March 2013
Intermediate to advanced
1000 pages
34h 51m
English
Content preview from Programming iOS 6, 3rd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 23. Text
The high-level text classes are NSString and NSAttributedString. Text can be displayed in various ways:
- UILabel
- Displays text, possibly consisting of multiple lines; neither scrollable nor editable.
- UITextField
- Displays a single line of editable text; may have a border, a background image, and overlay views at its right and left end.
- UITextView
- Displays scrollable text, possibly editable; can use data detectors to display tappable links.
- UIWebView
- A scrollable view displaying rendered HTML. A good way to show text that includes images and tappable links. Can also display various additional document types, such as PDF, RTF, and .doc. Discussed in Chapter 24.
- Drawing
There are three main ways to draw text directly:
- Core Graphics
- Low-level methods for drawing text (not NSStrings). For drawing in general, see Chapter 15.
- NSString and NSAttributedString
- At a high level, the UIStringDrawing category on NSString and the NSStringDrawing category on NSAttributedString endow strings with the ability to draw themselves, along with metrics methods for learning the dimensions at which a given string will be drawn. Some examples have appeared already in Chapter 12 and Chapter 20.
- Core Text
- The underlying low-level technology behind all string drawing on iOS. Also provides access to advanced font typographical features.
Note
An app can include fonts within its bundle; these will be loaded at launch time if the app lists them in its Info.plist under the “Fonts provided ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.