NSAttributedString bullet list issues - ios

Question

I am trying to create a bullet list using NSAttributedString and UITextView. And, here is what I was able to achieve so far:
As one can see, there is a small "shift" between two lines. Here is a fragment of code which I use to build attributed string:
func add(bulletList strings: [String],
indentation: CGFloat = 15,
lineSpacing: CGFloat = 3,
paragraphSpacing: CGFloat = 10) {
func createParagraphAttirbute() -> NSParagraphStyle {
var paragraphStyle: NSMutableParagraphStyle
let nonOptions = NSDictionary() as! [NSTextTab.OptionKey: Any]
paragraphStyle = NSParagraphStyle.default.mutableCopy() as! NSMutableParagraphStyle
paragraphStyle.tabStops = [
NSTextTab(textAlignment: .left, location: indentation, options: nonOptions)]
paragraphStyle.defaultTabInterval = indentation
paragraphStyle.firstLineHeadIndent = 0
paragraphStyle.lineSpacing = lineSpacing
paragraphStyle.paragraphSpacing = paragraphSpacing
paragraphStyle.headIndent = indentation
return paragraphStyle
}
var buffer = NSMutableAttributedString.init()
for string in strings {
let formattedString = "\u{2022} \(string)\n"
let attributedString = NSMutableAttributedString(string: formattedString)
let paragraphStyle = createParagraphAttirbute()
attributedString.addAttributes(
[NSAttributedStringKey.paragraphStyle : paragraphStyle],
range: NSMakeRange(0, attributedString.length))
attributedString.addAttributes(
textAttributes,
range: NSMakeRange(0, attributedString.length))
let string:NSString = NSString(string: formattedString)
let rangeForBullet:NSRange = string.range(of: bulletPoint)
attributedString.addAttributes(bulletAttirbutes, range: rangeForBullet)
buffer.append(attributedString)
}
}
Do you think something is wrong with selected paragraph parameters? Because the code does almost what is expected, excluding this gap.
Update 1
Following #the4kman advice, I've changed provided code like this:
paragraphStyle.firstLineHeadIndent = indentation
But now I have all lines aligned with each other, including the bullet point:
Update 2
Ok, the solution was quite simple - replace space with tab. See updated code below.

Answer 1

#the4kman, #Krunal, Thank you for your responses! The solution was even more simple. Replacing space symbol with \t in let formattedString = "\u{2022} \(string)\n gives you valid indentation.
For completeness, the full solution code is (just replacing one char):
func add(bulletList strings: [String],
font: UIFont,
indentation: CGFloat = 15,
lineSpacing: CGFloat = 3,
paragraphSpacing: CGFloat = 10,
textColor: UIColor = .black,
bulletColor: UIColor = .red) -> NSAttributedString {
func createParagraphAttirbute() -> NSParagraphStyle {
var paragraphStyle: NSMutableParagraphStyle
let nonOptions = NSDictionary() as! [NSTextTab.OptionKey: Any]
paragraphStyle = NSParagraphStyle.default.mutableCopy() as! NSMutableParagraphStyle
paragraphStyle.tabStops = [
NSTextTab(textAlignment: .left, location: indentation, options: nonOptions)]
paragraphStyle.defaultTabInterval = indentation
paragraphStyle.firstLineHeadIndent = 0
paragraphStyle.lineSpacing = lineSpacing
paragraphStyle.paragraphSpacing = paragraphSpacing
paragraphStyle.headIndent = indentation
return paragraphStyle
}
let bulletPoint = "\u{2022}"
let textAttributes: [NSAttributedStringKey: Any] = [.font: font, .foregroundColor: textColor]
let bulletAttributes: [NSAttributedStringKey: Any] = [.font: font, .foregroundColor: bulletColor]
let buffer = NSMutableAttributedString.init()
for string in strings {
let formattedString = "\(bulletPoint)\t\(string)\n"
let attributedString = NSMutableAttributedString(string: formattedString)
let paragraphStyle = createParagraphAttirbute()
attributedString.addAttributes(
[NSAttributedStringKey.paragraphStyle : paragraphStyle],
range: NSMakeRange(0, attributedString.length))
attributedString.addAttributes(
textAttributes,
range: NSMakeRange(0, attributedString.length))
let string:NSString = NSString(string: formattedString)
let rangeForBullet:NSRange = string.range(of: bulletPoint)
attributedString.addAttributes(bulletAttributes, range: rangeForBullet)
buffer.append(attributedString)
}
return buffer
}

Answer 2

Here's a simple Objective-C snippet, based mostly on the accepted answer:
NSString* text =
"•\tSome text for bullet 1.\n"
"•\tSome text for bullet 2.\n"
"•\tSome text for bullet 3."
UIFont* bodyFont = [UIFont preferredFontForTextStyle: UIFontTextStyleBody];
CGFloat indentSize = bodyFont.pointSize;
NSMutableParagraphStyle *paraStyle = [[[NSMutableParagraphStyle alloc] init];
paraStyle.alignment = NSTextAlignmentLeft;
paraStyle.tabStops = #[ [[[NSTextTab alloc] initWithTextAlignment:NSTextAlignmentLeft location:indentSize options:#{}] ];
paraStyle.defaultTabInterval = indentSize;
paraStyle.headIndent = indentSize;
paraStyle.firstLineHeadIndent = 0;
paraStyle.lineHeightMultiple = 0.85;
paraStyle.lineSpacing = 0;
paraStyle.paragraphSpacing = bodyFont.lineHeight * 0.25;
paraStyle.paragraphSpacingBefore = 0;
[atrStr appendAttributedString:
[[[NSMutableAttributedString alloc] initWithString:avc.message attributes:#{
NSParagraphStyleAttributeName:paraStyle,
NSFontAttributeName: bodyFont,
}]];