如何使用Xcode 7中的Interface Builder调整文本字距调整？

问题描述

我在Interface Builder中可以看到 NSAttributedParagraphStyle 的无数设置：

There are a myriad of settings for NSAttributedParagraphStyle that I can see in Interface Builder:

但这些都不是用于文本字距调整。有没有办法在Xcode 7的Interface Builder中调整文本字距调整以获取属性文本？

But none of these are for text kerning. Is there a way to adjust the text kerning in Xcode 7's Interface Builder for attributed text?

推荐答案

您实际上可以在不使用扩展子类的情况下执行此操作。

You can actually do this without the use of a subclass through an extension.

import UIKit

@IBDesignable
extension UILabel {
    @IBInspectable
    public var kerning:CGFloat {
        set{
            if let currentAttibutedText = self.attributedText {
                let attribString = NSMutableAttributedString(attributedString: currentAttibutedText)
                attribString.addAttributes([NSKernAttributeName:newValue], range:NSMakeRange(0, currentAttibutedText.length))
                self.attributedText = attribString
            }
        } get {
            var kerning:CGFloat = 0
            if let attributedText = self.attributedText {
                attributedText.enumerateAttribute(NSKernAttributeName,
                                                  in: NSMakeRange(0, attributedText.length),
                                                  options: .init(rawValue: 0)) { (value, range, stop) in
                                                    kerning = value as? CGFloat ?? 0
                }
            }
            return kerning
        }
    }
}

虽然这实际上不会显示在界面构建器中，但它会在您运行应用程序时显示并工作。

While this won't actually show up in interface builder it will show up and work when you run your app.

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