This tutorial will show you how to convert html using nsattributedstring. Swift is apples new programming language introduced in xcode 6 and ios 8 sdk. Normal strings have no character or paragraph formatting. An association of characters and their attributes is called an attributed string. Instead it provides a quick, effient and lightweight implementation for leveraging attributed strings when utilizing native uikit interface elements.
Transform html into an attributed string nsattributedstring stringwithhtmlattributes nsattributedstring alloc. Key the value of this attribute is an nsnumber object containing a boolean. Although nsattributedstring was with us since ios 5, it was limited to few attributes. Underling a string only works when the range starts from zero. Create nsattributedstring out of nsstring with markdownlike. 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. Following additions to the ios 7 nsattributedstring class it is now possible to create attributed strings using html. Titles of full works like books or newspapers should be italicized. After searching a bit more i stumbled upon an article that referenced further. How to easily present strings with bold text and links in cocoa. In order to write apps for ios, you need to know some of the basics of the swift programming language that we will use throughout this book. Very simple nsdocument example of creating and reading a plain text file using objectivec.
Titles of books that form a larger body of work may be put in quotation marks if the name of the book series is italicized. You can check a couple of posts about this topic here and here. Creating an nsattributedstring object initwithstring. Ctstringattributesunderlinestylevalue ctunderlinestyle. You can set the attributed string source, and then add url and different font ranges to the attributed. Simple example of using nsdocument and nsattributedstring to read and write plain text files in objectivec using cocoa library on mac os 10. Nsobject overview an nsattributed string object manages character strings and associated sets of attributes for example, font and kerning that apply to individual characters or ranges of characters in the string. Apr 04, 2017 if you bold by changing the nsfontattributename youll have to specify the font face. How to manipulate nsattributedstring xamarin community. How to apply bold and italics to an nsmutableattributedstring range. Core text still remains the way to go for some specific cases that we will see later but nsattributedstring brings less hassle so, if possible, you should adopt it as a your first option.
The html translation is imperfect and misses some elements of the original, in particular all the margin notes. Nsattributedstring foundation apple developer documentation. Those methods exist on mac but have not been ported publicly to ios. I looked at the source code for label renderer in ios and figured out its actually of type nsmutableattributedstring so i first casted label. An nsattributedstring object manages character strings and associated sets of attributes for example, font and kerning that apply to individual characters or ranges of characters in the string.
This value indicates whether the text is underlined and corresponds to one of the constants described in. Set text underline, paragraph styles and glyph form part 2 in part 1 of working with attributed strings in ios 6 i covered how to use foreground and background colors, specify a preferred font, create character strikethrough and show a shadow on text. This text is taken from chapter 22 of the book objectoriented software construction, second edition, prentice hall, 1997. These are used in various places in ios and macos, but youre most likely to want to use them with uilabel and uitextview, both of which accept attributed strings directly.
Using enumerating over attributes in a string and underline part of. The following are top voted examples for showing how to use java. Core graphics lowlevel methods for drawing text not nsstrings. For a list of available options to pass to any of these methods please refer to dthtmlattributedstringbuilder initwithhtml. I still use it today and will continue to use it until its officially switched off on march 31st. By convert html using nsattributedstring, i mean converting html tags and creating an attributed string from it. Sep 20, 2012 core text still remains as a useful api to do some particular things like writing inside nonrectangular shapes, for example, but lets see the new features of nsattributedstring. Question how do i add a line break in a uitextview. I created a custom menu called subtopnav and now id like to override the html output. Have you ever needed to present something like this in your cocoa ui. These examples are extracted from open source projects. Jun 19, 2017 this tutorial will show you how to convert html using nsattributedstring. Attributed strings are strings with formatting attached, which means fonts, colors, alignment, line spacing and more.
How to manipulate nsattributedstring xamarin community forums. Transform html into an attributed string nsattributedstring stringwithhtmlattributes. How to convert html using nsattributedstring swift2go medium. Create an nsurl pointing to the html file nsurl htmlstring nsbundle mainbundle urlforresource.
I have only found out how to underline the text, but would like to strikethrough as well. Core text still remains as a useful api to do some particular things like writing inside nonrectangular shapes, for example, but lets see the new features of nsattributedstring. If the texts are vertically aligned, then no italicsslanted fonts will be used, be it either traditional or simplified chinese. Objectivec notes for professionals notes for professionals free programming books disclaimer this is an uno cial free book created for educational purposes and is not a liated with o cial objectivec groups or companys. Array of int representing the nested levels of writing direction overrides as defined by unicode lre, rle, lro, and rlo characters. In particular i would like to add an unique class to each item like. How do i convert nsattributedstring into html string. If you dont want to change the font face, use the nsstrokewidthattributename with a negative value. Swifts strings are great for storing plain text, but as soon as you want formatting, images, or interactivity you need to reach for nsattributedstring foundations allinone string handling class. That could work even if you will have to determine which characters to remove at what offset does the text gets troncated well thats the easiers part and how much thats more complicated depending on the font and size at the truncation point 3 letters i in plain text wont be enough but 3 w in bold will be too much, and especially if the trunction happens in the middle of a. How to underline part of string with nsattributedstring.
Key static let uses screen fonts document attribute. Simple nsdocument example of creating and reading a plain. But essentially, in objective c you need to use mutable types to be able to modify the objects. The dictionary is called a style book as the intention is for it to contain all of the application fonts, colours etc in a single place. Used for text rendering by the guiappkit framework, in which fonts, sizes, etc. How to easily present strings with bold text and links in. Like nsstring objects, there are two variations, nsattributedstring and nsmutableattributedstring. Im working in a ios project and ive got this html text that i need to display in a.
Create nsattributedstring out of nsstring with markdownlike syntax for bold text and links. Jun 21, 2016 if the texts are vertically aligned, then no italicsslanted fonts will be used, be it either traditional or simplified chinese. Formatting strings with nsattributedstring a free hacking with swift. Nsmutableattributedstring attributedstring nsmutableattributedstring alloc initwithstring. Attributedtext to the mutable type then i could manipulate it. If you bold by changing the nsfontattributename youll have to specify the font face. Returns an nsattributedstring object initialized with the characters of a given string and no attribute information. Dec 05, 2012 ios 6 nsattributedstring, set text font, foreground and background colors, strikethrough and shadow part 1 attributed strings make an association between characters and their attributes. The control characters can be obtained by masking nswritingdirection and nswritingdirectionformattype values. They are supported in many places around ios, which means you can assign a fully formatted string to a uilabel and have it look great with no further work.
Links will appear blue and underlined by default, but you can set the. A string in which namevalue pairs represented by an nsdictionary may be associated to ranges of characters. Methods for generating an nsattributedstring from html data. The most native way to do this in cocoa is with nsattributedstring. Uilabel text underlining underlining a text in uilabel using swift. Titles of short works like poems, articles, short stories, or chapters should be put in quotation marks. For the horizontal aligned texts, slanted fonts can be used for citations or dialogues. General join an array of strings into a single string nsarray chunks. Both android and ios allow you to display formatted text by annotating ranges of a string with specific formatting like bold or colored text nsattributedstring on ios, spannablestring on android. Bold part of an nsattributedstring without changing the font.
943 1481 621 38 319 258 254 627 41 415 1567 243 539 272 183 684 147 1138 598 965 204 34 1054 119 1499 286 1233 612 448 1484