How to increase the character spacing in UILabel

问题

I am creating an app in >=iOS6. And I want to change the character spacing in UILabel. I have added the custom font "FUTURABT HEAVY" in my app but the Character are too close to eachother.

I have find the good code here to increase the character spacing. But if i tried to change it than my text became left- align in stead of center.

Please help me with this situation.

回答1:

You should probably use NSAttributedString with NSKernAttributeName attribute

Here is a small example:

UILabel *label = [[UILabel alloc] initWithFrame:self.view.bounds];

NSString *string = @"Some important text";
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];

float spacing = 5.0f;
[attributedString addAttribute:NSKernAttributeName
            value:@(spacing)
            range:NSMakeRange(0, [string length])];

label.attributedText = attributedString;
[self.view addSubview:label];

回答2:

Swift extension for this

extension UILabel {
    func addCharactersSpacing(spacing:CGFloat, text:String) {
        let attributedString = NSMutableAttributedString(string: text)
        attributedString.addAttribute(NSKernAttributeName, value: spacing, range: NSMakeRange(0, text.characters.count))
        self.attributedText = attributedString
    }
}

So you can use it

MyLabel.addCharactersSpacing(5, text: "Some Text")

回答3:

Swift 4

extension UILabel {

   func setCharacterSpacing(characterSpacing: CGFloat = 0.0) {

        guard let labelText = text else { return }

        let attributedString: NSMutableAttributedString
        if let labelAttributedText = attributedText {
            attributedString = NSMutableAttributedString(attributedString: labelAttributedText)
        } else {
            attributedString = NSMutableAttributedString(string: labelText)
        }

        // Character spacing attribute
        attributedString.addAttribute(NSAttributedStringKey.kern, value: characterSpacing, range: NSMakeRange(0, attributedString.length))

        attributedText = attributedString
    }        

}

Swift 3

let label = UILabel()
let stringValue = "Sample text"
let attrString = NSMutableAttributedString(string: stringValue)
attrString.addAttribute(NSKernAttributeName, 2: style, range: NSRange(location: 0, length: stringValue.characters.count))
label.attributedText = attrString

回答4:

   NSString *strDigit= @"001";
   NSString *strCrushImpact =[NSStringstringWithFormat:@"%d",[strDigit intValue]];

       // Set space in between character
   float spacing = 3.0f;

   NSMutableAttributedString *attributedStrDigit = [[NSMutableAttributedString alloc] initWithString:strWin];
   [strCrushImpact addAttribute:NSKernAttributeName value:@(spacing)
             range:NSMakeRange(0, [strDigit length])];
 label.attributedText = attributedStrDigit;

回答5:

Swift 4.2 with UILabel extension and @IBInspectable

extension UILabel {
@IBInspectable var letterSpacing: CGFloat {
    get {
        var range:NSRange = NSMakeRange(0, self.text?.count ?? 0)
        let nr = self.attributedText?.attribute(NSAttributedString.Key.kern, at: 0, effectiveRange: &range) as! NSNumber
        return CGFloat(truncating: nr)
    }

    set {
        let range:NSRange = NSMakeRange(0, self.text?.count ?? 0)

        let attributedString = NSMutableAttributedString(string: self.text ?? "")
        attributedString.addAttribute(NSAttributedString.Key.kern, value: newValue, range: range)
        self.attributedText = attributedString
    }
}

}

来源：https://stackoverflow.com/questions/20580736/how-to-increase-the-character-spacing-in-uilabel

标签

ios

uilabel

character-spacing