View Code

Question

Created Jul ’20

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Boosts 0

Participants 2

Hello, Devs!

On the last years with my team, were are using Storyboards.

From now on we get started with View Code.

I was writing the and learning the best way to do that and I have some doubts around it.

In particular case I writing something like that (Is not done from while)

import UIKit

Code Block class TopView: UIView {
   
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupTopView()
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    func setupTopView() {
        self.addSubview(contentTopView )
    }
    let contentTopView: UIView = {
        let topView = UIView(frame: CGRect(x: 0, y: 0, width: 80, height: 80))
        topView.backgroundColor = .gray
        topView.layer.cornerRadius = 12
        topView.layer.shadowRadius = 1.0
        topView.layer.shadowOpacity = 0.5
        topView.layer.shadowColor = UIColor.lightGray.cgColor
        topView.layer.shadowOffset = CGSize(width: 0, height: 10) 
        
        return topView
    }()
}

This is the best way to write View Code? Why I should to use () on the final block of the contentToTopView after the }?

Thanks,
Cheers!!!

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Answer 1

Claude31 OP

Jul ’20

Accepted Answer

The () at the end causes the closure to execute and thus to return a view as the result.

If you skip it, you don't get a view, but a clossure that can create a view.

It is like defining a func:

Code Block func aFunc() {
	print("I'm a func")
}
let b = aFunc
print("b is", b)
b()	// you get the print.

You get
b is (Function)
I'm a func

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