swift随机色的设置

var color:CGFloat = CGFloat(CGFloat(random())/CGFloat(RAND_MAX))

var color1:CGFloat = CGFloat(CGFloat(random())/CGFloat(RAND_MAX))

var color2:CGFloat = CGFloat(CGFloat(random())/CGFloat(RAND_MAX))

var color3:CGFloat = CGFloat(CGFloat(random())/CGFloat(RAND_MAX))

self.view.backgroundColor= UIColor(red: color,green: color1,blue: color2,alpha: 1);