Add character or special character in NString? - iphone

Question

I have an NSString *string=#"606" and I want to add a ":" colon after two digits.
The output should look like this: 6:06
It this is possible?
Help would be appropriated.
Thank you very much.

Answer 1

You can add the column between the hours and the minutes like this:
NSString *string = #"606";
NSString *result = [string stringByReplacingCharactersInRange:NSMakeRange(string.length-2, 0) withString:#":"];
NSLog(#"%#", result);
This will give the following results
#"606" => #"6:06"
#"1200" => #"12:00"
#"1406" => #"14:30"
Note: This will only work if the string has 3 or 4 characters, but this is the case according to your question.

Answer 2

Because you do not have two separate objects for hours and minutes, use:
NSString *newTimeString, *hour, *minute;
NSUInteger length = [timeString length];
if (length == 3)
{
hour = [timeString substringToIndex:1];
minute = [timeString substringFromIndex:2];
}
else
{
hour = [timeString substringToIndex:2];
minute = [timeString substringFromIndex:3];
}
newTimeString = [NSString stringWithFormat:#"%#:%#", hour, minute];
I used a long version to illustrate the concept. Basically, use the length of the original string (timeString) to extract the time components and combine them with a colon.

Answer 3

Will it be 2 digits no matter what? Otherwise you could build your custom string from parameters.
NSString *string = [NSString stringWithFormat:#"%#:%#", hours, minutes];
UPDATE
If you just need to add a colon after 1 char, you can do it this way. Although I would suggest finding a safer method as this could be inaccurate if you have a double digit hour.
NSString *hour = [NSString substringToIndex:1]; // double check the index
NSString *min = [NSString substringFromIndex:1]; // double check the index
NSString *time = [NSString stringWithFormat:#"%#:%#", hour, min];
Hopefully this will help.