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1. 关于更改navigationBar 透明
//此方法封装navigationBar背景透明,然后设置背景色
func navigationBarBackGround(red:CGFloat, green:CGFloat, blue:CGFloat, alpha:CGFloat) {
currentMenu?.navigationBar.setBackgroundImage(UIImage(), for: .default)
currentMenu?.navigationBar.shadowImage = UIImage()
currentMenu?.navigationBar.isTranslucent = true
currentMenu?.navigationBar.backgroundColor = UIColor.init(red: red/255.0, green: green/255.0, blue: blue/255.0, alpha: alpha)
}