iOS でこのシステムフォントが使いたいとか、そもそもどのフォントが内蔵されてるのか知りたいとか、そんな需要たくさんあると思います。
というわけで、全てのシステム内蔵フォントを引っ張り出して iOS 上で描画する一覧アプリを作りました：
https://github.com/el-hoshino/iOSAllFontsDisplayer
まあ実現は非常に簡単です、単純に UIFont.familyNames() と UIFont.fontNamesForFamilyName(_:) の二重ループでラベルを作ってスクロールビューに貼り付けるだけです。そこのソースコードを抽出するとこれだけです：
ViewController
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let view = UIScrollView(frame: self.view.bounds)
view.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
view.contentSize = .zero
UIFont.familyNames().forEach { (familyName) in
let fontsInFamily = UIFont.fontNamesForFamilyName(familyName)
fontsInFamily.forEach({ (fontName) in
print(fontName)
let label = UILabel()
label.text = "フォント：" + fontName
label.font = UIFont(name: fontName, size: UIFont.labelFontSize())
label.sizeToFit()
label.frame.origin.y = view.contentSize.height
view.contentSize.width = max(view.contentSize.width, label.frame.width)
view.contentSize.height += label.frame.height + 10
view.addSubview(label)
})
}
self.view.addSubview(view)
}
まあ実際 iOS 9 の iPhone 5s で実行して取得した一覧はこんな感じ：
Copperplate-Light
Copperplate
Copperplate-Bold
IowanOldStyle-Italic
IowanOldStyle-Roman
IowanOldStyle-BoldItalic
IowanOldStyle-Bold
KohinoorTelugu-Regular
KohinoorTelugu-Medium
KohinoorTelugu-Light
Thonburi
Thonburi-Bold
Thonburi-Light
CourierNewPS-BoldMT
CourierNewPS-ItalicMT
CourierNewPSMT
CourierNewPS-BoldItalicMT
GillSans-Italic
GillSans-Bold
GillSans-BoldItalic
GillSans-LightItalic
GillSans
GillSans-Light
GillSans-SemiBold
GillSans-SemiBoldItalic
GillSans-UltraBold
AppleSDGothicNeo-Bold
AppleSDGothicNeo-Thin
AppleSDGothicNeo-UltraLight
AppleSDGothicNeo-Regular
AppleSDGothicNeo-Light
AppleSDGothicNeo-Medium
AppleSDGothicNeo-SemiBold
MarkerFelt-Thin
MarkerFelt-Wide
AvenirNextCondensed-BoldItalic
AvenirNextCondensed-Heavy
AvenirNextCondensed-Medium
AvenirNextCondensed-Regular
AvenirNextCondensed-HeavyItalic
AvenirNextCondensed-MediumItalic
AvenirNextCondensed-Italic
AvenirNextCondensed-UltraLightItalic
AvenirNextCondensed-UltraLight
AvenirNextCondensed-DemiBold
AvenirNextCondensed-Bold
AvenirNextCondensed-DemiBoldItalic
TamilSangamMN
TamilSangamMN-Bold
HelveticaNeue-Italic
HelveticaNeue-Bold
HelveticaNeue-UltraLight
HelveticaNeue-CondensedBlack
HelveticaNeue-BoldItalic
HelveticaNeue-CondensedBold
HelveticaNeue-Medium
HelveticaNeue-Light
HelveticaNeue-Thin
HelveticaNeue-ThinItalic
HelveticaNeue-LightItalic
HelveticaNeue-UltraLightItalic
HelveticaNeue-MediumItalic
HelveticaNeue
GurmukhiMN-Bold
GurmukhiMN
TimesNewRomanPSMT
TimesNewRomanPS-BoldItalicMT
TimesNewRomanPS-ItalicMT
TimesNewRomanPS-BoldMT
Georgia-BoldItalic
Georgia
Georgia-Italic
Georgia-Bold
AppleColorEmoji
ArialRoundedMTBold
Kailasa-Bold
Kailasa
KohinoorDevanagari-Light
KohinoorDevanagari-Regular
KohinoorDevanagari-Semibold
KohinoorBangla-Semibold
KohinoorBangla-Regular
KohinoorBangla-Light
ChalkboardSE-Bold
ChalkboardSE-Light
ChalkboardSE-Regular
SinhalaSangamMN-Bold
SinhalaSangamMN
PingFangTC-Medium
PingFangTC-Regular
PingFangTC-Light
PingFangTC-Ultralight
PingFangTC-Semibold
PingFangTC-Thin
GujaratiSangamMN-Bold
GujaratiSangamMN
DamascusLight
DamascusBold
DamascusSemiBold
DamascusMedium
Damascus
Noteworthy-Light
Noteworthy-Bold
GeezaPro
GeezaPro-Bold
Avenir-Medium
Avenir-HeavyOblique
Avenir-Book
Avenir-Light
Avenir-Roman
Avenir-BookOblique
Avenir-Black
Avenir-MediumOblique
Avenir-BlackOblique
Avenir-Heavy
Avenir-LightOblique
Avenir-Oblique
AcademyEngravedLetPlain
DiwanMishafi
Futura-CondensedMedium
Futura-CondensedExtraBold
Futura-Medium
Futura-MediumItalic
Farah
KannadaSangamMN
KannadaSangamMN-Bold
ArialHebrew-Bold
ArialHebrew-Light
ArialHebrew
ArialMT
Arial-BoldItalicMT
Arial-BoldMT
Arial-ItalicMT
PartyLetPlain
Chalkduster
HoeflerText-Italic
HoeflerText-Regular
HoeflerText-Black
HoeflerText-BlackItalic
Optima-Regular
Optima-ExtraBlack
Optima-BoldItalic
Optima-Italic
Optima-Bold
Palatino-Bold
Palatino-Roman
Palatino-BoldItalic
Palatino-Italic
LaoSangamMN
MalayalamSangamMN-Bold
MalayalamSangamMN
AlNile-Bold
AlNile
BradleyHandITCTT-Bold
PingFangHK-Ultralight
PingFangHK-Semibold
PingFangHK-Thin
PingFangHK-Light
PingFangHK-Regular
PingFangHK-Medium
Trebuchet-BoldItalic
TrebuchetMS
TrebuchetMS-Bold
TrebuchetMS-Italic
Helvetica-Bold
Helvetica
Helvetica-LightOblique
Helvetica-Oblique
Helvetica-BoldOblique
Helvetica-Light
Courier-BoldOblique
Courier
Courier-Bold
Courier-Oblique
Cochin-Bold
Cochin
Cochin-Italic
Cochin-BoldItalic
HiraMinProN-W6
HiraMinProN-W3
DevanagariSangamMN
DevanagariSangamMN-Bold
OriyaSangamMN
OriyaSangamMN-Bold
SnellRoundhand-Bold
SnellRoundhand
SnellRoundhand-Black
ZapfDingbatsITC
BodoniSvtyTwoITCTT-Bold
BodoniSvtyTwoITCTT-Book
BodoniSvtyTwoITCTT-BookIta
Verdana-Italic
Verdana-BoldItalic
Verdana
Verdana-Bold
AmericanTypewriter-CondensedLight
AmericanTypewriter
AmericanTypewriter-CondensedBold
AmericanTypewriter-Light
AmericanTypewriter-Bold
AmericanTypewriter-Condensed
AvenirNext-UltraLight
AvenirNext-UltraLightItalic
AvenirNext-Bold
AvenirNext-BoldItalic
AvenirNext-DemiBold
AvenirNext-DemiBoldItalic
AvenirNext-Medium
AvenirNext-HeavyItalic
AvenirNext-Heavy
AvenirNext-Italic
AvenirNext-Regular
AvenirNext-MediumItalic
Baskerville-Italic
Baskerville-SemiBold
Baskerville-BoldItalic
Baskerville-SemiBoldItalic
Baskerville-Bold
Baskerville
KhmerSangamMN
Didot-Italic
Didot-Bold
Didot
SavoyeLetPlain
BodoniOrnamentsITCTT
Symbol
Menlo-Italic
Menlo-Bold
Menlo-Regular
Menlo-BoldItalic
BodoniSvtyTwoSCITCTT-Book
Papyrus
Papyrus-Condensed
HiraginoSans-W3
HiraginoSans-W6
PingFangSC-Ultralight
PingFangSC-Regular
PingFangSC-Semibold
PingFangSC-Thin
PingFangSC-Light
PingFangSC-Medium
EuphemiaUCAS-Italic
EuphemiaUCAS
EuphemiaUCAS-Bold
Zapfino
BodoniSvtyTwoOSITCTT-Book
BodoniSvtyTwoOSITCTT-Bold
BodoniSvtyTwoOSITCTT-BookIt
実行画面はこんな感じ：
まあ必要な方どうぞ