In earlier versions of the Cocoa toolchain you could also call a method that the compiler, at compile time, couldn’t determine the existence of. While this may sound like a powerful capability, it was more commonly a source of hair-pulling debugging scenarios. Although I had read a few Turi

. When an object is in use by another object it’s retain count goes up; when it is not being used by any objects, its retain count reverts to zero. While this is a simple way to add a slightly transparent shadow on a view, it can result in poor rendering performance. Unfortunately, the rend

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