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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:-
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// 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 :-
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//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:-
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// 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
You can also check the extension of UIView
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