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+//
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+// FontSizeCalculator.swift
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+// Nextcloud
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+//
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+// Created by Marino Faggiana on 02/01/23.
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+// Copyright © 2023 Marino Faggiana. All rights reserved.
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+//
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+// Author Marino Faggiana <marino.faggiana@nextcloud.com>
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+//
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+// This program is free software: you can redistribute it and/or modify
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+// it under the terms of the GNU General Public License as published by
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+// the Free Software Foundation, either version 3 of the License, or
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+// (at your option) any later version.
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+//
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+// This program is distributed in the hope that it will be useful,
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+// but WITHOUT ANY WARRANTY; without even the implied warranty of
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+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+// GNU General Public License for more details.
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+//
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+// You should have received a copy of the GNU General Public License
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+// along with this program. If not, see <http://www.gnu.org/licenses/>.
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+//
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+
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+import Foundation
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+import UIKit
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+
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+//
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+// Credits: https://github.com/tbaranes/FittableFontLabel/blob/master/Source/UILabelExtension.swift
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+//
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+
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+public class FontSizeCalculator {
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+
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+ static var shared: FontSizeCalculator = FontSizeCalculator()
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+
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+ private enum FontSizeState {
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+ case fit, tooBig, tooSmall
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+ }
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+
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+ /**
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+ Returns a font size of a specific string in a specific font that fits a specific size
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+ - parameter text: The text to use
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+ - parameter maxFontSize: The max font size available
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+ - parameter minFontScale: The min font scale that the font will have
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+ - parameter rectSize: Rect size where the label must fit
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+ - parameter fontColor: The color of font
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+ */
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+ public func fontSizeThatFits(text string: String, maxFontSize: CGFloat = 100, minFontScale: CGFloat = 0.1, rectSize: CGSize) -> CGFloat {
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+
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+ let font = UIFont.systemFont(ofSize: 10)
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+ let maxFontSize = maxFontSize.isNaN ? 100 : maxFontSize
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+ let minFontScale = minFontScale.isNaN ? 0.1 : minFontScale
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+ let minimumFontSize = maxFontSize * minFontScale
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+ guard !string.isEmpty else {
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+ return font.pointSize
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+ }
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+
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+ let constraintSize = CGSize(width: CGFloat.greatestFiniteMagnitude, height: rectSize.height)
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+ let calculatedFontSize = binarySearch(font: font, string: string, minSize: minimumFontSize, maxSize: maxFontSize, size: rectSize, constraintSize: constraintSize)
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+ return (calculatedFontSize * 10.0).rounded(.down) / 10.0
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+ }
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+
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+ private func binarySearch(font: UIFont, string: String, minSize: CGFloat, maxSize: CGFloat, size: CGSize, constraintSize: CGSize) -> CGFloat {
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+
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+ let fontSize = (minSize + maxSize) / 2
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+ var attributes: [NSAttributedString.Key: Any] = [:]
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+
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+ attributes[NSAttributedString.Key.font] = font.withSize(fontSize)
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+
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+ let rect = string.boundingRect(with: constraintSize, options: .usesLineFragmentOrigin, attributes: attributes, context: nil)
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+ let state = singleLineSizeState(rect: rect, size: size)
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+
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+ // if the search range is smaller than 0.1 of a font size we stop
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+ // returning either side of min or max depending on the state
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+ let diff = maxSize - minSize
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+ guard diff > 0.1 else {
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+ switch state {
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+ case .tooSmall:
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+ return maxSize
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+ default:
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+ return minSize
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+ }
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+ }
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+
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+ switch state {
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+ case .fit: return fontSize
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+ case .tooBig: return binarySearch(font: font, string: string, minSize: minSize, maxSize: fontSize, size: size, constraintSize: constraintSize)
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+ case .tooSmall: return binarySearch(font: font, string: string, minSize: fontSize, maxSize: maxSize, size: size, constraintSize: constraintSize)
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+ }
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+ }
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+
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+ private func singleLineSizeState(rect: CGRect, size: CGSize) -> FontSizeState {
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+
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+ if rect.width >= size.width + 10 && rect.width <= size.width {
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+ return .fit
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+ } else if rect.width > size.width {
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+ return .tooBig
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+ } else {
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+ return .tooSmall
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+ }
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+ }
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+}
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Marino Faggiana