在NSift中将NSUnderlineStyle.PatternDash添加到NSAttributedString？ [英] Add NSUnderlineStyle.PatternDash to NSAttributedString in Swift?

问题描述

我正在尝试在我的Swift应用中为某些文字添加下划线。这是我目前的代码：

I'm trying to add an underline to some text in my Swift app. This is the code I have currently:

let text = NSMutableAttributedString(string: self.currentHome.name)

let attrs = [NSUnderlineStyleAttributeName:NSUnderlineStyle.PatternDash]

text.addAttributes(attrs, range: NSMakeRange(0, text.length))
homeLabel.attributedText = text

但我在 text.addAttributes 行上收到此错误：

But I get this error on the text.addAttributes line:

NSString 与 NSObject不同

如何将枚举中包含的属性添加到Swift中的NSMutableAttributedString？

How can I add an attribute contained in an enum to an NSMutableAttributedString in Swift?

推荐答案

更新 Swift 4 语法：

这是一个完整的使用带下划线的文本创建 UILabel 的示例：

Here's a full example of creating a UILabel with underlined text:

let homeLabel = UILabel(frame: CGRect(x: 0, y: 0, width: 100, height: 30))

let text = NSMutableAttributedString(string: "hello, world!")

let attrs = [NSAttributedStringKey.underlineStyle: NSUnderlineStyle.patternDash.rawValue | NSUnderlineStyle.styleSingle.rawValue]

text.addAttributes(attrs, range: NSRange(location: 0, length: text.length))

homeLabel.attributedText = text

---

Swift 2：

Swift允许您将 Int 传递给采用 NSNumber ，所以你可以通过删除转换为 NSNumber 来使这个更清洁：

Swift allows you to pass an Int to a method that takes an NSNumber, so you can make this a little cleaner by removing the conversion to NSNumber:

text.addAttribute(NSUnderlineStyleAttributeName, value: NSUnderlineStyle.StyleDouble.rawValue, range: NSMakeRange(0, text.length))

注意：此答案以前使用原始问题中使用的 toRaw（），但现在这个答案不正确 toRaw（）已被属性 rawValue 取代。

Note: This answer previously used toRaw() as used in the original question, but that is now incorrect as toRaw() has been replaced by the property rawValue as of Xcode 6.1.

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