Prestyler is a text styling library which is based on original NSAttributedString class. It simplifies and extends original workflow, giving you more clean and short syntax. You can find full documentation here. Please check it out and leave your feedback!

Prestyler allows you to replace this code

let baseString = "It is a pain to use attributed strings in ios."
let attributedString = NSMutableAttributedString(string: baseString, attributes: nil)
let painWord = (attributedString.string as NSString).range(of: "pain")
let attributes: [NSAttributedStringKey : Any] = [
    NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 18),
    NSAttributedStringKey.underlineStyle : 2,
    NSAttributedStringKey.foregroundColor : UIColor.red]
attributedString.setAttributes(attributes, range: painWord)
label.attributedText = attributedString

Prestyler.defineRule("$", Prestyle.bold, Prestyle.underline, UIColor.red)
label.attributedText = "Prestyler does $everything$ for you.".prestyled()

Requirements and installation

iOS 9.0+
Xcode 10.0+
Swift 4.2+

CocoaPods is a dependency manager for Cocoa projects. To install Prestyler simply add the following line to your Podfile:

pod 'Prestyler'

Carthage is a decentralized dependency manager. To integrate Prestyler into your Xcode project specify it in Cartfile:

github "kruil/Prestyler" "1.1.0"

How to use

Prestyler parse your string, applies defined rules, and gives NSAttributedString as a result:

import Prestyler
...
label.attributedText = "Hello, i am <b>bold<b> text!".prestyled()

You also can style a text directly by listing its styles:

label.attributedText = "Prestyler".prestyledBy(styles: UIColor.green)

Or by defined rules:

Prestyler.defineRule("myRule", UIColor.green)
...
label.attributedText = "All this text is bold.".prestyledBy(rule: "myRule")

Predefined rules

Several rules already defined. It's a <b> for bold, <i> for italic, <strike> and <underline> .

label.attributedText = "And here is <i>italic<i> text!".prestyled()

Custom rules

You can easy define your own simple rules.

Prestyler.defineRule("$", UIColor.green)
label.attributedText = "It's a $green$ text.".prestyled()

or more complex with different styles combination:

Prestyler.defineRule("<BigYellowBold>", 48, UIColor.yellow, Prestyle.bold)
label.attributedText = "It's a <BigYellowBold>green<BigYellowBold> text.".prestyled()

When you define a rule first parameter is a pattern to search in String format, and then you put list of styles. To define a style you can use next classes:

* Prestyle.bold // .italic, .strike, .underline
* Precolor(.red) // Precolor("#af45392"), Precolor().random . Read more about colors below
* UIFont // UIFont.italicSystemFont(ofSize: 33)
* UIColor // UIColor.green
* String // "432" or "#432"or "#648362" treated as hex color
* Int // 18, treated as a font size

Prefilters

You can easy highlight numbers or other information usign Prefilters. It parses string and inserts provided tags which will be used later for styling. Now available two methods to highlight numbers and particular part of text. Both forms are used in this example:

// Filter what you need and style it
Prestyler.defineRule("*", UIColor.red)
let text = "Highlight text or numbers like 23 or 865 in your text using Prefilter. " +
           "It parses your text, embrace numbers 73 and 1234, and you are ready to go."
let prefilteredText = text.prefilter(type: .numbers, by: "*").prefilter(text: "text", by: "^")
label.attributedText = prefilteredText.prestyled()

Working with colors 🎨

There are several ways you can manage colors in Prestyler. The easiest one is just to pass UIColor or hex string as a style:

Prestyler.defineRule("<colored>", UIColor.yellow)
Prestyler.defineRule("<colored>", "#b5e253")
Prestyler.defineRule("<colored>", "#ff0")
Prestyler.defineRule("<colored>", "ff2")

This colors would be applied to foreground text color. To set a background color you have to use Precolor class, which has several more interesting options.

Prestyler.defineRule("<colored>", Precolor(UIColor.yellow).forBackgound())
Prestyler.defineRule("<colored>", Precolor("#b5e253").forBackgound())
Prestyler.defineRule("<colored>", Precolor("#ff0").forBackgound())

Precolor has a random(_ percent: Int) method which allows you to get cool effects in seconds.

// Color is mixed for 50% with random color
Prestyler.defineRule("<randomRed>", Precolor(UIColor.red).random(50))
// 100% random
Prestyler.defineRule("<random>", Precolor().random())

Few things you need to know

Don't put a tag inside other tags. Results can be unexpectable (but safe). Instead create new Rule with desired style.
When you define already existing style the old one would replaced.

Example

To run the example project, clone the repo, and run pod install from the Example directory first.

Author

Ilia Krupko. I use Prestyler in my Monetal-ios project.

License

Prestyler is available under the MIT license. See the LICENSE file for more info.