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Save and Restore contentInset and scrollIndicatorInsets #1

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Save and Restore contentInset and scrollIndicatorInsets #1

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ce8fe86
Restore the scrollView’s contentInset and scrollIndicatorInset
May 18, 2020
3adabbb
removed unused key
May 18, 2020
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44 changes: 38 additions & 6 deletions UIViewController+Keyboard.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -7,8 +7,6 @@

import UIKit

private var scrollViewKey : UInt8 = 0

extension UIViewController {

public func setupKeyboardNotifcationListenerForScrollView(_ scrollView: UIScrollView) {
Expand All @@ -22,12 +20,44 @@ extension UIViewController {
NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
}

private struct SingleLineKeyboardResizeKeys {
static var ScrollViewKey = "single_line_scroll_view_key"
static var ScrollViewContentInsetsKey = "single_line_content_insets_key"
static var ScrollIndicatorInsetsKey = "single_line_indicator_insets_key"
}

fileprivate var internalScrollView: UIScrollView! {
get {
return objc_getAssociatedObject(self, &scrollViewKey) as? UIScrollView
return objc_getAssociatedObject(self, &SingleLineKeyboardResizeKeys.ScrollViewKey) as? UIScrollView
}
set(newValue) {
objc_setAssociatedObject(self, &SingleLineKeyboardResizeKeys.ScrollViewKey, newValue, .OBJC_ASSOCIATION_ASSIGN)
}
}

fileprivate var internalScrollViewContentInsets: UIEdgeInsets {
get {
if let value = objc_getAssociatedObject(self, &SingleLineKeyboardResizeKeys.ScrollViewContentInsetsKey) as? NSValue {
return value.uiEdgeInsetsValue
}
return .zero
}
set(newValue) {
let value = NSValue.init(uiEdgeInsets: newValue)
objc_setAssociatedObject(self, &SingleLineKeyboardResizeKeys.ScrollViewContentInsetsKey, value, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}

fileprivate var internalScrollViewIndicatorInsets: UIEdgeInsets {
get {
if let value = objc_getAssociatedObject(self, &SingleLineKeyboardResizeKeys.ScrollIndicatorInsetsKey) as? NSValue {
return value.uiEdgeInsetsValue
}
return .zero
}
set(newValue) {
objc_setAssociatedObject(self, &scrollViewKey, newValue, .OBJC_ASSOCIATION_ASSIGN)
let value = NSValue.init(uiEdgeInsets: newValue)
objc_setAssociatedObject(self, &SingleLineKeyboardResizeKeys.ScrollIndicatorInsetsKey, value, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}

Expand All @@ -39,6 +69,8 @@ extension UIViewController {
let options = UIView.AnimationOptions.beginFromCurrentState
UIView.animate(withDuration: animationDuration, delay: 0, options:options, animations: { () -> Void in
let insetHeight = (self.internalScrollView.frame.height + self.internalScrollView.frame.origin.y) - keyboardFrameConvertedToViewFrame.origin.y
self.internalScrollViewContentInsets = self.internalScrollView.contentInset
self.internalScrollViewIndicatorInsets = self.internalScrollView.scrollIndicatorInsets
self.internalScrollView.contentInset = UIEdgeInsets.init(top: 0, left: 0, bottom: insetHeight, right: 0)
self.internalScrollView.scrollIndicatorInsets = UIEdgeInsets.init(top: 0, left: 0, bottom: insetHeight, right: 0)
}) { (complete) -> Void in
Expand All @@ -50,8 +82,8 @@ extension UIViewController {
let animationDuration = userInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as! TimeInterval
let options = UIView.AnimationOptions.beginFromCurrentState
UIView.animate(withDuration: animationDuration, delay: 0, options:options, animations: { () -> Void in
self.internalScrollView.contentInset = UIEdgeInsets.init(top: 0, left: 0, bottom: 0, right: 0)
self.internalScrollView.scrollIndicatorInsets = UIEdgeInsets.init(top: 0, left: 0, bottom: 0, right: 0)
self.internalScrollView.contentInset = self.internalScrollViewContentInsets
self.internalScrollView.scrollIndicatorInsets = self.internalScrollViewIndicatorInsets
}) { (complete) -> Void in
}
}
Expand Down