Here is situation in your Xcode project that you want to call method from another class swift file to your original class of swift file.
Let’s call your original swift class file ‘FirstViewController’ which has ‘UIViewController’ as super class.
Second swift that you want to call function from we will assume that it has ‘SecondViewController’ as class name & it has ‘UIViewController’ as super class.
You have written function called ‘printSomething()’ in your ‘SecondViewController’ that would be triggered when somebody taps on button present on ‘FirstViewController’ as IBAction called ‘printThis(sender: UIButton)’
So you will write printThis function as follows:
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