65 lines
1.3 KiB
Swift
65 lines
1.3 KiB
Swift
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//
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// SingleLineUILabelSizer.swift
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// NetNewsWire
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//
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// Created by Brent Simmons on 2/19/18.
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// Copyright © 2018 Ranchero Software. All rights reserved.
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//
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import UIKit
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// Get the size of an UILabel configured with a specific font with a specific size.
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// Uses a cache.
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// Main thready only.
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final class SingleLineUILabelSizer {
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let font: UIFont
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private var cache = [String: CGSize]()
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init(font: UIFont) {
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self.font = font
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}
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func size(for text: String) -> CGSize {
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if let cachedSize = cache[text] {
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return cachedSize
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}
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let height = text.height(withConstrainedWidth: .greatestFiniteMagnitude, font: font)
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let width = text.width(withConstrainedHeight: .greatestFiniteMagnitude, font: font)
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let calculatedSize = CGSize(width: ceil(width), height: ceil(height))
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cache[text] = calculatedSize
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return calculatedSize
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}
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static private var sizers = [UIFont: SingleLineUILabelSizer]()
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static func sizer(for font: UIFont) -> SingleLineUILabelSizer {
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if let cachedSizer = sizers[font] {
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return cachedSizer
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}
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let newSizer = SingleLineUILabelSizer(font: font)
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sizers[font] = newSizer
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return newSizer
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}
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// Use this call. It’s easiest.
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static func size(for text: String, font: UIFont) -> CGSize {
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return sizer(for: font).size(for: text)
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}
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static func emptyCache() {
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sizers = [UIFont: SingleLineUILabelSizer]()
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}
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}
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