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Answered
Louis Oliva
Asked: 2022-08-12T13:02:54+00:00

Change string color with NSAttributedString?

I have a slider for a survey that display the following strings based on the value of the slider: “Very Bad, Bad, Okay, Good, Very Good”.

Here is the code for the slider:

- (IBAction) sliderValueChanged:(UISlider *)sender {
    scanLabel.text = [NSString stringWithFormat:@" %.f", [sender value]];
    NSArray *texts=[NSArray arrayWithObjects:@"Very Bad", @"Bad", @"Okay", @"Good", @"Very Good", @"Very Good", nil];
    NSInteger sliderValue=[sender value]; //make the slider value in given range integer one.
    self.scanLabel.text=[texts objectAtIndex:sliderValue];
}

I want “Very Bad” to be red, “Bad” to be orange, “Okay” to be yellow, “Good” and “Very Good” to be green.

I don’t understand how to use NSAttributedString to get this done.

coca-touchiosnsattributedstring
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2 Answers

  1. There is no need for using NSAttributedString. All you need is a simple label with the proper textColor. Plus this simple solution will work with all versions of iOS, not just iOS 6.

    But if you needlessly wish to use NSAttributedString, you can do something like this:

    UIColor *color = [UIColor redColor]; // select needed color
NSString *string = ... // the string to colorize
NSDictionary *attrs = @{ NSForegroundColorAttributeName : color };
NSAttributedString *attrStr = [[NSAttributedString alloc] initWithString:string attributes:attrs];
self.scanLabel.attributedText = attrStr;
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  2. Best Answer

    Use something like this (Not compiler checked)

    NSMutableAttributedString *string = [[NSMutableAttributedString alloc]initWithString:self.text.text];
NSRange range=[self.myLabel.text rangeOfString:texts[sliderValue]]; //myLabel is the outlet from where you will get the text, it can be same or different

NSArray *colors=@[[UIColor redColor],
                  [UIColor redColor],
                  [UIColor yellowColor],
                  [UIColor greenColor]
                 ];

[string addAttribute:NSForegroundColorAttributeName 
               value:colors[sliderValue] 
               range:range];           

[self.scanLabel setAttributedText:texts[sliderValue]];
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