Avoid copying code for a lot of buttons - swift

Question

Edit on my question:
Grimxn, I made a subclass and can see it works, because of the borderWidth and color. But I still have a couple of questions on how to add my function:
Should I code "func textField(textField: UITextField" or "func textField(textField: MyCustomTextField" ?
What should I do with "if textField == numberField01 {" ?
How do I 'call this' from the ViewController code ?
class ViewController: UIViewController, UITextFieldDelegate {
#IBOutlet weak var numberField01: UITextField!
#IBOutlet weak var numberField02: MyCustomTextField!
override func viewDidLoad() {
super.viewDidLoad()
numberField01.delegate = self
numberField01.keyboardType = UIKeyboardType.NumberPad
numberField02.delegate = self
numberField02.keyboardType = UIKeyboardType.NumberPad
}
class MyCustomTextField: UITextField {
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.layer.borderColor = UIColor.redColor().CGColor
self.layer.borderWidth = 1.5
func textField(textField: UITextField,
shouldChangeCharactersInRange range: NSRange,
replacementString string: String)
-> Bool {
var result = true
var prospectiveText = (textField.text as NSString).stringByReplacingCharactersInRange(range, withString: string)
prospectiveText = prospectiveText.stringByReplacingOccurrencesOfString(".", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil)
if textField == numberField01 {
if count(string)>0 {
let disallowedCharacterSet = NSCharacterSet(charactersInString: "0123456789").invertedSet
let replacementStringIsLegal = string.rangeOfCharacterFromSet(disallowedCharacterSet) == nil
let resultingStringLengthIsLegal = count(prospectiveText) <= 4
let scanner = NSScanner(string: prospectiveText)
let resultingTextIsNumeric = scanner.scanDecimal(nil) && scanner.atEnd
result = replacementStringIsLegal && resultingStringLengthIsLegal && resultingTextIsNumeric
}
}
return result
}
}
}
Original question:
The following code is working fine for one textfield (numberField01). It makes sure the input is decimal only, places a decimal point, and prevents a user to paste in a non decimal string. But I have a lot more buttons... (numberField02 and up). How can I handle more buttons, without just copying my code for each button?
class ViewController: UIViewController, UITextFieldDelegate {
#IBOutlet weak var numberField01: UITextField!
#IBOutlet weak var numberField02: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
numberField01.delegate = self
numberField01.keyboardType = UIKeyboardType.NumberPad
numberField02.delegate = self
numberField02.keyboardType = UIKeyboardType.NumberPad
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
// Tap background to add decimal point and defocus keyboard
#IBAction func userTappedBackground(sender: AnyObject) {
for view in self.view.subviews as! [UIView] {
if let textField = view as? UITextField {
if count(numberField01.text) > 0 {
var numberString = numberField01.text
numberString = numberString.stringByReplacingOccurrencesOfString(".", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil)
var numberFromString = Double(numberString.toInt()!) / 100
numberField01.text = String(format:"%.2f", numberFromString)
}
textField.resignFirstResponder()
}
}
}
func textField(textField: UITextField,
shouldChangeCharactersInRange range: NSRange,
replacementString string: String)
-> Bool {
var result = true
var prospectiveText = (textField.text as NSString).stringByReplacingCharactersInRange(range, withString: string)
prospectiveText = prospectiveText.stringByReplacingOccurrencesOfString(".", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil)
if textField == numberField01 {
if count(string)>0 {
let disallowedCharacterSet = NSCharacterSet(charactersInString: "0123456789").invertedSet
let replacementStringIsLegal = string.rangeOfCharacterFromSet(disallowedCharacterSet) == nil
let resultingStringLengthIsLegal = count(prospectiveText) <= 4
let scanner = NSScanner(string: prospectiveText)
let resultingTextIsNumeric = scanner.scanDecimal(nil) && scanner.atEnd
result = replacementStringIsLegal && resultingStringLengthIsLegal && resultingTextIsNumeric
}
}
return result
}
}

Answer 1

So something similar to the following:
Button GetButtonCommonFeatures(Button myButton)
{
Write common code here....
e.g. myButton.delegate = self;...
return myButton;
}
Then call your method for each button. Lets take numberField01 for example. You will include the code in the method that applies to every button.
numberField01 = GetButtonCommonFeatures(numberField01);
Hope this helps