Use extension in Swift 3

Extension in Swift 3

Using extension is swift is the best part, it saves a lot of time. Like you want to use any feature of UIView, UITextField, UIColor or Any extension of delegates methods. In Swift, you have to create extension anywhere in your project but outside the class like:-

// Extension of ColUIColorr

extension UIColor{
  }

//Extension Of UITextField

extension UITextField{
 }

//Extension Of UINavigationBar

extension UINavigationBar {
}

//Extension Of UIView

 extension UIView { 
}

// Extension of ColUIColorr

extension UIColor{

}

//Extension Of UITextField

extension UITextField{

}

//Extension Of UINavigationBar

extension UINavigationBar {

}

//Extension Of UIView

extension UIView {

}

Extensions are usable like you want to set HexaDecimalcode color function that iOS by default not provide and you want to set only bottom border of UITextfield that same iOS by default not provide and it save your lines of code instead of writing code in every class you have to write this method only once in your project example of creating extensions in iOS :-

//Extension of setting bottom border in iOS

extension UITextField {
    func bottomBorder(texField : UITextField){ 
        let topBorder = CALayer()
        topBorder.frame = CGRect(x: 0, y: 49, width: texField.frame.size.width - 10 , height: 1)
        topBorder.backgroundColor = UIColor.gray.cgColor
        texField.layer.addSublayer(topBorder)    
    }
}

//Extension of Hexa color codes in iOS

extension UIColor{
    func HexToColor(hexString: String, alpha:CGFloat? = 1.0) -> UIColor {
        // Convert hex string to an integer
        let hexint = Int(self.intFromHexString(hexStr: hexString))
        let red = CGFloat((hexint & 0xff0000) >> 16) / 255.0
        let green = CGFloat((hexint & 0xff00) >> 8) / 255.0
        let blue = CGFloat((hexint & 0xff) >> 0) / 255.0
        let alpha = alpha!
        // Create color object, specifying alpha as well
        let color = UIColor(red: red, green: green, blue: blue, alpha: alpha)
        return color
    }
    
    func intFromHexString(hexStr: String) -> UInt32 {
        var hexInt: UInt32 = 0
        // Create scanner
        let scanner: Scanner = Scanner(string: hexStr)
        // Tell scanner to skip the # character
        scanner.charactersToBeSkipped = NSCharacterSet(charactersIn: "#") as CharacterSet
        // Scan hex value
        scanner.scanHexInt32(&hexInt)
        return hexInt
    }
}

//Extension of setting bottom border in iOS

extension UITextField {

func bottomBorder(texField : UITextField){

let topBorder = CALayer()

topBorder.frame = CGRect(x: 0, y: 49, width: texField.frame.size.width - 10 , height: 1)

topBorder.backgroundColor = UIColor.gray.cgColor

texField.layer.addSublayer(topBorder)

}

//Extension of Hexa color codes in iOS

extension UIColor{

func HexToColor(hexString: String, alpha:CGFloat? = 1.0) -> UIColor {

// Convert hex string to an integer

let hexint = Int(self.intFromHexString(hexStr: hexString))

let red = CGFloat((hexint & 0xff0000) >> 16) / 255.0

let green = CGFloat((hexint & 0xff00) >> 8) / 255.0

let blue = CGFloat((hexint & 0xff) >> 0) / 255.0

let alpha = alpha!

// Create color object, specifying alpha as well

let color = UIColor(red: red, green: green, blue: blue, alpha: alpha)

return color

}

func intFromHexString(hexStr: String) -> UInt32 {

var hexInt: UInt32 = 0

// Create scanner

let scanner: Scanner = Scanner(string: hexStr)

// Tell scanner to skip the # character

scanner.charactersToBeSkipped = NSCharacterSet(charactersIn: "#") as CharacterSet

// Scan hex value

scanner.scanHexInt32(&hexInt)

return hexInt

}

How to use extension example:-

// Color Extension

title.textColor = UIColor().HexToColor(hexString: "#333333")


// Border Extension

UITextField().bottomBorder(texField: name)

// Color Extension

title.textColor = UIColor().HexToColor(hexString: "#333333")

// Border Extension

UITextField().bottomBorder(texField: name)

You can also check the extension of Navigation Bar with gradient

Add Gradient in Navigation Bar using Extension in Swift 3.0

You can also check the extension of UIView

Add Gradient in UIView using Extension in Swift 3.0

bhavuk chawla

19 Sep, 2017
Updated by - bhavuk chawla
14 Mar, 2017
Updated by - bhavuk chawla

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Use extension in Swift 3

Extension in Swift 3

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