CODEWITHSUNDEEP
swift
user6794148
user6794148

Reputation: 17

How do I randomize a position negatively?

So I have to randomize an x position. But for some reason the middle is 0 and therefore I need to do negative max x and positive max x. It's a little hard to explain so here is the code:

let height = UInt32(self.view!.frame.height)
    let nHeight = ((height - height) - height)

    let randomXPosition = Int(arc4random_uniform(UInt32(nHeight)) + height)

This doesn't give me any errors but when I run it crashes. I need a way to randomize the value for negative max X and positive max X so that the object is randomized in the screen.

Upvotes: 0

Views: 47

Answers (1)

creeperspeak
creeperspeak

Reputation: 5521

If you need to generate a random number between -x and x then just create a random number between 0 and 2x and subtract x. arc4random_uniform(x * 2) - x.

Upvotes: 3

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