UILabel 内的 lineSpacing 属性无法按预期工作 [英] lineSpacing property inside UILabel doesn't work as expected

问题描述

我正在尝试创建一个自定义 UILabel 类，这将允许我增加 UILabel 上的行间距.我知道您可以在 IB 中使用属性文本字符串执行此操作，但是如果您使用自定义字体，则它不起作用.这是我的课程代码:

I am trying to create a custom UILabel class which will allow me to increase the line spacing on a UILabel. I know you can do this in IB with an attributed text string, however it doesn't work if you are using custom fonts. Here is my class code:

import UIKit

@IBDesignable
class SpacingLabel: UILabel
{

    @IBInspectable var lineSpacing: CGFloat = 10.0

    override func awakeFromNib()
    {
        self.renderText()
    }

    override func prepareForInterfaceBuilder()
    {
        super.prepareForInterfaceBuilder()
        self.renderText()
    }

    func renderText()
    {
        var attrString = NSMutableAttributedString(string:self.text!)

       if font != nil
        {
            NSMutableParagraphStyle.defaultParagraphStyle().mutableCopy()
            var paragraphStyle = NSMutableParagraphStyle.defaultParagraphStyle().mutableCopy() as!     NSMutableParagraphStyle 
            paragraphStyle.textAlignment = self.textAlignment

            paragraphStyle.lineSpacing = self.lineSpacing
            paragraphStyle.paragraphSpacing = self.lineSpacing

            attrString.addAttributes([NSFontAttributeName : self.font!, NSParagraphStyleAttributeName : paragraphStyle], range: NSMakeRange(0, attrString.length))
            self.attributedText = attrString
        }

        self.needsUpdateConstraints()
    }

}

这是它在 IB(故事板)中的呈现方式:

This is how it renders in IB (Storyboard):

这是它在模拟器中的呈现方式:

And here's how it renders in the simulator:

我已经尝试添加 minimumLineHeight 和/或 maximumLineHeight 属性，但这些似乎在其他方面搞砸了...

I've tried adding minimumLineHeight and/or maximumLineHeight properties, but these just seem to mess it up in other ways...

推荐答案

所以...结果是 lineSpacing 属性在某种程度上与 UILabel 中的一个可能的私有变量/属性发生冲突.我将我的属性重命名为 leading，现在它可以完美运行.

So... It turned out that the property lineSpacing is somehow clashing with a possible private variable/property within UILabel. I renamed my property to leading and now it works perfectly.

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