如何增加UILabel中的字符间距

Question

我在> = iOS6中创建了一个应用程序.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"但字符太靠近了彼此.

我在这里找到了很好的代码来增加字符间距.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

你应该使用NSAttributedString带NSKernAttributeName属性

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

Swift扩展为此

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

斯威夫特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
    }        

}

斯威夫特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