UIview kept going at the bottom of the UIViewcontroller - swift

Question

My LoginViewController has a UIView that has 2 UItextfield and 1 UIbutton. The moment the user start writting the UIView should go up and leave space for the keyboard. However my problem is when the keyboard disappear the UIView did not go at its initial position. Can anyone help me please Thank you ... (my code is below)
func keyboardON(sender: NSNotification) {
let info = sender.userInfo!
var keyboardSize = info[UIKeyboardFrameBeginUserInfoKey]!.CGRectValue().size
println("keyboard height \(keyboardSize.height)")
var frame = otherContainerView.frame
println("MainScreen :\(UIScreen.mainScreen().bounds.height)")
frame.origin.y = UIScreen.mainScreen().bounds.height - keyboardSize.height - frame.size.height
otherContainerView.frame = frame
}
func keyboardNotOn(sender: NSNotification) {
let info = sender.userInfo!
var keyboardSize = info[UIKeyboardFrameBeginUserInfoKey]!.CGRectValue().size
println("keyboard height \(keyboardSize.height)")
var frame = otherContainerView.frame
frame.origin.y = UIScreen.mainScreen().bounds.height - frame.size.height
otherContainerView.frame = frame
}

Answer 1

I would suggest that you change this view controller to a UITableViewController with static cells. When using a UITableViewController, the scrolling is automatically handled, thus making your problem not problem at all.
If I understand your initial question correctly, you are trying to create a login screen in a UIViewController, which is fine, but much harder than it would be to simply create a UITableViewController. The image above was made with a UITableViewController. When the text fields are selected, it slides up, and when they are deselected, it moves back to it's initial view. If you switch to a UITableViewController, (even if you place both UITextFields and the button in one cell), you won't need to do any of this programmatically. The storyboard will handle the desired changes.
import UIKit
class LoginTableViewController: UITableViewController {
#IBOutlet weak var usernameTextField : UITextField!
#IBOutlet weak var passwordTextField : UITextField!
#IBAction func login (sender: UIButton) {
//login button
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
//If you choose to use 3 cells in your storyboard (like I've done with my login screen) you will return 3 here. If you choose to put all of the items in one cell, return 1 below.
return 3
}
}