Looping an object in Swift - ios

Question

I'm having a problem with looping an object in Swift.
I want to declare the UITextfield as an instance variable so I can access it anywhere inside the class.
So if I put it inside the loop it works fine, but I put the variable of UITextField outside the loop, it doesn't show the first textfield in the view and the username textfield would be missing.
Here's my code
var placeHolderArr:[String] = ["Username", "Password"]
let loginField = UITextField() // <----- this one
override func viewDidLoad() {
super.viewDidLoad()
let logoHolder = UIView(frame: CGRect(x: 0, y: 0, width: self.view.frame.width, height: self.view.frame.height / 2))
logoHolder.backgroundColor = self.utils.hexStringToUIColor(hex: "#ff8f00")
for index in 0...1 {
let height = index * 60
// When I declare the textfield variable in this line, it works fine.
loginField.frame = CGRect(x: 0 , y: Int((logoHolder.frame.maxY + 30) + CGFloat(height)), width: Int(self.view.frame.width - 80), height: 50)
loginField.placeholder = placeHolderArr [index]
loginField.font = UIFont.systemFont(ofSize: 15)
loginField.borderStyle = UITextBorderStyle.roundedRect
loginField.autocorrectionType = UITextAutocorrectionType.no
loginField.keyboardType = UIKeyboardType.default
loginField.returnKeyType = UIReturnKeyType.done
loginField.clearButtonMode = UITextFieldViewMode.whileEditing;
loginField.contentVerticalAlignment = UIControlContentVerticalAlignment.center
loginField.center.x = self.view.center.x
loginField.delegate = self
loginField.tag = index
innerY = Int(loginField.frame.maxY)
print("index\(index)" )
self.view.addSubview(loginField)
}
}
Please see the screenshot below
Textfield when declared inside the loop:
Textfield when declared outside the loop:

Answer 1

Obviously you use the same UITextField. Judt put initialization inside the loop
for index in 0...1 {
let height = index * 60
// When I declare the textfield variable in this line, it works fine.
loginField = UITextField()
loginField.frame = CGRect(x: 0 , y: Int((logoHolder.frame.maxY + 30) + CGFloat(height)), width: Int(self.view.frame.width - 80), height: 50)
loginField
And to use it later use array:
var fieldArr:[UITextField] = []
Then later:
fieldArr.append(loginField)
Summarise:
var placeHolderArr:[String] = ["Username", "Password"]
let loginFields:[UITextField] = []
override func viewDidLoad() {
super.viewDidLoad()
let logoHolder = UIView(frame: CGRect(x: 0, y: 0, width: self.view.frame.width, height: self.view.frame.height / 2))
logoHolder.backgroundColor = self.utils.hexStringToUIColor(hex: "#ff8f00")
for index in 0...1 {
let loginField = UITextField()
let height = index * 60
// When I declare the textfield variable in this line, it works fine.
loginField.frame = CGRect(x: 0 , y: Int((logoHolder.frame.maxY + 30) + CGFloat(height)), width: Int(self.view.frame.width - 80), height: 50)
loginField.placeholder = placeHolderArr [index]
loginField.font = UIFont.systemFont(ofSize: 15)
loginField.borderStyle = UITextBorderStyle.roundedRect
loginField.autocorrectionType = UITextAutocorrectionType.no
loginField.keyboardType = UIKeyboardType.default
loginField.returnKeyType = UIReturnKeyType.done
loginField.clearButtonMode = UITextFieldViewMode.whileEditing;
loginField.contentVerticalAlignment = UIControlContentVerticalAlignment.center
loginField.center.x = self.view.center.x
loginField.delegate = self
loginField.tag = index
innerY = Int(loginField.frame.maxY)
print("index\(index)" )
self.view.addSubview(loginField)
loginFields.append(loginField)
}
}

Answer 2

When you declare the UITextfield subclass outside your loop, than every time when you set it up, you set up the same UITextfield instance. This means, you are overriding the first set of properties with the next one, every time you iterate on it.
Instead, lets create two instances, and set up both independently:
// declare this outside your loop
let usernameField = UITextField()
let passwordField = UITextField()
for (index, loginField) in [usernameField, passwordField].enumerated() {
// do your setup
}

Answer 3

You can create two properties:
let usernameField = UITextField()
let passwordField = UITextField()
and loop every text field like:
for (index, loginField) in [usernameField, passwordField].enumerated() {
//do what you need
}