Swift : Append Characters in Attributed String

Question

I want to change color to all characters in string. But my code is giving just last character in string. I want to append characters in attributed string. How can I do this ?

My Code :

func test(){
            var str:String = "test string"

            for i in 0...count(str)-1{
                var test = str[advance(str.startIndex, i)]
                var attrString = NSAttributedString(string: toString(test), attributes: [NSForegroundColorAttributeName: rainbowColors()])
                label.attributedText = attrString
            }
    }

Community · Accepted Answer · 2017-05-23 11:52:28Z

4

In this case you don't need to append characters if you want each character to have the same rainbow color. You could do the following:

label.attributedText = NSAttributedString(string: str, attributes: [NSForegroundColorAttributeName: rainbowColors()])

If you want to append characters you need to use NSMutableAttributedString. It has a method called append.

Given the fact that you want a different color for each index do the following:

var str:String = "test string"

var attributedString = NSMutableAttributedString()
for (index, character) in enumerate(str) {
  attributedString.appendAttributedString(NSAttributedString(string:  String(character), attributes: [NSForegroundColorAttributeName: colorForIndex(index)]))
}

label.attributedText = attributedString

colorForIndex is a function you need to implement to get the rainbow color for that particular index

func colorForIndex(index: Int) -> UIColor {
  let color = // your function to get the color
  return color
}

If you need help to implement that function take a look at this question iOS rainbow colors array

edited May 23, 2017 at 11:52

CommunityBot

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answered Jul 27, 2015 at 0:58

Julian J. Tejera

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2 Comments

jorjj Over a year ago

No, I want each every character to have different color.

jorjj Over a year ago

Worked well ! I didn't know enumerate function. Thanks for helping. You rock ! :)

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