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Xcode – How to add more strings to the combined string if the length is less than prescribed length?

In iOS I am using two strings to combine and to form a single string. But the combined string must be of 16 characters . So if two strings are small and if we combine both and if it is less than 16 characters I must add few more characters to make it to 16 characters. How to achieve this?

NSString *combined = [NSString stringWithFormat:@"%@%@", stringURL, stringSearch];

This is the code I am using. So if I combine and it is less than 16 characters how to calculate it and add more characters to make it 16 characters?

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2

Answers


  1. 0

    Something like below

    NSString *combined = [NSString stringWithFormat:@"%@%@", stringURL, stringSearch];
if (combined.length < 16)
{
    NSString *newCombined = [NSString stringWithFormat:@"%@%@", combined, @"Some new string"];
}

    You can use substringWithRange: method from NSString. You can take the below code as an example and modify it as per your requirements.

    if (combined.length > 25)
{
    NSString *beginning = [combined substringWithRange:NSMakeRange(0, 15)];
    NSString *fromEnd = [combined substringWithRange:NSMakeRange(startPoint, combined.length-startPoint)];
}
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  2. 0

    You could make use of stringWithFormat – basically of printf if you want to pad with just a single char. Below I give some examples which I have constructed to illustrate, so it won’t run out the box, but you only need to comment out the ones you do not want to make it work.

            // To get 50 spaces
        NSString * s50 = [NSString stringWithFormat:@"%*s", 50, ""];

        // Pad with these characters, select only 1

        // This will pad with spaces
        char * pad = "";

        // This will pad with minuses - you need enough to fill the whole field
        char * pad = "-------------------------------------------------------";

        // Some string
        NSString * s = @"Hi there";

        // Here back and front are just int's. They must be, but they can be calculated,

        // e.g. you could have this to pad to 50
        int back = 50 - s.length; if ( back < 0 ) back = 0;

        // Pad s at the back
        int back = 20;
        NSString * sBack = [NSString stringWithFormat:@"%@%*s", s, back, pad];

        // Pad s in front
        int front = 10;
        NSString * sFront = [NSString stringWithFormat:@"%*s%@", front, pad, s];

        // Pad s both sides
        NSString * sBoth = [NSString stringWithFormat:@"%*s%@%*s", front, pad, s, back, pad];

    Note that the amounts here are parameterised. I use e.g. 50 in the first line but that could just as well be n as long as n is an int and you can use that to then perform calculations, store it in n and pad. There is an example in the code.

    Here is a sample of the output

    2020-11-04 08:16:22.908828+0200 FormatSpecifiers[768:15293] [Hi there-------------------------------------------------------]
2020-11-04 08:16:22.908931+0200 FormatSpecifiers[768:15293] [-------------------------------------------------------Hi there]
2020-11-04 08:16:22.908992+0200 FormatSpecifiers[768:15293] [-------------------------------------------------------Hi there-------------------------------------------------------]

    I just show how to pad the combined string. To combine the string of course just use stringByAppendingString e.g.

    NSString * s = [a stringByAppendingString:b];

    and then you can do calcs based on s.length e.g. as shown in the example.

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