102 lines
3.3 KiB
Swift
102 lines
3.3 KiB
Swift
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import SwiftUI
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extension NSMutableAttributedString {
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func with(font: UIFont) -> NSMutableAttributedString {
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enumerateAttribute(NSAttributedString.Key.font, in: NSMakeRange(0, length), options: .longestEffectiveRangeNotRequired, using: { (value, range, stop) in
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if let originalFont = value as? UIFont, let newFont = applyTraitsFromFont(originalFont, to: font) {
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addAttribute(NSAttributedString.Key.font, value: newFont, range: range)
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}
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})
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return self
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}
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func applyTraitsFromFont(_ originalFont: UIFont, to newFont: UIFont) -> UIFont? {
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let originalTrait = originalFont.fontDescriptor.symbolicTraits
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if originalTrait.contains(.traitBold) {
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var traits = newFont.fontDescriptor.symbolicTraits
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traits.insert(.traitBold)
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if let fontDescriptor = newFont.fontDescriptor.withSymbolicTraits(traits) {
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return UIFont.init(descriptor: fontDescriptor, size: 0)
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}
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}
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return newFont
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}
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}
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final class AttributedTextComponent: UIViewRepresentable {
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let string: NSMutableAttributedString
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init(_ string: NSMutableAttributedString) {
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self.string = string
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}
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public func makeUIView(context: UIViewRepresentableContext<AttributedTextComponent>) -> UILabel {
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UILabel()
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}
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func updateUIView(_ uiView: UILabel, context: Context) {
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uiView.backgroundColor = .clear
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uiView.numberOfLines = 0
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uiView.lineBreakMode = .byWordWrapping
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uiView.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
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uiView.attributedText = string
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}
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}
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struct SizeKey: PreferenceKey {
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static var defaultValue: CGSize = .zero
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static func reduce(value: inout CGSize, nextValue: () -> CGSize) {
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value = nextValue()
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}
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}
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struct AttributedText: View {
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let html: NSMutableAttributedString
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let component: AttributedTextComponent
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@State var height: CGFloat = 0.0
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@State var lastSize: CGSize = .zero
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init(_ html: NSMutableAttributedString) {
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self.html = html.with(font: UIFont.preferredFont(forTextStyle: .body))
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self.component = AttributedTextComponent(html)
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}
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func calculateHeight(size: CGSize) {
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let label = UILabel(frame: CGRect(x: 0, y: 0, width: size.width, height: .greatestFiniteMagnitude))
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label.numberOfLines = 0
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label.lineBreakMode = .byWordWrapping
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label.attributedText = self.html
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label.sizeToFit()
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self.height = label.frame.height
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self.lastSize = size
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}
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var body: some View {
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ZStack {
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GeometryReader { geometry in
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Rectangle().fill(Color.clear).preference(key: SizeKey.self, value: geometry.size)
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}.onPreferenceChange(SizeKey.self, perform: { size in
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self.calculateHeight(size: size)
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})
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component
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}
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.frame(minWidth: 0.0, maxWidth: .infinity, minHeight: self.height, maxHeight: self.height)
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.onAppear {
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if self.lastSize != .zero {
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self.calculateHeight(size: self.lastSize)
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}
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}
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}
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}
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