Custom TextField layer / background / adapt using swift - swift

Question

I would like to know if it's possible to create a custom background for a textfield using swift, for example expecting 4 letters, the textfield has 4 square. thx

Answer 1

Do you mean like this?
// Background
txtField.backgroundColor = UIColor.greenColor()
// Placeholder
txtField.placeholder = "1"
// Corner radius
txtField.layer.cornerRadius = 8
// A Boolean indicating whether sublayers are clipped to the layer’s bounds
txtField.layer.masksToBounds = true
UPDATE
Here is a method that will randomize a number and then create textfields according to the number that has been generated. You don´t need the random functionality of course if you already have a number. The only thing you have to do is change for var i = 0; i < rand; i++ rand to your variable. The textFieldEditingChanged function is the event when the users tries to add a new character to the textField and there is a check to only allow one character in each textField.
let rand = Int(arc4random_uniform(10) + 2)
for var i = 0; i < rand; i++ {
let myField: UITextField = UITextField (frame:CGRectMake(CGFloat(i * 30), 50, 25, 25));
myField.text = String(i)
myField.backgroundColor = UIColor.redColor()
myField.addTarget(self, action: "textFieldEditingChanged:", forControlEvents: UIControlEvents.EditingChanged)
self.view.addSubview(myField)
}
If you only have a String and you want to populate each char in a textField, you could do like this:
let word = "Car"
for var i = 0; i < word.characters.count; i++ {
let myField: UITextField = UITextField (frame:CGRectMake(CGFloat(i * 30), 50, 25, 25));
myField.text = String(word[word.startIndex.advancedBy(i)])
myField.backgroundColor = UIColor.redColor()
myField.addTarget(self, action: "textFieldEditingChanged:", forControlEvents: UIControlEvents.EditingChanged)
self.view.addSubview(myField)
}
Click event for the textField
func textFieldEditingChanged(target: UITextField){
if (target.text?.characters.count > 1){
target.text = target.text?.substringToIndex(target.text!.endIndex.predecessor())
}
}
UPDATE
To change responder
Declare a variable var tagNumber = 0 and when you loop through in your for statement and create your textFields just add this row to myField.tag = i. In your textFieldEditingChanged function, add this code block:
if (target.tag < tagNumber){
let nextTag: NSInteger = target.tag + 1;
// Try to find next responder
if let nextResponder: UIResponder! =
target.superview!.viewWithTag(nextTag){
nextResponder.becomeFirstResponder()
}
}