swift: edit text in JSON - ios

Question

I have JSON file with text and label. In JSON file I want to add this characters <b> or <i> to some words. For example:
"this is my text <b>bold<b> or <i>italic<i>"
And before when I show text in label I want to analyse my text and if some words have this characters <b> or <i> I want to make this word bold or italic in the text of the label. How to do it? Or there are another way to make bold text from JSON?
UPDATE:
Yours code:
/* Set Tagged Text & Fonts */
let taggedTextString = myText.text
let tagFont = UIFont.boldSystemFont(ofSize: 17.0)
let normalFont = UIFont.systemFont(ofSize: 17.0)
/* You can simply assign the AttributedText to the modified String, which may return nil. */
textLabel.attributedText = taggedTextString.modifyFontWithTags(openingTag: "<tag>", closingTag: "</tag>", taggedFont: tagFont, unTaggedFont: normalFont)
My code:
var attributedString = NSMutableAttributedString(string: myText.text)
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 5
attributedString.addAttribute(NSAttributedStringKey.paragraphStyle, value:paragraphStyle, range:NSMakeRange(0, attributedString.length))
textLabel.attributedText = attributedString;
Is this code the best way to union your and my code?
for i in stride(from: 0, to: allTagsSplitArray.count, by: 1) {
finalAttrStr.append(NSMutableAttributedString(string: allTagsSplitArray[i], attributes: [kCTFontAttributeName as NSAttributedStringKey : i % 2 == 0 ? untaggedTextFont : taggedTextFont]))
// my code
finalAttrStr.addAttribute(NSAttributedStringKey.paragraphStyle, value:paragraphStyle, range:NSMakeRange(0, finalAttrStr.length))
}

Answer 1

The simplest way I seem to have accomplished this is by running through the string and scanning for your key tags - <b>, <i>, etc.
To make things easier (and more reusable), we should make an extension of our String or NSAttributedString classes. For this example, I've extended the String class, and and I return a NSAttributedString:
func modifyFontWithTags(openingTag: String, closingTag: String, taggedFont: UIFont?, unTaggedFont: UIFont?) -> NSMutableAttributedString? {
/* Make sure we have everything we need. */
guard let taggedTextFont = taggedFont,
let untaggedTextFont = unTaggedFont,
!self.isEmpty,
self.contains(openingTag),
self.contains(closingTag) else { return nil }
/* Split the string up using our closing tag. */
let closingTagSplitArray = self.components(separatedBy: closingTag)
/* Make a placeholder array. */
var allTagsSplitArray = [String]()
/* Iterate through our split array. */
for item in closingTagSplitArray {
if item.contains(openingTag) {
/* Strip the opening tag & append. */
allTagsSplitArray.append(contentsOf: item.components(separatedBy: openingTag))
} else {
/* Just append. */
allTagsSplitArray.append(item)
}
}
/* Instantiate our attributed string. */
let finalAttrStr = NSMutableAttributedString()
for i in stride(from: 0, to: allTagsSplitArray.count, by: 1) {
/* Add our font to every-other item in the array (the tagged portions). */
finalAttrStr.append(NSMutableAttributedString(string: allTagsSplitArray[i], attributes: [NSFontAttributeName : i % 2 == 0 ? untaggedTextFont : taggedTextFont]))
}
return finalAttrStr
}
Note: In this example, I take in an UIFont parameter, but you can modify this function to take in whatever attribute types you want.