Tusker/Tusker/Extensions/NSTextAttachment+Emoji.swift

38 lines
1.5 KiB
Swift

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