How to move view if only a certain textView is selected - ios

Question

Hi I am using this code to move my view when a textView is selected, this is to make sure my texView is visible for when the keyboard pops up.
override func viewDidLoad() {
super.viewDidLoad() NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name:UIKeyboardWillShowNotification, object: self.view.window)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name:UIKeyboardWillHideNotification, object: self.view.window)
}
func keyboardWillHide(sender: NSNotification) {
let userInfo: [NSObject : AnyObject] = sender.userInfo!
let keyboardSize: CGSize = userInfo[UIKeyboardFrameBeginUserInfoKey]!.CGRectValue.size
self.view.frame.origin.y += keyboardSize.height
}
func keyboardWillShow(sender: NSNotification) {
let userInfo: [NSObject : AnyObject] = sender.userInfo!
let keyboardSize: CGSize = userInfo[UIKeyboardFrameBeginUserInfoKey]!.CGRectValue.size
let offset: CGSize = userInfo[UIKeyboardFrameEndUserInfoKey]!.CGRectValue.size
if keyboardSize.height == offset.height {
if self.view.frame.origin.y == 0 {
UIView.animateWithDuration(0.1, animations: { () -> Void in
self.view.frame.origin.y -= keyboardSize.height
})
}
} else {
UIView.animateWithDuration(0.1, animations: { () -> Void in
self.view.frame.origin.y += keyboardSize.height - offset.height
})
}
print(self.view.frame.origin.y)
}
override func viewWillDisappear(animated: Bool) {
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: self.view.window)
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: self.view.window)
}
How can i only move the view if the bottom textView is selected? Because currently if you select the uppermost textView it moves half of it off screen.
I appreciate any help, thanks in advance.

Answer 1

In the notification callbacks check for bottomTextView.isFirstResponder() and move the view only if its true. Otherwise don't move the view.

Answer 2

Make your class a UITextViewDelegate like so:
class ViewController: UIViewController, UITextViewDelegate {
Then in viewDidLoad set only the bottom textView to be controlled by the delegate:
bottomTextView.delegate = self
Then you can use these functions, changing the values to suit your needs:
func textViewDidBeginEditing(textView: UITextView) {
self.view.frame.origin.y -= 150
}
func textViewDidEndEditing(textView: UITextView) {
self.view.frame.origin.y += 150
}

Answer 3

Rather than only moving the keyboard for a single text field, I suggest a more flexible approach.
What I do is to keep track of which text field is being selected and do some calculations to move the view controller's content view up just enough to expose the text field that is becoming active.
To do that you need to set up your view controller to be the text fields' delegates.
I have a development blog post that explains this in detail:
Shifting views to make room for the keyboard
The code in that post is in Objective-C, but the concepts are identical. I'm not sure I have the same code in Swift that I can share (The only code I've found is in a project I did for a client.)
That blog post references a project called RandomBlobs on Github.

Answer 4

I would suggest using a delegate. For example, you can set you bottom textView's delegate to self (add UITextViewDelegate first of course) and implement the
textViewDidBeginEditing(_:) method. When that's triggered, you will know that the user started editing this particular view.