How to access extension of UIColor in SWIFT?

How to access extension of UIColor in SWIFT?

i am very new to swift and trying to create an extension of UIColor class as

extension UIColor{        func getCustomBlueColor() -> UIColor{        return UIColor(red:0.043, green:0.576 ,blue:0.588 , alpha:1.00)        }  

After this i accessed the method as

btnShare.setTitleColor(UIColor.getCustomBlueColor(**UIColor**), forState: UIControlState.Normal)  

I dont know what I should pass as an argument to this statement.

Answer by RoNiT for How to access extension of UIColor in SWIFT?

You just need to change your statement like,

 btnShare.setTitleColor(UIColor().getCustomBlueColor(), forState:.Normal)  

More detailed explanation is here.

Answer by Martin R for How to access extension of UIColor in SWIFT?

You have defined an instance method, which means that you can call it only on an UIColor instance:

let col = UIColor().getCustomBlueColor()  // or in your case:  btnShare.setTitleColor(UIColor().getCustomBlueColor(), forState: .Normal)  

The compiler error "missing argument" occurs because Instance Methods are Curried Functions in Swift, so it could equivalently be called as

let col = UIColor.getCustomBlueColor(UIColor())()  

(But that would be a strange thing to do, and I have added it only to explain where the error message comes from.)

---

But what you really want is a type method (class func)

extension UIColor{      class func getCustomBlueColor() -> UIColor{          return UIColor(red:0.043, green:0.576 ,blue:0.588 , alpha:1.00)      }  }  

which is called as

let col = UIColor.getCustomBlueColor()  // or in your case:  btnShare.setTitleColor(UIColor.getCustomBlueColor(), forState: .Normal)  

without the need to create an UIColor instance first.

Answer by Chuck for How to access extension of UIColor in SWIFT?

You defined a instance function. It means you need an instance of UIColor in case to use getCustomBlueColor()-method.

It looks like you want to have a class method, instead of the instance method. So you have to change your definition like this:

extension UIColor{      class func getCustomBlueColor() -> UIColor{          return UIColor(red:0.043, green:0.576 ,blue:0.588 , alpha:1.00)      }  }  

Note the 'class' before func, so the method is now accessible as a class method.

The same story using class methods in a structure:

struct MyColors{      static func getCustomBlueColor() -> UIColor{          return UIColor(red:0.043, green:0.576 ,blue:0.588 , alpha:1.00)      }  }  let color = MyColors.getCustomBlueColor()  

If you just want to have a class with some color definitions, I recommend you to use a struct over a class or extension:

struct MyColors{      static var getCustomBlueColor = { return UIColor(red:0.043, green:0.576 ,blue:0.588 , alpha:1.00) }  }  let color = MyColors.getCustomBlueColor()  

Answer by Eric Hodgins for How to access extension of UIColor in SWIFT?

Could use a computed property:

extension UIColor {    var customBlueColor: UIColor {      return UIColor(red:0.043, green:0.576 ,blue:0.588 , alpha:1.00)    }  }  

And then to call it:

UIColor().customBlueColor  

Answer by Gene Loparco for How to access extension of UIColor in SWIFT?

I don't know why Eric Hodgins was down voted, as his answer is the most "Swift 3 like" answer of the bunch.

With Swift 3, predefined UIColors are used accordingly:

var myColor: UIColor = .white // or .clear or whatever  

Therefore, if you want something similar, such as the following...

var myColor: UIColor = .myCustomColor  

...then, you would define the extension like so:

extension UIColor      {      public class var myCustomColor: UIColor          {          return UIColor(red: 248/255, green: 248/255, blue: 248/255, alpha: 1.0)          }      }  

In fact, Apple defines white as:

public class var white: UIColor  

Fatal error: Call to a member function getElementsByTagName() on a non-object in D:\XAMPP INSTALLASTION\xampp\htdocs\endunpratama9i\www-stackoverflow-info-proses.php on line 72