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Auto Scroll to Bottom On Keyboard Reveal #78

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Auto Scroll to Bottom On Keyboard Reveal #78

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1c40df4
automatically scroll to the bottom of scroll content view when keyboa…
jasonaibrahim Sep 15, 2018
0071794
change default behavior for keyboard reveal to not reveal
jasonaibrahim Oct 2, 2018
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14 changes: 10 additions & 4 deletions MessageViewController/MessageViewController.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,7 @@ open class MessageViewController: UIViewController, MessageAutocompleteControlle
internal var scrollView: UIScrollView?
internal var keyboardHeight: CGFloat = 0
internal var isMessageViewHidden = false
internal var scrollsToBottomOnKeyboardReveal = false

internal func commonInit() {
messageView.delegate = self
Expand Down Expand Up @@ -182,16 +183,21 @@ open class MessageViewController: UIViewController, MessageAutocompleteControlle

let scrollViewHeight = scrollView.bounds.height
let contentHeight = scrollView.contentSize.height
let inset = scrollView.util_adjustedContentInset
let topInset = scrollView.util_adjustedContentInset.top
let bottomSafeInset = self.view.util_safeAreaInsets.bottom

let newOffset = max(
var newOffset = max(
min(
contentHeight - scrollViewHeight + inset.bottom,
contentHeight - scrollViewHeight,
contentOffset.y + self.keyboardHeight - previousKeyboardHeight - bottomSafeInset
),
-inset.top
-topInset
)

if self.scrollsToBottomOnKeyboardReveal && contentHeight > scrollViewHeight {
newOffset = contentHeight - scrollViewHeight
}

scrollView.contentOffset = CGPoint(x: contentOffset.x, y: newOffset)
}
}
Expand Down