iOS swift UIColor extension

[erdinc27]

i want to extend UIColor. But when i call the method then i get error. Here how i extend

import Foundation
import UIKit

extension UIColor {
   
    func theMainColor() -> UIColor {
       
        return UIColor(red: 224, green: 0, blue: 30, alpha: 1.0)
    }
}

and how i call it

self.view.backgroundColor = UIColor.theMainColor()

but here it wants me to enter a parameter.

Am i doing something wrong ?

 

[PhoneyDeveloper]

It needs to be a class method. Look at the UIColor header.

 

[erdinc27]

It needs to be a class method. Look at the UIColor header.

That was the answer. Thank you buddy.

 

[PhoneyDeveloper]

Few other comments. There are a number of UIColor extensions on github that one might want to use or look at.

There are some questions I have about the best way to implement these UIColor extensions that I always have in every app. In Objective-C you can have function-scope static variables so the app only ever needs to build a single instance of your UIColor objects. There are no such function-scope statics in swift. In swift you can have file-scope let constants, which gives you a similar kind of constant. In the code shown above the method is building a new UIColor object every time it's called, which maybe isn't a terrible thing but seems slightly wasteful.

I haven't dug into this very deeply and I wonder what the best way to implement these UIColor extensions is in swift. I'm currently doing it like this

private let mainColor = UIColor(red: 224, green: 0, blue: 30, alpha: 1.0)
class func theMainColor() -> UIColor {
        return mainColor
}

However, if you've got a library of colors and a given app will only ever use a few of them it also seems wasteful to have private let constants for all the colors.

(There's also a way of having a private struct inside the class in order to have class variables but that seemed too goofy to me.)

Comments?

 

[erdinc27]

Few other comments. There are a number of UIColor extensions on github that one might want to use or look at.

There are some questions I have about the best way to implement these UIColor extensions that I always have in every app. In Objective-C you can have function-scope static variables so the app only ever needs to build a single instance of your UIColor objects. There are no such function-scope statics in swift. In swift you can have file-scope let constants, which gives you a similar kind of constant. In the code shown above the method is building a new UIColor object every time it's called, which maybe isn't a terrible thing but seems slightly wasteful.

I haven't dug into this very deeply and I wonder what the best way to implement these UIColor extensions is in swift. I'm currently doing it like this

private let mainColor = UIColor(red: 224, green: 0, blue: 30, alpha: 1.0)
class func theMainColor() -> UIColor {
        return mainColor
}

However, if you've got a library of colors and a given app will only ever use a few of them it also seems wasteful to have private let constants for all the colors.

(There's also a way of having a private struct inside the class in order to have class variables but that seemed too goofy to me.)

Comments?

Actually i have done the same way u shared the code. But if i learn better way then i will share it here for sure.