Question

我正在＆gt; = iOS6中创建一个应用。我想改变UILabel中的字符间距。我在我的应用程序中添加了自定义字体“FUTURABT HEAVY”但字符太靠近了。

我找到了好的代码here来增加字符间距。但是如果我试图改变它而不是我的文本变成左对齐而不是中心。

请帮我解决这个问题。

Answer 1

您应该将NSAttributedString与NSKernAttributeName属性

一起使用

这是一个小例子：

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];

Answer 2

此快速扩展

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
    }
}

所以你可以使用它

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

Answer 3

Swift 4

1|20     first range is starting with zero and ending on starting + length
6|40     second range starting with end of the last range

Swift 3

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
    }        

}

Answer 4

以下是带有方便扩展的Swift 5的代码：

extension UILabel {
    func addCharactersSpacing(spacing: CGFloat, txt: String) {
        let attributedString = NSMutableAttributedString(string: txt)
        attributedString.addAttribute(NSAttributedString.Key.kern, value: spacing, range: NSRange(location: 0, length: txt.count))
        self.attributedText = attributedString
    }
}

Answer 5

   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;

Answer 6

带有UILabel扩展和@IBInspectable的Swift 4.2

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
    }
}

}

如何增加UILabel中的字符间距

6 个答案: