回答編集履歴
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answer
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@@ -1,3 +1,115 @@
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以下のサイトは`Swift2`ではありますがやりたいことと同じだと思います、参考になるのではないでしょうか。
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[ルビを振る](http://qiita.com/woxtu/items/284369fd2654edac2248)
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[ルビを振る](http://qiita.com/woxtu/items/284369fd2654edac2248)
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`Swift3`で動かしてみました。
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```swift
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import UIKit
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extension String {
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func find(pattern: String) -> NSTextCheckingResult? {
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do {
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let re = try NSRegularExpression(pattern: pattern, options: [])
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return re.firstMatch(
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in: self,
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options: [],
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range: NSMakeRange(0, self.utf16.count))
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} catch {
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return nil
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}
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}
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func replace(pattern: String, template: String) -> String {
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do {
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let re = try NSRegularExpression(pattern: pattern, options: [])
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return re.stringByReplacingMatches(
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in: self,
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options: [],
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range: NSMakeRange(0, self.utf16.count),
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withTemplate: template)
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} catch {
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return self
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}
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}
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}
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class View: UIView {
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override func draw(_ rect: CGRect) {
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let text = [
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"「まさか、｜後罪《クライム》の｜触媒《カタリスト》を〈｜讃来歌《オラトリオ》〉無しで？」",
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"教師たちの狼狽した声が次々と上がる。",
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"……なんでだろう。何を驚いているんだろう。",
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"ただ普通に、この｜触媒《カタリスト》を使って｜名詠門《チャネル》を開かせただけなのに。",
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"そう言えば、何を｜詠《よ》ぼう。",
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"自分の一番好きな花でいいかな。",
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"どんな宝石より素敵な、わたしの大好きな緋色の花。",
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"――『｜Keinez《赤》』――",
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"そして、少女の口ずさんだその後に――",
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]
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.joined(separator: "\n")
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let attributed =
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text
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.replace(pattern: "(｜.+?《.+?》)", template: ",$1,")
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.components(separatedBy: ",")
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.map { x -> NSAttributedString in
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if let pair = x.find(pattern: "｜(.+?)《(.+?)》") {
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let string = (x as NSString).substring(with: pair.rangeAt(1))
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let ruby = (x as NSString).substring(with: pair.rangeAt(2))
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var text: [Unmanaged<CFString>?] = [Unmanaged<CFString>.passRetained(ruby as CFString) as Unmanaged<CFString>, .none, .none, .none]
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let annotation = CTRubyAnnotationCreate(.auto, .auto, 0.5, &text[0]!)
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return NSAttributedString(
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string: string,
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attributes: [kCTRubyAnnotationAttributeName as String: annotation])
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} else {
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return NSAttributedString(string: x, attributes: nil)
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}
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}
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.reduce(NSMutableAttributedString()) { $0.append($1); return $0 }
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var height = 28.0
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let settings = [
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CTParagraphStyleSetting(
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spec: .minimumLineHeight,
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valueSize: Int(MemoryLayout.size(ofValue: height)),
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value: &height)
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]
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let style = CTParagraphStyleCreate(settings, Int(settings.count))
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attributed.addAttributes([
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NSFontAttributeName: UIFont(name: "HiraMinProN-W3", size: 14.0)!,
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NSVerticalGlyphFormAttributeName: true,
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kCTParagraphStyleAttributeName as String: style,
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],
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range: NSMakeRange(0, attributed.length))
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let context = UIGraphicsGetCurrentContext()
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context!.setFillColor(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
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context!.addRect(rect)
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context?.fillPath()
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context!.rotate(by: CGFloat(M_PI_2))
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context!.translateBy(x: 30.0, y: 35.0)
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context!.scaleBy(x: 1.0, y: -1.0)
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let framesetter = CTFramesetterCreateWithAttributedString(attributed)
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let path = CGPath(rect: CGRect(x: 0.0, y: 0.0, width: rect.height, height: rect.width), transform: nil)
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let frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), path, nil)
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CTFrameDraw(frame, context!)
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}
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}
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class ViewController: UIViewController {
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override func loadView() {
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super.loadView()
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self.view = View()
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}
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}
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```
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