Creating random number in Xcode/SpriteKit

Im trying to Create a game in which a projectile is launched at a random angle. To do this I need to be able to generate two random Int's, I looked up some tutorials and came up with this:

    var random = CGFloat(Int(arc4random()) % 1500)
    var random2 = CGFloat(Int(arc4random()) % -300)
    self.addChild(bullet)
    bullet.physicsBody!.velocity = CGVectorMake((random2), (random))

It worked for a while but now it just crashes.

Any help would be appreciated.