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40 lines
1.2 KiB
Swift
40 lines
1.2 KiB
Swift
//
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// UIFont + Traits.swift
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// CovidSafe
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//
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// Copyright © 2020 Australian Government. All rights reserved.
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//
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import UIKit
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extension UIFont {
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static func preferredFont(for style: TextStyle, weight: Weight) -> UIFont {
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if #available(iOS 11.0, *) {
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let desc = UIFontDescriptor.preferredFontDescriptor(withTextStyle: style)
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let font = UIFont.systemFont(ofSize: desc.pointSize, weight: weight)
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return font
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} else {
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if weight == .bold {
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return UIFont.preferredFont(forTextStyle: style).bold()
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}
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return UIFont.preferredFont(forTextStyle: style)
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}
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}
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func withTraits(traits:UIFontDescriptor.SymbolicTraits) -> UIFont {
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guard let descriptor = fontDescriptor.withSymbolicTraits(traits) else {
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//unable to get descriptor, leave as is and do not add traits
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return self
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}
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return UIFont(descriptor: descriptor, size: 0) //size 0 means keep the size as it is
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}
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func bold() -> UIFont {
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return withTraits(traits: .traitBold)
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}
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func italic() -> UIFont {
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return withTraits(traits: .traitItalic)
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}
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}
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