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Very similar to some of the answers of the topic I've seen. I posted this, just because it has a nested function to calculate the angle, and that the return value only gives positive angles from 0 to 2 * pi... Code: override func drawRect(rect: CGRect...

If iOS had to search through an array of method names, then the efficiency wouldn't be very good--but dictionary/set lookups are very fast, so I imagine there must be a big dictionary/set of method pointers(integers) somewhere in the bowels of iOS. Also...

Thank you very much for your answers guys. 7stud7stud, when you say --"because no iOS class defines a method named gooGooGaGa(_:)"--, does it mean that when sending a message to an AnyObject, ( in the worst case scenario ) the compiler has to somehow...

I entered the code for the "Downloading and displaying the image data" section on pp. 327 - 330, but I now get an error. Comparing to the book and the solution file, it looks like I have everything typed in correctly. Some debug lines suggest Success...

id Compatibility Swift includes an AnyObject type that represents some kind of object.... For example, ... you can assign an object of any class type to a constant or variable of AnyObject type. You can also reassign a variable to an object of a different...