NSString boundingRectWithSize:options:attributes:context: not usable in Swift?

Question

I get the error...

Could not find an overload for 'init' that accepts the supplied arguments

...when I try to use...

extension UIFont {
  func sizeOfString (string: String, constrainedToWidth width: Double) -> CGSize {
    NSString(string).boundingRectWithSize(CGSize(width, DBL_MAX),
                                          options: NSStringDrawingOptions.UsesLineFragmentOrigin,
                                          attributes: [NSFontAttributeName: self],
                                          context: nil).size
  }
}

Does NSString not support this method anymore, or am I messing up on the syntax?

to see here, the same question with the raw swift way:[https://stackoverflow.com/questions/30450434/figure-out-size-of-uilabel-based-on-string-in-swift/30450559#30450559](https://stackoverflow.com/questions/30450434/figure-out-size-of-uilabel-based-on-string-in-swift/30450559#30450559) — zzycami, Mar 31 '16 at 07:52

Jeffery Thomas · Accepted Answer · 2017-11-02T15:39:43.833

The initializers expect named arguments.

extension UIFont {
    func sizeOfString (string: String, constrainedToWidth width: Double) -> CGSize {
        return NSString(string: string).boundingRectWithSize(CGSize(width: width, height: DBL_MAX),
            options: NSStringDrawingOptions.UsesLineFragmentOrigin,
            attributes: [NSFontAttributeName: self],
            context: nil).size
    }
}

Note: Strings can be cast to NSStrings.

extension UIFont {
    func sizeOfString (string: String, constrainedToWidth width: Double) -> CGSize {
        return (string as NSString).boundingRectWithSize(CGSize(width: width, height: DBL_MAX),
            options: NSStringDrawingOptions.UsesLineFragmentOrigin,
            attributes: [NSFontAttributeName: self],
            context: nil).size
    }
}

or

extension UIFont {
    func sizeOfString (string: NSString, constrainedToWidth width: Double) -> CGSize {
        return string.boundingRectWithSize(CGSize(width: width, height: DBL_MAX),
            options: NSStringDrawingOptions.UsesLineFragmentOrigin,
            attributes: [NSFontAttributeName: self],
            context: nil).size
    }
}

--

UPDATED

For Swift 4 syntax

extension UIFont {
    func sizeOfString (string: String, constrainedToWidth width: Double) -> CGSize {
        return NSString(string: string).boundingRect(
            with: CGSize(width: width, height: .greatestFiniteMagnitude),
            options: .usesLineFragmentOrigin,
            attributes: [.font: self],
            context: nil).size
    }
}

after using like this i am getting compile time error - "UIFont does not have a member sizeOfString" — Nitesh, Dec 08 '14 at 08:22
@Nitesh Looks like you try to send `sizeOfString` to the `UIFont` (class) object. This one will not know about the new method, but its instances will. Try sending the method to a `UIFont` instance. Class methods can be defined in extensions too btw., though you would use `class fund …` to do that. — Patru, Dec 16 '14 at 17:16
For any copy-pasters, if you get an error such as `pointSize]: unrecognized selector sent to instance`, it's because you need to replace the self in `[NSFontAttributeName: self]` with a font. — paulvs, Apr 22 '16 at 19:26

score 4 · Answer 2 · answered Feb 13 '15 at 11:55

Alternatively you could cast it into an NSString

if let ns_str:NSString = str as NSString? {

   let sizeOfString = ns_str.boundingRectWithSize(
                                 CGSizeMake(self.titleLabel.frame.size.width, CGFloat.infinity), 
                                 options: NSStringDrawingOptions.UsesLineFragmentOrigin, 
                                 attributes: [NSFontAttributeName: lbl.font], 
                                 context: nil).size
}

score 4 · Answer 3 · answered Feb 27 '17 at 15:14

Latest Swift

func sizeOfString (string: String, constrainedToHeight height: Double) -> CGSize {
    return NSString(string: string).boundingRect(with: CGSize(width: DBL_MAX, height: height),
                                                 options: NSStringDrawingOptions.usesLineFragmentOrigin,
                                                 attributes: [NSFontAttributeName: UIFont.systemFont(ofSize: 20)],
                                                 context: nil).size
}

score 1 · Answer 4 · answered Sep 05 '17 at 18:35

Latest Swift:

import UIKit

extension UIFont {
    func sizeOfString(string: String, constrainedToWidth width: Double) -> CGSize {
        return NSString(string: string).boundingRect(with: CGSize(width: width, height: .greatestFiniteMagnitude),
                                                             options: .usesLineFragmentOrigin,
                                                             attributes: [NSFontAttributeName: self],
                                                             context: nil).size
    }
}

score 0 · Answer 5 · answered Nov 24 '15 at 06:55

You can use objective-c bridging

let lblRegisterlinkWidth: CGFloat = lblRegisterLink.text!._bridgeToObjectiveC().boundingRectWithSize(lblRegisterLink.frame.size, options: .UsesLineFragmentOrigin, attributes: [NSFontAttributeName : lblRegisterLink.font], context: nil).size.width

score 0 · Answer 6 · answered Apr 12 '18 at 12:49

Swift 4.1 version

extension UIFont {
    func sizeOfString (string: String, constrainedToWidth width: Double) -> CGSize {
        return NSString(string: string).boundingRect(with: CGSize(width: width, height: .greatestFiniteMagnitude), options: NSStringDrawingOptions.usesLineFragmentOrigin, attributes: [NSFontAttributeName: self], context: nil).size
    }
}

score 0 · Answer 7 · answered May 23 '19 at 07:16

Latest Swift 5:

extension UIFont {
    func size(OfString string: String, constrainedToWidth width: Double) -> CGSize {
        return NSString(string: string).boundingRect(with: CGSize(width: width, height: .greatestFiniteMagnitude),
                                                     options: .usesLineFragmentOrigin,
                                                     attributes: [.font: self],
                                                     context: nil).size
    }
}

score 0 · Answer 8 · edited Dec 13 '19 at 14:45

Swift 5

extension String {
    func sizeOfString(maxWidth: CGFloat, font: UIFont) -> CGSize {
        let tmp = NSMutableAttributedString(string: self, attributes:[NSAttributedString.Key.font: font])
        let limitSize = CGSize(width: maxWidth, height: CGFloat(MAXFLOAT))
        let contentSize = tmp.boundingRect(with: limitSize, options: .usesLineFragmentOrigin, context: nil)
        return contentSize.size
    }
}

NSString boundingRectWithSize:options:attributes:context: not usable in Swift?

8 Answers8