How to solve "auto-scroll" in UITextView? - ios

Question

I have written a functionscrollToVisible() to scroll text in UItextview because some part of text is covered by the keyboard, or the cursor isn't in visible. But UItextview can scroll the text automatically when the cursor is not in the whole view but not visible, it can still be covered by keyboard by automatically scroll.The UItextview's auto scroll can interrupt my scrollToVisible().
Thus, can I ban the UItexview to scroll automatically? Or another way to solve "keyboard cover" problem?
My scrollToVisible() function
func scrollToVisible()
{
let cursortop = self.EditArea.convert(self.EditArea.caretRect(for: (self.EditArea.selectedTextRange?.start)!).origin, to: self.view)
var cursorbottom = cursortop
cursorbottom.y += self.EditArea.caretRect(for: (self.EditArea.selectedTextRange?.start)!).height
let bottom = UIScreen.main.bounds.size.height - self.EditArea.textContainerInset.bottom
var contentOffset = self.EditArea.contentOffset
if cursortop.y <= 85
{
contentOffset.y = contentOffset.y - 85 + cursortop.y
self.EditArea.setContentOffset(contentOffset, animated: true)
}
else if cursorbottom.y >= bottom
{
contentOffset.y = contentOffset.y - bottom + cursorbottom.y
self.EditArea.setContentOffset(contentOffset, animated: true)
}
}
PS:this EditArea is the textview

Answer 1

I have a similar problem: when you open the keyboard, the text view is not adjusted and the cursor hides behind the keyboard (or as you say "covers" the cursor). So if I hit enter to start a new line, it also doesn't visibly auto scroll (actually it does, but it's behind the keyboard). I found a solution, which works perfectly for me on this website: https://www.hackingwithswift.com/example-code/uikit/how-to-adjust-a-uiscrollview-to-fit-the-keyboard
Solution extracted from above website using swift 4:
Subscribe for the events when the keyboard appears and disappears in your viewDidLoad() function:
// For avoiding that the text cursor disappears behind the keyboard, adjust the text for it
let notificationCenter = NotificationCenter.default
notificationCenter.addObserver(self, selector: #selector(adjustForKeyboard), name: .UIKeyboardWillHide, object: nil)
notificationCenter.addObserver(self, selector: #selector(adjustForKeyboard), name: .UIKeyboardWillChangeFrame, object: nil)
Adjust the textview using this function, add it anywhere in your class:
// Adjusts the textView, so that the text cursor does not disappear behind the keyboard
#objc func adjustForKeyboard(notification: Notification) {
let userInfo = notification.userInfo!
let keyboardScreenEndFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
let keyboardViewEndFrame = view.convert(keyboardScreenEndFrame, from: view.window)
if notification.name == Notification.Name.UIKeyboardWillHide {
textView.contentInset = UIEdgeInsets.zero
} else {
textView.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: keyboardViewEndFrame.height, right: 0)
}
textView.scrollIndicatorInsets = textView.contentInset
let selectedRange = textView.selectedRange
textView.scrollRangeToVisible(selectedRange)
}

Answer 2

Here is my solution, where you need not worry to handle any textfield/textview in the app by writing just one line of code in app delegate
If you are using pods, the you can add "IQKeyboardManager" pods by just adding the following pods
pod 'IQKeyboardManagerSwift'
and add this line in didFinishLaunchingWithOptions in app delegate
IQKeyboardManager.sharedManager().enable = true