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Fixed Constraints Breaking and Content Size Calculations

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This commit is contained in:
Nathan Tannar
2017-12-06 19:22:45 -08:00
parent dd893232a0
commit 0b49b3573f
1 changed files with 31 additions and 12 deletions
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Sources/Views/MessageInputBar.swift
+31 -12
View File
@@ -204,13 +204,19 @@ open class MessageInputBar: UIView {
public private(set) var isOverMaxTextViewHeight = false
/// The maximum height that the InputTextView can reach
open var maxTextViewHeight: CGFloat = UIScreen.main.bounds.height / 3 {
open var maxTextViewHeight: CGFloat = (UIScreen.main.bounds.height / 3).rounded(.down) {
didSet {
textViewHeightAnchor?.constant = maxTextViewHeight
invalidateIntrinsicContentSize()
}
}
/// The height that will fit the current text in the InputTextView based on its current bounds
public var requiredInputTextViewHeight: CGFloat {
let maxTextViewSize = CGSize(width: inputTextView.bounds.width, height: .greatestFiniteMagnitude)
return inputTextView.sizeThatFits(maxTextViewSize).height.rounded(.down)
}
/// The fixed widthAnchor constant of the leftStackView
public private(set) var leftStackViewWidthConstant: CGFloat = 0 {
didSet {
@@ -363,6 +369,14 @@ open class MessageInputBar: UIView {
rightStackViewLayoutSet?.right = rightStackView.rightAnchor.constraint(equalTo: safeAreaLayoutGuide.rightAnchor, constant: -padding.right)
bottomStackViewLayoutSet?.left = bottomStackView.leftAnchor.constraint(equalTo: safeAreaLayoutGuide.leftAnchor, constant: padding.left)
bottomStackViewLayoutSet?.right = bottomStackView.rightAnchor.constraint(equalTo: safeAreaLayoutGuide.rightAnchor, constant: -padding.right)
// Change the priorities so constraints don't break when the MessageInputBar is anchored to the bottom of the window
// in `didMoveToWindow()`. They need to be set before applied for the first time.
if UIScreen.main.nativeBounds.height == 2436 {
textViewLayoutSet?.top?.priority = .defaultLow
textViewLayoutSet?.bottom?.priority = .defaultLow
bottomStackViewLayoutSet?.top?.priority = .defaultLow
}
}
activateConstraints()
}
@@ -375,8 +389,8 @@ open class MessageInputBar: UIView {
if let window = window {
bottomStackViewLayoutSet?.bottom?.isActive = false
bottomStackViewLayoutSet?.bottom = bottomStackView.bottomAnchor.constraintLessThanOrEqualToSystemSpacingBelow(window.safeAreaLayoutGuide.bottomAnchor, multiplier: 1)
activateConstraints()
textViewHeightAnchor?.isActive = true
}
}
}
@@ -414,6 +428,7 @@ open class MessageInputBar: UIView {
/// Invalidates the view’s intrinsic content size
open override func invalidateIntrinsicContentSize() {
super.invalidateIntrinsicContentSize()
[topStackView, bottomStackView, inputTextView].forEach { $0.invalidateIntrinsicContentSize() }
cachedIntrinsicContentSize = calculateIntrinsicContentSize()
if previousIntrinsicContentSize != cachedIntrinsicContentSize {
delegate?.messageInputBar(self, didChangeIntrinsicContentTo: cachedIntrinsicContentSize)
@@ -421,13 +436,15 @@ open class MessageInputBar: UIView {
}
}
/// Calculates the correct intrinsicContentSize of the MessageInputBar
// MARK: - Layout Helper Methods
/// Calculates the correct intrinsicContentSize of the MessageInputBar. This takes into account the various padding edge
/// insets, InputTextView's height and top/bottom InputStackView's heights.
///
/// - Returns: The required intrinsicContentSize
open func calculateIntrinsicContentSize() -> CGSize {
let maxTextViewSize = CGSize(width: inputTextView.bounds.width, height: .greatestFiniteMagnitude)
var inputTextViewHeight = inputTextView.sizeThatFits(maxTextViewSize).height.rounded()
var inputTextViewHeight = requiredInputTextViewHeight
if inputTextViewHeight >= maxTextViewHeight {
if !isOverMaxTextViewHeight {
textViewHeightAnchor?.isActive = true
@@ -440,17 +457,15 @@ open class MessageInputBar: UIView {
textViewHeightAnchor?.isActive = false
inputTextView.isScrollEnabled = false
isOverMaxTextViewHeight = false
inputTextView.invalidateIntrinsicContentSize()
}
}
let totalPadding = padding.top + padding.bottom + topStackViewPadding.top + textViewPadding.top + textViewPadding.bottom
let height = inputTextViewHeight + totalPadding
let verticalStackViewHeight = topStackView.bounds.height + bottomStackView.bounds.height
let height = inputTextViewHeight + totalPadding + verticalStackViewHeight
return CGSize(width: bounds.width, height: height)
}
// MARK: - Layout Helper Methods
/// Layout the given UIStackView's
/// Layout the given InputStackView's
///
/// - Parameter positions: The UIStackView's to layout
public func layoutStackViews(_ positions: [InputStackView.Position] = [.left, .right, .bottom, .top]) {
@@ -621,14 +636,18 @@ open class MessageInputBar: UIView {
items.forEach { $0.textViewDidChangeAction(with: inputTextView) }
delegate?.messageInputBar(self, textViewTextDidChangeTo: trimmedText)
invalidateIntrinsicContentSize()
if requiredInputTextViewHeight != inputTextView.bounds.height {
// Prevent un-needed content size invalidation
invalidateIntrinsicContentSize()
}
}
/// Calls each items `keyboardEditingBeginsAction` method
/// Invalidates the intrinsicContentSize so that the keyboard does not overlap the view
@objc
open func textViewDidBeginEditing() {
invalidateIntrinsicContentSize()
items.forEach { $0.keyboardEditingBeginsAction() }
}