Display attributed text in textview in swift 3? - html

Question

I want to display text in Italic ,bold which is received from server .
< p > < b > < i > hello < /i > < /b > < i >world< /i >< /p > so,
responseObj!["text"] = "<p><b><i>hello</i></b><i>world</></p>"
if let postText:String = responseObj!["text"] as? String{
let str = try NSAttributedString(data: postText.data(using: String.Encoding.unicode, allowLossyConversion: true)!, options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType], documentAttributes: nil)
self.textView.attributedText = str
}
when i am adding like this means my text displays normal without applying bold & italic . I want text to be displayed in bold ,italic .

Answer 1

EDIT: Updated Swift 4
Create an extension for String:
extension String {
func htmlAttributedString(fontSize: CGFloat = 17.0) -> NSAttributedString? {
let fontName = UIFont.systemFont(ofSize: fontSize).fontName
let string = self.appending(String(format: "<style>body{font-family: '%#'; font-size:%fpx;}</style>", fontName, fontSize))
guard let data = string.data(using: String.Encoding.utf16, allowLossyConversion: false) else { return nil }
guard let html = try? NSMutableAttributedString (
data: data,
options: [NSAttributedString.DocumentReadingOptionKey.documentType: NSAttributedString.DocumentType.html],
documentAttributes: nil) else { return nil }
return html
}
}
Invoke it anywhere in your project:
text.htmlAttributedString() // will set fontSize with 17.0 which is the default value
text.htmlAttributedString(fontSize: 14.0) // pass your required fontSize
Note, that let string = self.appending(String(format: "<style>body{font-family: '%#'; font-size:%fpx;}</style>", fontName, fontSize)) is used to keep the string font as same as the font used in default iOS platform.
To set the string on UITextView use:
textView.attributedText = textToBeConverted.htmlAttributedString() ?? ""
RESULT:

Answer 2

Assign Attributed text to UITextView from below function,
//HTML to Attributed text
func stringFromHtml(string: String) -> NSAttributedString? {
do {
let data = string.data(using: String.Encoding.utf8, allowLossyConversion: true)
if let d = data {
let str = try NSAttributedString(data: d,
options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],
documentAttributes: nil)
return str
}
} catch {
}
return nil
}
//This will give you attributed text which you have to assign to your UITextView. and whatever string having html tag that you have to pass inside this function.
//Below code will conver attributed text to HTML Text
//Attributed to HTML text
let attrStr = self.txtView.attributedText
let documentAttributes = [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType]
do {
let htmlData = try attrStr?.data(from: NSMakeRange(0, (attrStr?.length)!), documentAttributes:documentAttributes)
if let htmlString = String(data:htmlData!, encoding:String.Encoding.utf8) {
print(htmlString)
}
}
catch {
print("error creating HTML from Attributed String")
}