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This commit is contained in:
Kevin G Christiano 2019-10-17 12:39:05 -04:00
parent 11b2ddc4dd
commit 73ac4b932b
1 changed files with 13 additions and 6 deletions
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19
MVMCoreUI/Atoms/Views/Label.swift
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@ -506,14 +506,17 @@ public typealias ActionBlock = () -> ()
clauses.append(ActionableClause(range: range, actionBlock: actionBlock, accessibilityID: accessibleAction?.hash ?? -1))
}
/// Provides a text container in memory of how the text would appear on screen.
func abstractTextContainer() -> NSTextContainer? {
/**
Provides a text container and layout manager of how the text would appear on screen.
They are used in tandem to derive low-level TextKit results of the label.
*/
public func abstractTextContainer() -> (NSTextContainer, NSLayoutManager)? {
// Must configure the attributed string to translate what would appear on screen to accurately analyze.
guard let attributedText = attributedText else { return nil }
let paragraph = NSMutableParagraphStyle()
paragraph.alignment = label.textAlignment
paragraph.alignment = textAlignment
let stagedAttributedString = NSMutableAttributedString(attributedString: attributedText)
stagedAttributedString.addAttributes([NSAttributedString.Key.paragraphStyle: paragraph], range: NSRange(location: 0, length: attributedText.string.count))
@ -530,12 +533,14 @@ public typealias ActionBlock = () -> ()
textContainer.maximumNumberOfLines = numberOfLines
textContainer.size = bounds.size
return textContainer
return (textContainer, layoutManager)
}
public static func boundingRect(forCharacterRange range: NSRange, in label: Label) -> CGRect {
let textContainer = abstractTextContainer()
guard let abstractContainer = label.abstractTextContainer() else { return CGRect() }
let textContainer = abstractContainer.0
let layoutManager = abstractContainer.1
var glyphRange = NSRange()
@ -678,7 +683,9 @@ extension UITapGestureRecognizer {
return true
}
guard let textContainer = label.abstractTextContainer() else { return false }
guard let abstractContainer = label.abstractTextContainer() else { return false }
let textContainer = abstractContainer.0
let layoutManager = abstractContainer.1
let indexOfGlyph = layoutManager.glyphIndex(for: location(in: label), in: textContainer)