Abstract classes in Swift Language
There are no abstract classes in Swift (just like Objective-C). Your best bet is going to be to use a Protocol, which is like a Java Interface. With Swift 2.0, you can then add method implementations and calculated property implementations using protocol extensions. Your only restrictions are that you can't provide member variables or constants and there is no dynamic dispatch. An example of this
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How can I create a function with a variable number of arguments?
How would I implement a swipe-based circular control like this?