//返回一个RGB颜色
class func getColor(r:CGFloat,g:CGFloat,b:CGFloat,l:CGFloat = 1) ->UIColor{
let color = UIColor(red: r/255.0, green: g/255.0, blue: b/255.0, alpha: l)
return color
}
//返回一个RGB颜色
class func getColor(str:Int,l:CGFloat = 1) ->UIColor{
//[self.tabBar setTintColor:[UIColor getColor:0x535353]];//用法
return UIColor(red:CGFloat((str & 0xFF0000) >> 16) / 255.0,green: CGFloat((str & 0x00FF00) >> 8) / 255.0,blue: CGFloat(str & 0x0000FF) / 255.0,alpha: CGFloat(l))
}