将NSUnderlineStyle.PatternDash添加到Swift中的NSAttributedString？

Question

我正在尝试在我的Swift应用程序中为某些文本添加下划线.这是我目前的代码:

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

let attrs = [NSUnderlineStyleAttributeName:NSUnderlineStyle.PatternDash]

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

但我得到这个错误text.addAttributes:

NSString 与...不完全相同 NSObject

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

Answer 1

更新Swift 4语法:

以下是创建UILabel带下划线文本的完整示例:

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

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

let attrs = [NSAttributedString.Key.underlineStyle: NSUnderlineStyle.patternDash.rawValue | NSUnderlineStyle.single.rawValue]

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

homeLabel.attributedText = text

斯威夫特2:

Swift允许你传递Int给一个带有的方法NSNumber,所以你可以通过删除转换为NSNumber:

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

注意:此答案以前toRaw()在原始问题中使用,但现在不正确,因为toRaw()已被rawValueXcode 6.1中的属性所取代.

Answer 2

如果你想要一个实际的虚线,你应该OR | PatternDash和StyleSingle枚举的原始值如下所示:

let dashed     =  NSUnderlineStyle.PatternDash.rawValue | NSUnderlineStyle.StyleSingle.rawValue

let attribs    = [NSUnderlineStyleAttributeName : dashed, NSUnderlineColorAttributeName : UIColor.whiteColor()];

let attrString =  NSAttributedString(string: plainText, attributes: attribs)

Answer 3

在Xcode 6.1中,SDK iOS 8.1 toRaw()已被替换为rawValue:

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

或更容易:

 var text : NSAttributedString = NSMutableAttributedString(string: str, attributes : [NSUnderlineStyleAttributeName: NSUnderlineStyle.StyleSingle.rawValue])