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updated FontLabelAttribute for Kerning/line spacing/ line height

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Signed-off-by: Matt Bruce <matt.bruce@verizon.com>
This commit is contained in:
Matt Bruce 2022-11-10 14:43:02 -06:00
parent 64d9ca3777
commit e46017f315
1 changed files with 40 additions and 2 deletions
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42
VDS/Components/Label/Attributes/FontLabelAttribute.swift
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@ -24,21 +24,59 @@ public struct FontLabelAttribute: LabelAttributeModel {
public var length: Int
public var style: TypographicalStyle
public var color: UIColor
public var textPosition: TextPosition
public var lineBreakMode: NSLineBreakMode
//--------------------------------------------------
// MARK: - Initializer
//--------------------------------------------------
public init(location: Int, length: Int, style: TypographicalStyle, color: UIColor = .black) {
public init(location: Int, length: Int, style: TypographicalStyle, color: UIColor = .black, textPosition: TextPosition = .left, lineBreakMode: NSLineBreakMode = .byWordWrapping) {
self.location = location
self.length = length
self.style = style
self.color = color
self.textPosition = textPosition
self.lineBreakMode = lineBreakMode
}
public func setAttribute(on attributedString: NSMutableAttributedString) {
attributedString.removeAttribute(.font, range: range)
attributedString.removeAttribute(.foregroundColor, range: range)
attributedString.addAttribute(.font, value: style.font, range: range)
attributedString.addAttribute(.foregroundColor, value: color, range: range)
setStyleAttributes(attributedString)
}
private func setStyleAttributes(_ attributedString: NSMutableAttributedString) {
//set letterSpacing
if style.letterSpacing > 0.0 {
attributedString.removeAttribute(.kern, range: range)
attributedString.addAttribute(.kern, value: style.letterSpacing, range: range)
}
//set lineHeight
if style.lineHeight > 0.0 {
let lineHeight = style.lineHeight
let adjustment = lineHeight > style.font.lineHeight ? 2.0 : 1.0
let baselineOffset = (lineHeight - style.font.lineHeight) / 2.0 / adjustment
let paragraph = NSMutableParagraphStyle().with {
$0.maximumLineHeight = lineHeight
$0.minimumLineHeight = lineHeight
$0.alignment = textPosition.textAlignment
$0.lineBreakMode = lineBreakMode
}
attributedString.removeAttribute(.baselineOffset, range: range)
attributedString.removeAttribute(.paragraphStyle, range: range)
attributedString.addAttribute(.baselineOffset, value: baselineOffset, range: range)
attributedString.addAttribute(.paragraphStyle, value: paragraph, range: range)
} else if textPosition != .left {
let paragraph = NSMutableParagraphStyle().with {
$0.alignment = textPosition.textAlignment
$0.lineBreakMode = lineBreakMode
}
attributedString.removeAttribute(.paragraphStyle, range: range)
attributedString.addAttribute(.paragraphStyle, value: paragraph, range: range)
}
}
}