如何在 Swift 中使 NSAttributedString 的特定片段成为特定颜色

Question

我有一个UILabel 和一个NSAttributedString，代码如下：

// just creating from a notification.mainCopy!
var myMutableString = NSMutableAttributedString();
myMutableString = NSMutableAttributedString(string: notification.mainCopy!, attributes: [NSFontAttributeName:UIFont(name: "Helvetica", size: 14.0)!])

// a notification will have a blueMainCopy1 - just a test so no this could be done better
// How to make the blueMainCopy1 blue?
var myItalicizedRangeBlue = (notification.mainCopy! as NSString).rangeOfString(notification.blueMainCopy1!)
let blueFont = UIFont(name: "HelveticaNeue-BoldItalic", size:14.0) // how to make blue
myMutableString.addAttribute(NSFontAttributeName, value: blueFont!, range: myItalicizedRangeBlue)

在这种情况下，如何将信息添加到 blueFont 以使其变为蓝色？

有没有办法补充：

  let blueAttrs = [NSForegroundColorAttributeName : UIColor.blueColor()]

还是什么？

Answer 1

你已经有了这个：

let blueFont = UIFont(name: "HelveticaNeue-BoldItalic", size:14.0)
myMutableString.addAttribute(
    NSFontAttributeName, value: blueFont!, 
    range: myItalicizedRangeBlue)

还有这个：

let blueAttrs = [NSForegroundColorAttributeName : UIColor.blueColor()]

所以现在只需添加另一个属性：

myMutableString.addAttributes(
    blueAttrs, range: myItalicizedRangeBlue) // or any desired range

或者，如果它们具有相同的范围，则先组合属性并将它们相加：

let blueFont = UIFont(name: "HelveticaNeue-BoldItalic", size:14.0)
let blueAttrs = [
    NSFontAttributeName : blueFont!,
    NSForegroundColorAttributeName : UIColor.blueColor()
]
myMutableString.addAttributes(
    blueAttrs, range: myItalicizedRangeBlue)