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Handling rich text in Swift
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Kishikawa Katsumi
August 20, 2016
Programming
17
6.3k
Handling rich text in Swift
Handling rich text
in Swift
iOSDC Japan 2016
Kishikawa Katsumi
August 20, 2016
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Transcript
Handling rich text in Swift iOSDC Japan 2016 Katsumi Kishikawa
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Katsumi Kishikawa Realm Inc.
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Agenda ˖ J04ךذؗأزٖ؎،ؐزחאְג ˖ ة؎هؚٓؿ؍ך㛇燉 ˖ 5FYU,JUך㛇燉ה䘔欽
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iOS 7Ҏ߱ͷςΩετϨΠΞτ
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TextKit
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TextKitͱ ˖ 넝鸞זٌتٝذؗأزٖ؎،ؐز٥ٖٝت ؚٔٝؒٝآٝ ˖ $PSF5FYUד⡲גְ ˖ 6*,JUהך窟さ
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https://developer.apple.com/library/ios/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/CustomTextProcessing/CustomTextProcessing.html
UILabel
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UILabelΛී௨ʹ͏
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ώϥΪϊͱγεςϜϑΥϯτ UIFont(name: "HiraginoSans-W3", size: 32) UIFont.systemFontOfSize(32)
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ώϥΪϊͱγεςϜϑΥϯτ
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ώϥΪϊͱγεςϜϑΥϯτ
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General Header
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ΞϧϑΝϕοτΛؚ·ͳ͍߹
ߦͷߴ͞ԿͰܾ·Δ͔
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Font metrics https://developer.apple.com/library/mac/documentation/TextFonts/Conceptual/CocoaTextArchitecture/FontHandling/FontHandling.html
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Font metrics https://developer.apple.com/library/mac/documentation/TextFonts/Conceptual/CocoaTextArchitecture/FontHandling/FontHandling.html
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Font metrics
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Font metrics Baseline X-Height Cap height Ascent Descent
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ώϥΪϊಛघͳϝτϦΫεΛ࣋ͭ
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ʢࢀߟʣNoto Sans CJK JP
let label = UILabel(frame: view.bounds) label.backgroundColor = ... label.textColor =
... label.font = ... label.text = text ... label.sizeToFit() label.frame.size.height += ceil(abs(label.font.descender * 2))
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্ԼʹDescentΛิ͏
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্ԼʹDescentΛิ͏
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্ԼʹDescentΛิ͏
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ΦϦδφϧͱൺֱ
• ώϥΪϊΛ໌ࣔతʹࢦఆ͠ͳ͍ • γεςϜϑΥϯτΛ͏ • σβΠϯࢦࣔॻͳͲͰɺώϥΪϊ͍͍ͨͯγε ςϜϑΥϯτΛҙਤ͍ͯ͠Δͣ • தࠃޠ༻ϑΥϯτʹϑΥʔϧόοΫͨ͘͠ͳ͍Մ ೳੑ
• ώϥΪϊΛࢦఆ͢Δ߹ɺΞϧϑΝϕοτʹؾΛ ͚ͭΔ
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ώϥΪϊͷϝτϦΫεʹҙ
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Tips: ຊޠϑΥϯτʹϑΥʔϧόοΫͤ͞Δ let attributes = [ NSFontAttributeName: font, kCTLanguageAttributeName
as String: "ja", ... ]
αΠζͷܭࢉ
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let size = CGSize(width: label.bounds.width, height: CGFloat.max) let boundingRect =
NSString(string: text).boundingRectWithSize(size, options: [.UsesLineFragmentOrigin], attributes: [NSFontAttributeName: font], context: nil)
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ඳըαΠζΛಘΔ
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ඳըαΠζΛಘΔ
UITextView
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UITextViewΛී௨ʹ͏
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UITextViewΛී௨ʹ͏ UIFont(name: "HiraginoSans-W3", size: 32) UIFont.systemFontOfSize(32)
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ඳըαΠζ
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ඳըαΠζ
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σϑΥϧτͷϚʔδϯ
σϑΥϧτͷϚʔδϯ textView.textContainer.lineFragmentPadding textView.textContainerInset UIEdgeInsets(top: 8.0, left: 0.0, bottom: 8.0, right:
0.0) 5.0
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ώϥΪϊΛࢦఆͨ͠߹ font.leading
σϑΥϧτͷελΠϧΛϦηοτ͢Δ
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let textView = UITextView(frame: view.bounds) ... textView.textContainerInset = UIEdgeInsetsZero textView.sizeToFit()
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textContainerInsetΛऔΓআ͘
let textView = UITextView(frame: view.bounds) ... textView.textContainerInset = UIEdgeInsetsZero textView.sizeToFit()
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textContainerInsetΛऔΓআ͘
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textContainerInsetΛऔΓআ͘
let textView = UITextView(frame: view.bounds) ... textView.textContainer.lineFragmentPadding = 0 textView.sizeToFit()
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lineFragmentPaddingΛऔΓআ͘
let textView = UITextView(frame: view.bounds) ... textView.textContainer.lineFragmentPadding = 0 textView.sizeToFit()
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lineFragmentPaddingΛऔΓআ͘
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lineFragmentPaddingΛऔΓআ͘
let size = CGSize(width: textView.bounds.width, height: CGFloat.max) let boundingRect =
NSString(string: text).boundingRectWithSize(size, options: [.UsesLineFragmentOrigin], attributes: [NSFontAttributeName: font], context: nil)
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ඳըαΠζΛಘΔ
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ඳըαΠζΛಘΔ
let textView = UITextView(frame: view.bounds) ... textView.layoutManager.usesFontLeading = false textView.sizeToFit()
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font.leadingΛऔΓআ͘
let textView = UITextView(frame: view.bounds) ... textView.layoutManager.usesFontLeading = false textView.sizeToFit()
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font.leadingΛऔΓআ͘
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font.leadingΛऔΓআ͘
let size = CGSize(width: textView.bounds.width, height: CGFloat.max) let boundingRect =
NSString(string: text).boundingRectWithSize(size, options: [.UsesLineFragmentOrigin, .UsesFontLeading], attributes: [NSFontAttributeName: font], context: nil)
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ʢผղʣfont.leadingΛؚΊͯܭࢉ͢Δ
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ʢผղʣfont.leadingΛؚΊͯܭࢉ͢Δ
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ʢผղʣfont.leadingΛؚΊͯܭࢉ͢Δ
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textView.textContainerInset = UIEdgeInsetsZero textView.textContainer.lineFragmentPadding = 0 textView.layoutManager.usesFontLeading = false
σϑΥϧτελΠϧͷϦηοτ
͞·͟·ͳελΠϧʹରԠ͢Δ
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ߦؒͷมߋ
NSAttributedString
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NSParagraphStyle
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let paragraphStyle = NSMutableParagraphStyle() paragraphStyle.minimumLineHeight = ceil(font.lineHeight) paragraphStyle.maximumLineHeight = ceil(font.lineHeight)
paragraphStyle.lineSpacing = 8 let attributes = [ NSFontAttributeName: font, NSForegroundColorAttributeName: UIColor(...), NSParagraphStyleAttributeName: paragraphStyle, ] let attributedText = NSAttributedString(string: text, attributes: attributes) textView.attributedText = attributedText
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NSAttributedString
let paragraphStyle = NSMutableParagraphStyle() paragraphStyle.minimumLineHeight = ceil(font.lineHeight) paragraphStyle.maximumLineHeight = ceil(font.lineHeight)
paragraphStyle.lineSpacing = 8 let attributes = [ NSFontAttributeName: font, NSForegroundColorAttributeName: UIColor(...), NSParagraphStyleAttributeName: paragraphStyle, ] let attributedText = NSAttributedString(string: text, attributes: attributes) textView.attributedText = attributedText
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NSAttributedString
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ߦؒͷมߋ
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ߦؒͷมߋ
let paragraphStyle = NSMutableParagraphStyle() paragraphStyle.minimumLineHeight = ceil(font.lineHeight) paragraphStyle.maximumLineHeight = ceil(font.lineHeight)
paragraphStyle.lineSpacing = 8
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min/maxLineHeight
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min/maxLineHeight
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minimumLineHeight
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maximumLineHeight
NSAttributedStringΛ׆༻͢Δ
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͞ΒʹߦؒΛ͘
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͞ΒʹߦؒΛ͘
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Օॻ͖
·ͱΊ • iOS 7Ҏ߱ͷςΩετϨΠΞτɺ͍͔ʹ ΩϨΠͳNSAttributedStringΛ࡞Δ͔ • λΠϙάϥϑΟͷجૅΛΖ͏ • ϑΥϯτʹώϥΪϊΛࢦఆ͢Δͱ͖ҙ •
Ͱ͖Δ͚ͩγεςϜϑΥϯτΛ͓͏
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Questions? Katsuma Kishikawa
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www.realm.io/jp @k_katsumi