2022-09-27 07:17:22 +00:00
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//
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2022-02-02 12:24:22 +00:00
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// Copyright 2021 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import DesignKit
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import SwiftUI
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@available(iOS, introduced: 14.0, deprecated: 15.0, message: "Use Text with an AttributedString instead.")
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/// A `Text` view that renders attributed strings with their `.font` and `.foregroundColor` attributes.
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/// This view is a workaround for iOS 13/14 not supporting `AttributedString`.
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struct StyledText: View {
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// MARK: - Properties
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// MARK: Private
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@Environment(\.theme) private var theme
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/// A string with a bold property.
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private struct StringComponent {
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let string: String
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var font: Font?
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var color: Color?
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}
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/// Internal representation of the string as composable parts.
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private let components: [StringComponent]
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// MARK: - Setup
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/// Creates a `StyledText` using the supplied attributed string.
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/// - Parameter attributedString: The attributed string to display.
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init(_ attributedString: NSAttributedString) {
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var components = [StringComponent]()
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let range = NSRange(location: 0, length: attributedString.length)
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let string = attributedString.string as NSString
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attributedString.enumerateAttributes(in: range, options: []) { attributes, range, _ in
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let font = attributes[.font] as? UIFont
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let color = attributes[.foregroundColor] as? UIColor
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let component = StringComponent(
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string: string.substring(with: range),
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font: font.map { Font($0) },
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color: color.map { Color($0) }
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)
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components.append(component)
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}
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self.components = components
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}
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/// Creates a `StyledText` using a plain string.
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/// - Parameter string: The plain string to display
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init(_ string: String) {
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components = [StringComponent(string: string, font: nil)]
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}
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// MARK: - Views
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var body: some View {
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components.reduce(Text("")) { lastValue, component in
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lastValue + Text(component.string)
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.font(component.font)
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.foregroundColor(component.color)
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}
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}
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}
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struct StyledText_Previews: PreviewProvider {
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static func prettyText() -> NSAttributedString {
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let string = NSMutableAttributedString(string: "T", attributes: [
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.font: UIFont.boldSystemFont(ofSize: 12),
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.foregroundColor: UIColor.red
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])
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string.append(NSAttributedString(string: "e", attributes: [
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.font: UIFont.boldSystemFont(ofSize: 14),
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.foregroundColor: UIColor.orange
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]))
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string.append(NSAttributedString(string: "s", attributes: [
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.font: UIFont.boldSystemFont(ofSize: 13),
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.foregroundColor: UIColor.yellow
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]))
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string.append(NSAttributedString(string: "t", attributes: [
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.font: UIFont.boldSystemFont(ofSize: 15),
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.foregroundColor: UIColor.green
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]))
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string.append(NSAttributedString(string: "i", attributes: [
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.font: UIFont.boldSystemFont(ofSize: 11),
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.foregroundColor: UIColor.cyan
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]))
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string.append(NSAttributedString(string: "n", attributes: [
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.font: UIFont.boldSystemFont(ofSize: 16),
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.foregroundColor: UIColor.blue
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]))
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string.append(NSAttributedString(string: "g", attributes: [
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.font: UIFont.boldSystemFont(ofSize: 14),
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.foregroundColor: UIColor.purple
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]))
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return string
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}
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static var previews: some View {
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VStack(spacing: 8) {
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StyledText("Hello, World!")
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StyledText(NSAttributedString(string: "Testing",
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attributes: [.font: UIFont.boldSystemFont(ofSize: 64)]))
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StyledText(prettyText())
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}
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}
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}
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