when is executed. +(MyClass *)singleton { static dispatch_once_t pred; static MyClass *shared = nil; dispatch_once(&pred, ^{ shared = [[MyClass alloc] init]; }); return shared; } dispatch_once() function is indeed mentioned in Mac Developer Library that is useful in implementing singletons or global data. Hope you found this helpful.

To create a 2 bits per pixel of PVR file as a mipmap, then issue this command /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/texturetool -e PVRTC --bits-per-pixel-2 -f PVR -o Brick_2.pvr test.png To create a 4 bit, just use  --bits-per-pixel-4 instead of --bits-per-pixel-2. Brick_2.pvr is the output of the file, then test.png is your file that is height and width of your image file are equivalent in numbers of pixels.  If not a mipmap file, then just remove the -m like, /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/texturetool -e PVRTC --bits-per-pixel-2 -f PVR -o Brick_2.pvr test.png  Hope this helps.