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
But I get this error on the text.addAttributes
line:
NSString
is not identical toNSObject
How can I add an attribute contained in an enum to an NSMutableAttributedString in Swift?
Here's a full example of creating a UILabel
with underlined text:
Swift 5:
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
Swift 4:
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 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))
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has been replaced by the property rawValue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.
If you want an actual dashed line, you should OR | the raw values of both PatternDash and StyleSingle enums like below:
let dashed = NSUnderlineStyle.PatternDash.rawValue | NSUnderlineStyle.StyleSingle.rawValue
let attribs = [NSUnderlineStyleAttributeName : dashed, NSUnderlineColorAttributeName : UIColor.whiteColor()];
let attrString = NSAttributedString(string: plainText, attributes: attribs)
In Xcode 6.1, SDK iOS 8.1 toRaw()
has been replaced by rawValue
:
text.addAttribute(NSUnderlineStyleAttributeName, value: NSUnderlineStyle.StyleDouble.rawValue, range: NSMakeRange(0, text.length))
Or Easier :
var text : NSAttributedString = NSMutableAttributedString(string: str, attributes : [NSUnderlineStyleAttributeName: NSUnderlineStyle.StyleSingle.rawValue])
Turns out I needed the toRaw()
method - this works:
text.addAttribute(NSUnderlineStyleAttributeName, value: NSNumber(integer:(NSUnderlineStyle.StyleDouble).toRaw()), range: NSMakeRange(0, text.length))
来源:https://stackoverflow.com/questions/25611716/add-nsunderlinestyle-patterndash-to-nsattributedstring-in-swift