CODEWITHSUNDEEP
iosswift
Marcos
Marcos

Reputation: 169

Create a variable of type UIView that conforms a protocol in swift

Inside a class, I want to add a variable of type UIView, which conforms to the following protocol:

public protocol Shadow: UIView {
    func applyShadow()
}

public extension Shadow {
    func applyShadow() {
        self.layer.cornerRadius = 16
        ...
    }
}

To then be able to do something like this :

private lazy var shadowView: Shadow = UIView()
shadowView.applyShadow()

I want to do this, so I don't have to bring that function applyShadow() to my class and have repeated code.

Upvotes: 0

Views: 436

Answers (1)

Tran To
Tran To

Reputation: 295

Basically, there are 2 ways to do this. One is having a protocol Shadow then creating a concrete class to conform to Shadow protocol as below

public protocol Shadow: UIView {
    func applyShadow()
}

public extension Shadow {
    func applyShadow() {
        self.layer.cornerRadius = 16
    }
}

// re-use Shadow protocol 
//this is a concrete class that conforms to Shadow protocol 
class Title: UIView, Shadow {}


class Card: UIView {
   private lazy var oneVariable: Title = {
        let view = Title()
        view.applyShadow()
        return view
    }()
}

Or you can create an extension of UIView in Shadow class

class Shadow: UIView {}

extension UIView {
    func applyShadow() {
        self.layer.cornerRadius = 16
    }
}

Upvotes: 2

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