How to get all NSRange of a particular character in a NSString?

Question

I have two NSStrings: orgText and searchLetter.
I want to highlight every occurrences of the searchLetter in the orgText with a red color.
How can I get the NSRange of all occurrences of the searchLetter ?
for eg :

suppose: orgText = "abcahaiapaoiuiapplma"
         searchLetter = "a".

I want to hightlight all "a" occurrences in "abcahaiapaoiuiapplma" with red color.
Thanks.

Volodymyr B. · Accepted Answer · 2014-08-26T08:54:46.937

56

I wrote this method for my project - SUITextView with highlight:

- (NSMutableAttributedString*) setColor:(UIColor*)color word:(NSString*)word inText:(NSMutableAttributedString*)mutableAttributedString {

    NSUInteger count = 0, length = [mutableAttributedString length];
    NSRange range = NSMakeRange(0, length);

    while(range.location != NSNotFound)
    {
        range = [[mutableAttributedString string] rangeOfString:word options:0 range:range];
        if(range.location != NSNotFound) {
            [mutableAttributedString setTextColor:color range:NSMakeRange(range.location, [word length])];
            range = NSMakeRange(range.location + range.length, length - (range.location + range.length));
            count++; 
        }
    }

    return mutableAttributedString;
}

And in my category of NSMutableAttributedString:

- (void) setTextColor:(UIColor*)color range:(NSRange)range {
    // kCTForegroundColorAttributeName
    [self removeAttribute:(NSString*)kCTForegroundColorAttributeName range:range]; // Work around for Apple leak
    [self addAttribute:(NSString*)kCTForegroundColorAttributeName value:(id)color.CGColor range:range];
}

edited Aug 26 '14 at 08:54

answered Dec 16 '11 at 12:05

Volodymyr B.

3,369
2
30
48

I think there's an extra "}" floating around, but working great still in '14 – dacopenhagen Aug 25 '14 at 23:46
@dacopenhagen you are right. that method was written for multiple words :) – Volodymyr B. Aug 26 '14 at 08:53
1

What's the point of count? To see how many occurrences you've replaced while debugging? – Ruiz Feb 19 '15 at 15:11
1

For me (iOS 7) it only worked with other kinds of arguments in that category method. `NSForegroundColorAttributeName` instead of `kCTForegroundColorAttributeName` and a `UIColor` object instead of its `CGColor` property. – anneblue Jul 15 '15 at 13:34

score 7 · Answer 2 · answered Jun 20 '14 at 10:21

I'm not seeing any solution with regular expression, so I've created an elegant one, it may be useful for someone in the future.

- (BOOL)highlightString:(NSString *)string inText:(NSMutableAttributedString *)attributedString withColour:(UIColor *)color {
    NSError *_error;
    NSRegularExpression *_regexp = [NSRegularExpression regularExpressionWithPattern:string options:NSRegularExpressionCaseInsensitive error:&_error];
    if (_error == nil) {
        [_regexp enumerateMatchesInString:attributedString.string options:NSMatchingReportProgress range:NSMakeRange(0, attributedString.string.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
            if (result.numberOfRanges > 0) {
                for (int i = 0; i < result.numberOfRanges; i++) {
                    [attributedString addAttribute:NSBackgroundColorAttributeName value:color range:[result rangeAtIndex:i]];
                }
            }
        }];
        return TRUE;
    } else {
        return FALSE;
    }
}

score 2 · Answer 3 · edited Dec 15 '16 at 06:49

2

Code crash at "setTextColor" for MutableAttributeString

instead of it use below code

NSDictionary *tempdict=[NSDictionary dictionaryWithObjectsAndKeys:[UIFont boldSystemFontOfSize:12.0],NSFontAttributeName,color,NSForegroundColorAttributeName, nil];
[mutableAttributedString setAttributes:tempdict range:NSMakeRange(range.location, [word length])];

edited Dec 15 '16 at 06:49

Fahim Parkar

30,974
45
160
276

answered Feb 05 '13 at 10:53

user1073831

63
8

score -1 · Answer 4 · answered Sep 01 '15 at 10:54

-1

this is an easier way of doing it

NSString *str = @"hello world";
NSMutableAttributedString *attr = [[NSMutableAttributedString alloc] initWithString:str];
[attr addAttributes:@{NSForegroundColorAttributeName : [UIColor redColor]} 
              range:[str rangeOfString:@"world"]];

answered Sep 01 '15 at 10:54

abbood

23,101
16
132
246

NOTE:this would only add attributes to the first substring occurrence – Michał Zygar Sep 25 '15 at 07:48

How to get all NSRange of a particular character in a NSString?

4 Answers4

Linked

Related