如何更改 UILabel 中的字母间距？

Question

我想更改 UIKit UILabel 中数字之间的间距，使其相等。

使用标准间距，标签如下所示：

我希望它看起来像这样：

如何实现？

Answer 1

NSString *myString = @"127";
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:myString];

float letterSpacing = -1.50f; // change spacing here
[attributedString addAttribute:NSKernAttributeName value:@(letterSpacing) range:NSMakeRange(0, [myString length])];
[myLabel setAttributedText:attributedString];

另请参阅此以获取更多信息和结果：http://www.devsign.co/notes/tracking-and-character-spacing

Answer 2

单击标签并转到属性检查器。将文本从普通文本更改为属性文本。您将有几个间距选项。希望这有帮助。

Answer 3

您可以在 属性字符串上使用 NSKernAttributeName 属性:

UILabel *label = [UILabel new];

NSMutableAttributedString *text = [[NSMutableAttributedString alloc] 
                                   initWithString:@"127"];

// The value paramenter defines your spacing amount, and range is 
// the range of characters in your string the spacing will apply to. 
// Here we want it to apply to the whole string so we take it from 0 to text.length.
[text addAttribute:NSKernAttributeName 
             value:@-0.5 
             range:NSMakeRange(0, text.length)];

[label setAttributedText:text];

Answer 4

您可以使用 NSAttributedString 并使用 NSKernAttributeName 属性。此值的默认值为 0，因此您需要将其设置为负数。

https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSAttributedString_Class/#//apple_ref/doc/constant_group/Character_Attributes

在 Obj-C 中你可以这样做：

NSMutableAttributedString* attrStr = [[NSMutableAttributedString alloc]initWithString: @"Test test test test "];
[attrStr addAttribute:NSKernAttributeName value:@(4.0) range:NSMakeRange(0, attrStr.length)];

label.attributedText = attrStr;

在 Swift 你可以这样做：

let myTitle = "my title"
let titleLabel = UILabel()
let attributes: NSDictionary = [
    NSFontAttributeName:UIFont(name: "FONT_NAME", size: TEXT_SIZE),
    NSKernAttributeName:CGFloat(2.0)
]

let attributedTitle = NSAttributedString(string: myTitle, attributes:attributes as? [String : AnyObject])

titleLabel.attributedText = attributedTitle

Answer 5

最简单的方法是创建自定义 UILabel class 并从 Storyboard 设置字母间距。

open class CustomLabel : UILabel {
    @IBInspectable open var characterSpacing:CGFloat = 1 {
        didSet {
            let attributedString = NSMutableAttributedString(string: self.text!)
            attributedString.addAttribute(NSKernAttributeName, value: self.characterSpacing, range: NSRange(location: 0, length: attributedString.length))
            self.attributedText = attributedString
        }

    }
}

Answer 6

可以使用NSKernAttributeName。

但更正其他答案：不适用于全文长度，但 (text.length - 1).

在字母中添加负间距或正间距，最后一个不需要。假设您要添加一个正间距，它最终会在最后一个字母之后有一个间距。居中的字符串似乎不再居中。这同样适用于负间距。

NSString *text = @"Sample Text";    
UILabel *label = [UILabel new]

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString: text];
[attributedString addAttribute:NSKernAttributeName value:[NSNumber numberWithDouble:-1.0] range:NSMakeRange(0, text.length-1)];

[label setAttributedTitle:attributedString forState:UIControlStateNormal];

适用于全文长度。

应用于（文本长度 - 1）。

Answer 7

如果您想将字母间距属性应用于 Interface Builder 中的所有 UILabel 而无需修改任何内容（对于特定字体）：

Swift 4:

/**
 * Applies letter spacing to selected fonts in UILabels from IB.
 *
 * - author Alexander Volkov
 * - version 1.0
 */
extension UILabel {

    /// Applies letter spacing
    open override func awakeFromNib() {
        super.awakeFromNib()
        applyLetterSpacing()
    }

    /// Applies letter spacing
    ///
    /// - Parameter aDecoder: the decoder
    /// - Returns: UILabel instance
    open override func awakeAfter(using aDecoder: NSCoder) -> Any? {
        let label = super.awakeAfter(using: aDecoder)
        self.applyLetterSpacing()
        return label
    }


    /// Applies letter spacing
    func applyLetterSpacing() {
        if font.fontName.contains("Oswald", caseSensitive: false) {
            let characterSpacing: CGFloat = 1
            let string = NSMutableAttributedString(string: self.text!)
            string.addAttribute(.kern, value: characterSpacing, range: NSRange(location: 0, length: string.length - 1))
            self.attributedText = string
        }
    }
}

Answer 8

我已经从@J2K 那里得到答案并将其翻译成 Swift 4.2 扩展。

/// Set the text of the label but altering the kerning so that you can control the space between each characters.
///
/// - Parameters:
///   - text: New content of the label
///   - kerning: Set a value between 0 and 1 to lower the space between characters. Above 0, spacing will be increased. 0 disables kerning.
extension UILabel {

    func set(text: String, withKerning kerning: CGFloat) {
        let attributedString = NSMutableAttributedString(string: text)

        // The value parameter defines your spacing amount, and range is
        // the range of characters in your string the spacing will apply to.
        // Here we want it to apply to the whole string so we take it from 0 to text.count.
        attributedString.addAttribute(NSAttributedString.Key.kern, value: kerning, range: NSMakeRange(0, text.count))

        attributedText = attributedString
    }

}

Answer 9

swift 实现看起来像

let text = "TIPS, ARTICLES & BEST OFFERS"
label.attributedText = NSAttributedString(string: text, attributes: [.kern: 3.12])

Answer 10

我发现这是最好的解决方案。它还包括 UIButton，应用可能已在界面构建器中设置的属性并适应不同的字体：

extension UILabel {

    open override func awakeFromNib() {
        super.awakeFromNib()
        applyLetterSpacing()
    }

    func applyLetterSpacing() {
        // return if empty text
        if((text ?? "").isEmpty) {
            return
        }

        // default spacing
        var spacing = 1
        if(font.familyName == "Source Serif Pro") {
            // custom spacing for different font
            spacing = 2
        }
        var attributes = attributedText?.attributes(at: 0, effectiveRange: nil) ?? [:]
        attributes[.kern] = spacing
        attributedText = NSAttributedString(string: text ?? "", attributes: attributes)
    }

}

和按钮

extension UIButton {

    open override func awakeFromNib() {
        super.awakeFromNib()
        applyLetterSpacing()
    }

    func applyLetterSpacing() {
        if((title(for: .normal) ?? "").isEmpty) {
            return
        }
        var attributes = attributedTitle(for: .normal)?.attributes(at: 0,     effectiveRange: nil) ?? [:]
        attributes[.kern] = 1
        attributes[.foregroundColor] = titleColor(for: .normal)
        setAttributedTitle(NSAttributedString(string: title(for: .normal) ?? "", attributes: attributes), for: .normal)
    }
}

如何更改 UILabel 中的字母间距？

How do I change the letter spacing in a UILabel?

spacing

uilabel

ios