Attributed string color- Objective-c - ios

Question

I have a display like in the picture
Im getting this from a string str which is like below
Code I have tried
lbl1.text=newStr;
NSString *textxtra = #"Xtra";
NSString *textremove = #"Remove";
NSMutableAttributedString *attrsString = [[NSMutableAttributedString alloc] initWithAttributedString:lbl1.attributedText];
// search for word occurrence
NSRange range = [lbl1.text rangeOfString:textxtra];
NSRange range1 = [lbl1.text rangeOfString:textremove];
if (range.location != NSNotFound) {
[attrsString addAttribute:NSForegroundColorAttributeName value:[UIColor systemGreenColor] range:range];
}
if (range1.location != NSNotFound) {
[attrsString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:range1];
}
// set attributed text
lbl1.attributedText = attrsString;
How to get the string before Xtra (American Cheese) and after Xtra($1) in green color ?
The part before Remove(House Mayo) in red color?
i.e The whole string American Cheese: Xtra $1 should be in green color.
I get the idea to take the string in between \n.
i.e string before Xtra upto \n and after Xtra upto \n
But couldn't understand exactly how to implement
Any ideas/suggestions will be helpful

Answer 1

Not tested, but this should do the trick:
NSString *initialSting = #"";
NSArray *lines = [initialSting componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];
NSMutableArray *attributedLines = [[NSMutableArray alloc] init];
NSDictionary *redAttributes = #{};
NSDictionary *greenAttributes = #{};
for (NSString *aLine in lines)
{
NSAttributedString *aLineAttributedString;
//Here, you could also check, that the string is like "someString: Xtra someOtherString", because if Xtra is misplaced...
if ([aLine containsString:#"Xtra"])
{
aLineAttributedString = [[NSAttributedString alloc] initWithString:aLine attributes:greenAttributes];
//Here, you could also check, that the string is like "someString: Remove someOtherString", because if Remove is misplaced...
}
else if ([aLine containsString:#"Remove"])
{
aLineAttributedString = [[NSAttributedString alloc] initWithString:aLine attributes:redAttributes];
}
else
{
aLineAttributedString = [[NSAttributedString alloc] initWithString:aLine];
}
[attributedLines addObject:aLineAttributedString];
}
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] init];
NSAttributedString *newLine = [[NSAttributedString alloc] initWithString:#"\n"];
if ([attributedLines count] > 0)
{
for (NSUInteger i = 0; i < [attributedLines count] - 1; i++)
{
[attributedString appendAttributedString:attributedLines[i]];
[attributedString appendAttributedString:newLine];
}
[attributedString appendAttributedString:[attributedLines lastObject]];
}
The logic:
Get an array of NSString for each line with componentsSeparatedByCharactersInSet:
Create an array of NSAttributedString, that will be populated for each line.
For each line, color it if needed, then add it to the array.
Finally, there is no componentsJoinedByString: for NSAttributedString, so do a manual for loop to reconstruct the final NSAttributedString.