effective UI styling for iOS app [closed]

Question

My question is a simple one. In android, we can separate xml stylesheet from layout so that it can be reuse everywhere and edited easily for UI design change.

Is it also possible in iOS xcode? if can how (prefer if not from controller)? need libraries? what are good libraries for that?

Thank you for your answer.

Answer 1

You could create your own styles using enums. By placing enums inside the Styles enum you get a nice grouping:

enum Styles {
    enum Labels {
        case Standard
        case LargeText

        func style(label: UILabel) {
            switch self {
            case .Standard:
                label.font = UIFont.systemFontOfSize(12)
            case .LargeText:
                label.font = UIFont.systemFontOfSize(18)
            }
        }
    }

    enum Buttons {
        case RedButton

        func style(button: UIButton) {
            switch self {
            case .RedButton:
                button.setTitleColor(UIColor.redColor(), forState: UIControlState.Normal)
            }
        }
    }
}

Then you can use it like this:

Styles.Labels.Standard.style(yourLabel)

You can also then make extensions for the styles you have setup:

extension UILabel {
    func style(style: Styles.Labels) {
        style.style(self)
    }
}

extension UIButton {
    func style(style: Styles.Buttons) {
        style.style(self)
    }
}

And then use the extensions like this:

yourLabel.style(.Standard)
yourButton.style(.RedButton)