Change Colour of Small Words ('in') in UITextView using NSMutableAttributedString - ios

Question

I'm using NSMutableAttributedString to change the text in a UITextView as the user types. When the user types '#HELLO#' or "#TEST#" or '#test#', those strings should be red (just an example).
- (void)textViewDidChange:(UITextView *)textView
{
NSString *textViewText = textView.text;
NSMutableAttributedString * string = [[NSMutableAttributedString alloc]initWithString:textViewText];
NSString *space = #" ";
NSArray *words =[textView.text componentsSeparatedByString:space];
for (NSString *word in words) {
if ([word isEqualToString:#"#HELLO#"] || [word isEqualToString:#"#TEST#"] || [word isEqualToString:#"#test#"]) {
NSRange range=[textView.text rangeOfString:word];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:range];
}
else{
NSRange range=[textView.text rangeOfString:word];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor whiteColor] range:range];
}
}
[string addAttribute:NSFontAttributeName
value:[UIFont fontWithName:#"HelveticaNeue-Light" size:20.0]
range:NSMakeRange(0, [textView.text length])];
[textView setAttributedText:string];
}
This works for almost every word, except 'in'. When I type that, 'in' is black rather than white ([UIColor whiteColor]). If I type 't', the 't' in "#test#' turns white.
I'm really confused, can somebody help me out? I thought the else part should catch these strings. Thanks.

Answer 1

I tried your code. I guess the issue is the range you are setting . Because it is always one word it sets color attribute of the first occurrence of that particular word . Whether it be #HELLO# or in . Try typing a particular string repeatedly separated by space you will always get the same output. I have made a few changes in your code and you can see it below . Try it out.
- (void)textViewDidChange:(UITextView *)textView
{
NSString *textViewText = textView.text;
NSLog(#"Text view Text %#" , textViewText );
NSMutableAttributedString * string = [[NSMutableAttributedString alloc]initWithString:textViewText];
NSString *space = #" ";
NSArray *words =[textView.text componentsSeparatedByString:space];
for(NSString *word in words){
NSLog(#"WORD %#" , word);
if ([word isEqualToString:#"#HELLO#"] || [word isEqualToString:#"#TEST#"] || [word isEqualToString:#"#test#"]) {
NSRange range = NSMakeRange(0, string.length);
while(range.location != NSNotFound)
{
range = [[string string] rangeOfString:word options:0 range:range];
if(range.location != NSNotFound)
{
[string addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(range.location, word.length)];
range = NSMakeRange(range.location + range.length, string.length - (range.location + range.length));
}
}
}
else{
NSRange range = NSMakeRange(0,string.length);
while(range.location != NSNotFound)
{
range = [[string string] rangeOfString:word options:0 range:range];
if(range.location != NSNotFound)
{
[string addAttribute:NSForegroundColorAttributeName value:[UIColor whiteColor] range:range];
range = NSMakeRange(range.location + range.length, string.length - (range.location + range.length));
}
}
}
}
[string addAttribute:NSFontAttributeName
value:[UIFont fontWithName:#"HelveticaNeue-Light" size:20.0]
range:NSMakeRange(0, [textView.text length])];
[textView setAttributedText:string];
}