[Swift]UIColorからrgb取得
UIColorからrgb値取得
func getColorTupleByUIColor(color:UIColor) -> (r:CGFloat,g:CGFloat,b:CGFloat){
var r:CGFloat = 0
var g:CGFloat = 0
var b:CGFloat = 0
var a:CGFloat = 0
color.getRed(&r, green: &g, blue: &b, alpha: &a)
return (r: r, g: g, b: b)
}