我怎样才能用带有 UILabel 的 NSAttributedString 描边和填充 [英] How can I both stroke and fill with NSAttributedString w/ UILabel

问题描述

是否可以使用 NSAttributedString 和 UILabel 同时应用 stroke 和 fill?

Is it possible to apply both stroke and fill with an NSAttributedString and a UILabel?

推荐答案

是的，关键是给NSStrokeWidthAttributeName应用一个Negative值如果此值为正数，您将只会看到笔触，而不会看到填充.

Yes, the key is to apply a Negative value to the NSStrokeWidthAttributeName If this value is positive you will only see the stroke and not the fill.

目标-C:

self.label.attributedText=[[NSAttributedString alloc] 
initWithString:@"string to both stroke and fill" 
attributes:@{
             NSStrokeWidthAttributeName: @-3.0,
             NSStrokeColorAttributeName:[UIColor yellowColor],
             NSForegroundColorAttributeName:[UIColor redColor]
             }
];

感谢下面的@cacau:另请参阅技术问答 QA1531

Thanks to @cacau below: See also Technical Q&A QA1531

Swift 4 版本:

let attributes: [NSAttributedStringKey : Any] = [.strokeWidth: -3.0,
                                                 .strokeColor: UIColor.yellow,
                                                 .foregroundColor: UIColor.red]

label.attributedText = NSAttributedString(string: text, attributes: attributes)

Swift 5.1 版本:

let attributes: [NSAttributedString.Key : Any] = [.strokeWidth: -3.0,
                                                  .strokeColor: UIColor.yellow,
                                                  .foregroundColor: UIColor.red]

label.attributedText = NSAttributedString(string: text, attributes: attributes)

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