38 lines
1.5 KiB
Swift
38 lines
1.5 KiB
Swift
//
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// NSTextAttachment+Emoji.swift
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// Tusker
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//
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// Created by Shadowfacts on 3/1/20.
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// Copyright © 2020 Shadowfacts. All rights reserved.
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//
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import UIKit
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extension NSTextAttachment {
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// Based on https://github.com/ReticentJohn/Amaroq/blob/7c5b7088eb9fd1611dcb0f47d43bf8df093e142c/DireFloof/InlineImageHelpers.m
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convenience init(emojiImage image: UIImage, in font: UIFont, with textColor: UIColor = .label) {
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let adjustedCapHeight = font.capHeight - 1
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var imageSizeMatchingFontSize = CGSize(width: image.size.width * (adjustedCapHeight / image.size.height), height: adjustedCapHeight)
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let defaultScale: CGFloat = 1.4
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imageSizeMatchingFontSize = CGSize(width: imageSizeMatchingFontSize.width * defaultScale, height: imageSizeMatchingFontSize.height * defaultScale)
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let attachmentImage = UIGraphicsImageRenderer(size: imageSizeMatchingFontSize).image { (_) in
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textColor.set()
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image.draw(in: CGRect(origin: .zero, size: imageSizeMatchingFontSize))
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}
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self.init()
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self.image = attachmentImage
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}
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convenience init(emojiPlaceholderIn font: UIFont) {
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let adjustedCapHeight = font.capHeight - 1
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// assumes emoji are mostly square
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let size = CGSize(width: adjustedCapHeight, height: adjustedCapHeight)
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let image = UIGraphicsImageRenderer(size: size).image { (_) in }
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self.init()
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self.image = image
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}
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}
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