how to append Attributed Text String with Attributed String in Swift

Question

I want to append an Attributed Text with another Attributed Text in Swift. Please provide any sample code for appending operation of two attributed String in Swift.

Possible duplicate of How can I concatenate NSAttributedStrings? — jtbandes
– jtbandes, Commented Apr 7, 2016 at 6:16

rptwsthi · Accepted Answer · 2022-07-25 19:18:23Z

160

Use NSMutableAttributedString to achieve that.

Example

Swift 5

let yourAttributes = [NSAttributedString.Key.foregroundColor: UIColor.black, NSAttributedString.Key.font: UIFont.systemFont(ofSize: 15)]
let yourOtherAttributes = [NSAttributedString.Key.foregroundColor: UIColor.red, NSAttributedString.Key.font: UIFont.systemFont(ofSize: 25)]

let partOne = NSMutableAttributedString(string: "This is an example ", attributes: yourAttributes)
let partTwo = NSMutableAttributedString(string: "for the combination of Attributed String!", attributes: yourOtherAttributes)

partOne.append(partTwo)

Swift 3

let yourAttributes = [NSForegroundColorAttributeName: UIColor.black, NSFontAttributeName: UIFont.systemFont(ofSize: 15)]
let yourOtherAttributes = [NSForegroundColorAttributeName: UIColor.red, NSFontAttributeName: UIFont.systemFont(ofSize: 25)]

let partOne = NSMutableAttributedString(string: "This is an example ", attributes: yourAttributes)
let partTwo = NSMutableAttributedString(string: "for the combination of Attributed String!", attributes: yourOtherAttributes)

let combination = NSMutableAttributedString()

combination.append(partOne)
combination.append(partTwo)

combination represents your final string which contains both formattings provided by yourAttributes and yourOtherAttributes

Even older

let yourAttributes = [NSForegroundColorAttributeName: UIColor.blackColor(), NSFontAttributeName: UIFont.systemFontOfSize(15)]
let yourOtherAttributes = [NSForegroundColorAttributeName: UIColor.redColor(), NSFontAttributeName: UIFont.systemFontOfSize(25)]

let partOne = NSMutableAttributedString(string: "This is an example ", attributes: yourAttributes)
let partTwo = NSMutableAttributedString(string: "for the combination of Attributed String!", attributes: yourOtherAttributes)

let combination = NSMutableAttributedString()

combination.appendAttributedString(partOne)
combination.appendAttributedString(partTwo)

edited Jul 25, 2022 at 19:18

rptwsthi

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answered Apr 7, 2016 at 6:17

glace

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2 Comments

Matt Bearson Over a year ago

I was surprised to find that, still in Swift 3, it seems to be essential to initialize the NSMutableAttributedString empty in order to append to it.

glace Over a year ago

I smell the sarcasm, but it is seriously strange that one cant just append partTwo to partOne without an empty initialized NSMAString....

Lou Zell · Accepted Answer · 2018-10-11 14:21:33Z

20

@glace's answer, modified to avoid empty NSMutableAttributedString declaration. Valid in Swift 3.1:

let yourAttributes = [NSForegroundColorAttributeName: UIColor.blackColor(), NSFontAttributeName: UIFont.systemFontOfSize(15)]
let yourOtherAttributes = [NSForegroundColorAttributeName: UIColor.redColor(), NSFontAttributeName: UIFont.systemFontOfSize(25)]

let partOne = NSMutableAttributedString(string: "This is an example ", attributes: yourAttributes)
let partTwo = NSMutableAttributedString(string: "for the combination of Attributed String!", attributes: yourOtherAttributes)

partOne.append(partTwo)

partOne is then your final string with all the attributes. No intermediate "combiner" necessary.

Swift 4

let yourAttributes: [NSAttributedString.Key: Any] = [.foregroundColor: UIColor.black, .font: UIFont.systemFont(ofSize: 15)]
let yourOtherAttributes: [NSAttributedString.Key: Any] = [.foregroundColor: UIColor.red, .font: UIFont.systemFont(ofSize: 25)]

let partOne = NSMutableAttributedString(string: "This is an example ", attributes: yourAttributes)
let partTwo = NSMutableAttributedString(string: "for the combination of Attributed String!", attributes: yourOtherAttributes)

partOne.append(partTwo)

edited Oct 11, 2018 at 14:21

Lou Zell

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answered Aug 14, 2017 at 14:55

leanne

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1 Comment

glace Over a year ago

By the time of my answer, the empty declaration of the combiner was necessary. Im off from Swift since then, cant confirm if changes in Swift 3.1 are making this possible.

Community · Accepted Answer · 2020-06-20 09:12:55Z

9

Swift 5

As per "glace" answer, I just update font attribute and swift version.

    let boldFontAttributes = [NSAttributedString.Key.foregroundColor: UIColor.black, NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 17)]
    let normalFontAttributes = [NSAttributedString.Key.foregroundColor: UIColor.darkGray, NSAttributedString.Key.font: UIFont.systemFont(ofSize: 15)]
    let partOne = NSMutableAttributedString(string: "This is an example ", attributes: boldFontAttributes)
    let partTwo = NSMutableAttributedString(string: "for the combination of Attributed String!", attributes: normalFontAttributes)

    let combination = NSMutableAttributedString()
    
    combination.append(partOne)
    combination.append(partTwo)
    lblUserName.attributedText = combination

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Jun 17, 2019 at 13:15

Vivek

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Comments

cnu · Accepted Answer · 2019-01-30 10:13:27Z

2

using extension,

extension NSMutableAttributedString{
    func getAttributedStringByAppending(attributedString:NSMutableAttributedString) -> NSMutableAttributedString{
        let newAttributedString = NSMutableAttributedString()
        newAttributedString.append(self)
        newAttributedString.append(attributedString)
        return newAttributedString
    }
}

Usage: attributedString1, attributedString2 are two NSMutableAttributedString, then

let combinedAttributedString = attributedString1.getAttributedStringByAppending(attributedString: attributedString2)

answered Jan 30, 2019 at 10:13

cnu

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Comments

Celiuska · Accepted Answer · 2021-02-10 12:50:13Z

-2

Swift 5

You can create the different attributes:

let kString1Attributes = NSAttributedString.attributes(foregroundColor: UIColor.white)
let kString2Attributes = NSAttributedString.attributes(foregroundColor: UIColor.black)

Define your attributed strings:

let attrString1 = NSAttributedString(string: "my string" + " ",
                                     attributes: kString1Attributes)
let attrString2 = NSAttributedString(string: "string 2",
                                     attributes: kString2Attributes)

Include them in an array and combine them all together:

let combinedAttrString = [attrString1, attrString2].joined()

answered Feb 10, 2021 at 12:50

Celiuska

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1 Comment

Smartcat Over a year ago

There is no joined().

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