About AttributeString - making multiple occurrences bold

Question

I am trying to make multiple occurrences in a attributed string bold using something like the following

[attrStr setFont:[UIFont ...] range:[attrStr.string rangeOfString:@"hello world"]];

As you know, 'rangeOfString' always return the FIRST occurrence of the match... I am still quite new to iOS, just wondering what's the best way to set all occurrences to bold... Is there any function provided in NSString or something?

Thanks in advance!

Answer 1

You should first try to get all ranges in the string and then set the attribute for every range. There are some great code examples right here on stackoverflow: https://stackoverflow.com/a/4653266/381870

Edit:

Here's an example for you

- (NSArray *)rangesOfString:(NSString *)searchString inString:(NSString *)str {
    NSMutableArray *results = [NSMutableArray array];
    NSRange searchRange = NSMakeRange(0, [str length]);
    NSRange range;
    while ((range = [str rangeOfString:searchString options:0 range:searchRange]).location != NSNotFound) {
        [results addObject:[NSValue valueWithRange:range]];
        searchRange = NSMakeRange(NSMaxRange(range), [str length] - NSMaxRange(range));
    }
    return results;
}

Usage:

NSArray *results = [self rangesOfString:@"foo" inString:@"foo bar foo"];
NSLog(@"%@", results);

gives you

(
    "NSRange: {0, 3}",
    "NSRange: {8, 3}"
)