Question

As the title said, I need to format a string of text in format like: “HELLO, WORLD. HOW ARE YOU?” into “Hello, world. How are you?”, is there any standard method for doing this in iOS? Or is there any sample code ?

Thanks!

Answer 1

There is no direct way to capitalize the first characters of sentences in a paragraph. NSString just has a method capitalizedString which capitalizes each and every word. You have to create your own logic to achieve this. You can try the following code.

- (NSString *)captilizeParagraph:(NSString *)paragraph {

    if ([paragraph length] == 0) return paragraph;
    NSArray *sentences = [paragraph componentsSeparatedByString:@". "];
    NSMutableArray *capitalizedSentences = [NSMutableArray array];

    for (NSString *sentence in sentences) {

        sentence = [sentence lowercaseString];
        sentence = [sentence stringByReplacingCharactersInRange:NSMakeRange(0,1) withString:[[sentence substringToIndex:1] uppercaseString]];
        [capitalizedSentences addObject:sentence];
    }

    NSString *capitalizedParagrah = [capitalizedSentences componentsJoinedByString:@". "];
    return capitalizedParagrah;
}

Note: The above code assumes that all the sentences in the paragraph ends with characters ". " (a dot and a space) except the last sentence(it can end with any character). If a sentence ends with some other characters like "? " or "! ", then this method will return a not-fully-formatted string.