Equivalent of JavaScript's toString(16) in iOS using Obj-C

My goal is to create a unique hex id string using a random number. I accomplish this in JavaScript with the following code:

var id = (
    Math.random() * Math.pow(10, 17) +
    Math.random() * Math.pow(10, 17) +
    Math.random() * Math.pow(10, 17) +
    Math.random() * Math.pow(10, 17)
).toString(16);

This results in a random id such as: "2d50e9b4835d7e0".

I am now looking for a similar method in iOS that can generate a string of the same length (15 characters). Does anyone know of an iOS function that can achieve this?

javascriptiosobjective-cmathrandom

Answer №1

To generate a random number in Objective C, you can use the following code snippet:

-(int)getRandomNumberBetween:(int)from to:(int)to {
    return (int)from + arc4random() % (to-from+1);
}

Update: I have made changes to this method in order to obtain a hexadecimal string.

- (NSString *)getHexString
{   
    NSString *longString = [NSString stringWithFormat:@"%d%d%d%d%d%d",[self getRandomNumberBetween:100 to:999],[self getRandomNumberBetween:100 to:999],[self getRandomNumberBetween:100 to:999],[self getRandomNumberBetween:100 to:999],[self getRandomNumberBetween:100 to:999],[self getRandomNumberBetween:100 to:999]];
    long long longNumber = [longString longLongValue];
    NSString *hexadecimalStr =  [NSString stringWithFormat:@"%llx",longNumber];
    NSLog(@"%@",hexadecimalStr);
     return hexadecimalStr;
}

Therefore, your code will now resemble the following:

NSString *hexadecimalStr = [self getHexString];

You can customize it based on your requirements, as it provides a 15-digit hexadecimal value.

Answer №2

After some investigation, I managed to figure out how to solve this problem:

#define customPow pow(3, 19)

long long value = ((
    rand() * customPow +
    rand() * customPow +
    rand() * customPow +
    rand() * customPow
));

NSString *uniqueId = [[NSString alloc] initWithFormat:@"%llx", value];

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