Buddybuild is a CI, CD and user feedback platform built for mobile development teams - sign up for free and start building better apps!

Attributed strings are a fantastic way to work with styled text on iOS and OS X. NSAttributedString is an incredibly full-featured API, but because of this, simple tasks sometimes require a fair amount of boilerplate code. Today we'll look at BonMot, a library from Raizlabs that simplifies the process of composing attributed strings.

BonMot takes the form of a set of chainable functions that we can use to compose attributed strings:

let fancyQuote = "Traveling through hyperspace ain't" +
                 "like dusting crops, farm boy.\n" +
                 " β€” Han Solo"

quoteLabel.attributedText = BONChain()
  .fontNameAndSize("AmericanTypewriter", 17.0)

BonMot will do all the heavy lifting of applying attributes and return a fully-formed NSAttributedString ready for use wherever we need.

We can use BonMot to concatenate multiple composed attributed strings:

let chain = BONChain()

chain.appendLink(BONChain().string("one fish"))
chain.appendLink(BONChain().string("two fish"), separator:commaSpace)
chain.appendLink(BONChain().string("red fish").textColor(UIColor.redColor()), separator:commaSpace)
chain.appendLink(BONChain().string("blue fish").textColor(UIColor.blueColor()), separator:commaSpace)

BonMot even supports the NSTextAttachment parts of the NSAttributedString API. We can generate an β€œimage next to a label” like this:

    .fontNameAndSize("Futura-MediumItalic", 17.0)
    .string("It's a trap!"), separator:" ")

We've only scratched the surface here, BonMot has a ton of features to offer. More info about BonMot can be found at git.io/bonmot