I hav written two fuction to Add underline to a String and remove underline :
I want to toggle underline with a button. So how do I check if NSMutableAttributedString has underline attribute :
func addUlnTxtFnc(TxtPsgVal :String) -> NSMutableAttributedString
{
let TxtRngVal = NSMakeRange(0, TxtPsgVal.characters.count)
let TxtUnlVal = NSMutableAttributedString(string: TxtPsgVal)
TxtUnlVal.addAttribute(NSUnderlineStyleAttributeName, value:NSUnderlineStyle.StyleSingle.rawValue, range: TxtRngVal)
return TxtUnlVal
}
func rmvUlnTxtFnc(TxtPsgVal :NSMutableAttributedString) -> NSMutableAttributedString
{
let TxtRngVal = NSMakeRange(0, TxtPsgVal.string.Len())
TxtPsgVal.removeAttribute(NSUnderlineStyleAttributeName, range: TxtRngVal)
return TxtPsgVal
}
You can check by calling the function .enumerateAttribute(attrName:, inRange:, options:, usingBlock:)
on the NSMutableAttributedString
you get in as the parameter:
func rmvUlnTxtFnc(TxtPsgVal: NSMutableAttributedString) -> NSMutableAttributedString {
let TxtRngVal = NSMakeRange(0, TxtPsgVal.length)
TxtPsgVal.enumerateAttribute(NSUnderlineStyleAttributeName, inRange: TxtRngVal, options: .LongestEffectiveRangeNotRequired) { attribute, range, pointer in
if attribute != nil {
TxtPsgVal.removeAttribute(NSUnderlineStyleAttributeName, range: range)
}
}
return TxtPsgVal
}
Also, you can shorten your first function to a single line:
func addUlnTxtFnc(TxtPsgVal: String) -> NSMutableAttributedString {
return NSMutableAttributedString(string: TxtPsgVal, attributes: [NSUnderlineStyleAttributeName: NSUnderlineStyle.StyleSingle.rawValue])
}
As an aside, your code does not conform to the Swift style guidelines proposed by the Swift community.