如何在Swift中的不同文件中为类定义函数？

Question

I have a swift class that has about 10 different functions in it. It's over 400 lines of code and needs to be broken up. I want to put some functions in different files. What is the best way to do this? Maybe inheritance?

Answer 1

You can create different files and then put some method in there within extension .

Example:

class MyMessyViewController: UIViewController {
    var oneVariable: String = ""
    override func viewDidLoad() {
       super.viewDidLoad()
       anotherFunctionFromThisExtension()
    }

    func one(){
    }
    func two(){
    }
    func three(){
    }
} 

Then Create a new file and put more functions into this file within an extension.

extension MyMessyViewController {

    func anotherFunctionFromThisExtension() {
       oneVariable = "I made this change from this File"
       print(oneVariable)
    }
}

Best practice if you have Delegates, Collection/TableViews in you view controller, you can separate them with extensions, just instead of simple extension MyMessyViewController { } write like extension MyMessyViewController: UICollectionViewDelegate, UICollectionViewDataSource { }