ITT 2014 - Max Seelemann - Hello TextKit!

Max presents TextKit - probably the most significant recent addition to UIKit. iOS 7’s new interface replaces icons and bezels with text, all of which is now driven by the new framework. Max will cover how TextKit came to be, what it’s all about, and, by means of a couple of examples, how things that took weeks before can now be solved in a few lines of code.

Transcript

1. Hello TextKit! Max Seelemann – The Soulmen – @macguru17
3. • General Architecture • Syntax Highlighting • Paragraph Numbers
4. General Architecture
5. UITextView NSTextStorage Text User Model View Controller NSLayoutManager iOS 7 iOS 7 NSTextContainer iOS 7 iOS 2 Store Text Control Layout Define Text Area Display + Input
6. UITextView NSTextStorage NSLayoutManager NSTextContainer textStorage = [NSTextStorage new]; 1 layoutManager = [NSLayoutManager new];! [textStorage addLayoutManager: layoutManager]; 2 textContainer = [[NSTextContainer alloc] initWithSize:CGSizeMake(…, …)];! [layoutManager addTextContainer: textContainer]; 3 textView = [[UITextView alloc] initWithFrame:… textContainer:textContainer]; 4
7. Syntax Highlighting
8. Comments Pragmas Keywords
9. NSTextStorage Store Text NSTextContainer Define Text Area Model NSLayoutManager Control Layout Controller UITextView Display + Input View
10. NSTextStorage Store Text + Attributes
11. Class Cluster TKETextStorage NSTextStorage Abstract - string! - attributesAtIndex:effectiveRange:! ! - replaceCharactersInRange:withString:! - setAttributes:range: NSAttributedString storage
12. Simple Text Storage TKETextStorage NSAttributedString storage - (NSString *)string { return [storage string]; } - (NSDictionary *)attributesAtIndex:(NSUInteger)location effectiveRange:(NSRangePointer)range { return [storage attributesAtIndex:location effectiveRange:range]; } - (id)init { self = [super init]; ! if (self) { storage = [NSMutableAttributedString new]; } return self; }
13. Simple Text Storage - (void)setAttributes:(NSDictionary *)attrs range:(NSRange)range { [storage setAttributes:attrs range:range]; ! } - (void)replaceCharactersInRange:(NSRange)range withString:(NSString *)str { [storage replaceCharactersInRange:range withString:str]; ! ! ! } [self edited:NSTextStorageEditedCharacters range:range changeInLength:(NSInteger)str.length - (NSInteger)range.length]; [self edited:NSTextStorageEditedAttributes range:range changeInLength:0];
15. Code Text Storage TKETextStorage - string! - attributesAtIndex:effectiveRange:! ! - replaceCharactersInRange:withString:! - setAttributes:range: Text / Code Attributes TKECodeString storage NSAttributedString cache
16. Code Text Storage - (void)setAttributes:(NSDictionary *)attrs range:(NSRange)range { [cache setAttributes:attrs range:range]; ! [self edited:NSTextStorageEditedAttributes range:range changeInLength:0]; } - (void)replaceCharactersInRange:(NSRange)range withString:(NSString *)str { [storage replaceCharactersInRange:range withString:str]; [cache replaceCharactersInRange:range withString:str]; ! [self edited:NSTextStorageEditedCharacters range:range changeInLength:(NSInteger)str.length - (NSInteger)range.length]; }
17. Text Storage Mutation -beginEditing -endEditing -processEditing -replaceCharactersInRange:… All textual changes done -replaceCharactersInRange:… Compute colors Notify Change
18. Compute Colors - (void)processEditing { ... // Clean up colors ! ! [self.content enumerateCodeInRange:range usingBlock:^(NSRange range, TKECodeType type) { ! [self addAttribute:NSForegroundColorAttributeName value:[self textColorForCodeType: type] range:range]; ! }]; ! [super processEditing]; } CodeString knows code TextStorage maps colors
20. Paragraph Numbers
24. NSTextContainer Define Text Area NSTextStorage Store Text Model NSLayoutManager Control Layout Controller UITextView Display + Input View
25. NSTextContainer Define Text Area
26. NSTextContainer Vivamus et turpis in dui blandit pulvinar nec dignissim diam. Nulla scelerisque posuere viverra. Quisque nibh nunc, consequat vel luctus in, consectetur vitae mauris. Nunc lacinia malesuada mauris, sed egestas nunc fermentum nec. Suspendisse potenti. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Vestibulum enim. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Phasellus hendrerit venenatis libero, vitae sodales lacus elementum eget. Duis sit amet risus ac nunc blandit lobortis vel sed nibh. Suspendisse laoreet odio ac ligula aliquam scelerisque. Nulla volutpat consectetur sem tincidunt cursus. In ac justo in libero. Fusce tincidunt erat sit amet magna porttitor nec iaculis diam varius. Aliquam eget odio leo. Sed faucibus, libero non consectetur tristique, metus leo tempus libero, quis ornare felis purus in odio. Proin metus arcu, dictum id faucibus gravida, pulvinar ut metus. Mauris nisl sapien, cursus nec auctor quis, bibendum vitae. Etiam id nisl libero, nec consequat dolor. Fusce id ornare enim. Praesent viverra rutrum erat, eu gravida erat scelerisque at. Donec sed lectus leo. Nunc vel volutpat libero. Maecenas euismod molestie neque non feugiat. Vestibulum hendrerit lorem leo, condimentum imperdiet velit. Quisque urna nisi, faucibus id Vivamus et turpis in dui blandit pulvinar nec dignissim diam. Nulla scelerisque posuere viverra. Quisque nibh nunc, consequat vel luctus in, consectetur vitae mauris. Nunc lacinia malesuada mauris, sed egestas nunc fermentum nec. Suspendisse potenti. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Vestibulum enim. Cum sociis natoque penatibus et magnis dis p a r t u r i e n t montes, nascetur r i d i c u l u s m u s . P h a s e l l u s hendrerit venenatis libero, v i t a e s o d a l e s l a c u s elementum eget. Duis sit amet risus ac nunc b l a n d i t lobortis vel sed nibh. Suspendisse laoreet o d i o a c ligula aliquam scelerisque. Nulla volutpat consectetur sem tincidunt cursus. In ac justo in libero. Fusce tincidunt erat sit amet magna porttitor nec iaculis diam varius. Aliquam eget odio leo. Sed faucibus, libero non consectetur tristique, metus leo tempus libero, quis ornare felis purus in odio. Proin metus arcu, dictum id faucibus gravida, pulvinar ut metus. Mauris nisl sapien, cursus nec auctor quis, bibendum vitae. Etiam id nisl libero, nec consequat dolor. Fusce id ornare enim. Praesent viverra rutrum erat, eu gravida erat scelerisque at. Donec sed Vivamus et turpis in dui blandit pulvinar nec dignissim diam. Nulla scelerisque posuere viverra. Quisque nibh nunc, c o n s e q u a t v e l l u c t u s i n , consectetur vitae mauris. Nunc lacinia malesuada mauris, sed egestas nunc fermentum nec. S u s p e n d i s s e p o t e n t i . Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Vestibulum enim. C u m s o c i i s n a t o q u e penatibus et magnis dis parturient montes, nascetur ridiculus mus. Phasellus hendrerit venenatis libero, v i t a e s o d a l e s l a c u s elementum eget. Duis sit amet risus ac nunc blandit l o b o r t i s v e l s e d n i b h . Suspendisse laoreet odio ac ligula aliquam scelerisque. Nulla volutpat consectetur sem tincidunt cursus. In ac justo in libero. Fusce tincidunt erat sit amet magna porttitor nec iaculis diam varius. Aliquam eget odio leo. Sed faucibus, Vivamus et turpis in dui blandit pulvinar nec dignissim diam. Nulla scelerisque posuere viverra. Quisque nibh nunc, consequat vel luctus in, consectetur vitae mauris. Nunc lacinia malesuada mauris, sed egestas nunc fermentum nec. Suspendisse potenti. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Vestibulum enim. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Phasellus hendrerit venenatis libero, vitae sodales lacus elementum eget. Duis sit amet risus ac nunc blandit lobortis vel sed nibh. Suspendisse laoreet odio ac ligula aliquam scelerisque. Nulla volutpat consectetur sem tincidunt cursus. In ac justo in libero. Fusce tincidunt erat sit amet magna porttitor nec iaculis diam varius. Aliquam eget odio leo. Sed faucibus, libero non consectetur tristique, metus leo tempus libero, quis ornare felis purus in odio. Proin metus arcu, dictum id faucibus gravida, pulvinar ut metus. Mauris nisl sapien, cursus nec auctor quis, bibendum vitae. Define Text Area
27. Line Fragment Rect - (CGRect)lineFragmentRectForProposedRect:(CGRect)proposedRect atIndex:(NSUInteger)characterIndex writingDirection:(NSWritingDirection)baseWritingDirection remainingRect:(CGRect *)remainingRect
28. Insetting Text Container - (CGRect)lineFragmentRectForProposedRect:(CGRect)proposedRect atIndex:(NSUInteger)characterIndex writingDirection:(NSWritingDirection)baseWritingDirection remainingRect:(CGRect *)remainingRect { CGRect rect = [super lineFragmentRectForProposedRect:proposedRect atIndex:characterIndex writingDirection:baseWritingDirection remainingRect:remainingRect]; ! rect.origin.x += inset; rect.size.width -= inset; ! return rect; }
29. Insetting Text Container - (CGRect)lineFragmentRectForProposedRect:(CGRect)proposedRect atIndex:(NSUInteger)characterIndex writingDirection:(NSWritingDirection)baseWritingDirection remainingRect:(CGRect *)remainingRect { CGRect rect = [super lineFragmentRectForProposedRect:proposedRect atIndex:characterIndex writingDirection:baseWritingDirection remainingRect:remainingRect]; ! rect.origin.x += inset; rect.size.width -= inset; ! return rect; } Hangs the text layout
30. NSTextContainer NSTextStorage NSLayoutManager Control Layout UITextView
31. NSTextContainer NSTextStorage NSLayoutManager UITextView Store Layout
32. NSTextContainer NSTextStorage NSLayoutManager UITextView NSGlyphGenerator NSTypesetter Create Layout Store Layout
33. NSTextContainer NSTextStorage NSLayoutManager UITextView NSGlyphGenerator NSTypesetter Create Layout Store Layout NSLayoutManager Delegate
34. NSTextContainer NSTextStorage NSLayoutManager UITextView NSGlyphGenerator NSTypesetter Create Layout Control Layout NSLayoutManager Delegate
35. Typesetting View (UITextContainer) Text (NSTextStorage) (NSTypesetter) Vivamus et turpis in dui blandit pulvinar nec dignissim diam. Nulla scelerisque posuere viverra. Quisque nibh nunc, consequat vel luctus in, consectetur vitae mauris. Nunc lacinia malesuada mauris, sed egestas nunc fermentum nec. Suspendisse potenti. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere Line Fragment Rect Characters to Glyphs A → A Text Attributes Store Layout (NSLayoutManager) Test in Istanbul
36. Typesetting View (UITextContainer) Text (NSTextStorage) (NSTypesetter) Vivamus et turpis in dui blandit pulvinar nec dignissim diam. Nulla scelerisque posuere viverra. Quisque nibh nunc, consequat vel luctus in, consectetur vitae mauris. Nunc lacinia malesuada mauris, sed egestas nunc fermentum nec. Suspendisse potenti. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere Line Fragment Rect Characters to Glyphs A → A Text Attributes Store Layout (NSLayoutManager) Test in Istanbul Shorten Line Offset Line
37. Offsetting Line Fragment - (void)setLineFragmentRect:(CGRect)fragmentRect forGlyphRange:(NSRange)glyphRange usedRect:(CGRect)usedRect { fragmentRect.origin.x += inset; usedRect.origin.x += inset; [super setLineFragmentRect:fragmentRect forGlyphRange:glyphRange usedRect:usedRect]; }
38. Paragraph numbers - (void)drawBackgroundForGlyphRange:(NSRange)glyphsToShow atPoint:(CGPoint)origin { [super drawBackgroundForGlyphRange:glyphsToShow atPoint:origin]; ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! } // Enumerate all lines NSUInteger glyphIndex = glyphRange.location; while (glyphIndex < NSMaxRange(glyphRange)) { ! ! ! ! ! ! ! ! // Advance glyphIndex = NSMaxRange(glyphLineRange); } NSRange glyphLineRange; CGRect lineRect = [self lineFragmentRectForGlyphAtIndex:glyphIndex effectiveRange:&glyphLineRange]; ! // Drawing ...
40. Demo
41. • Indented Line Wrap • Dynamic Line Height • Dynamic Tab Size github.com/macguru/TextKitEditor TextKitEditor on GitHub Max Seelemann – @macguru17