1.定义topview
@IBOutlet weak var topBarView: UIView!
2.设置topbarview 背景色
self.topBarView.backgroundColor = NAVBARCOLOR（全局uicolor自己设置）
3.navigationBar参数设置
navigationBar = UINavigationBar(frame: CGRectMake(0, 20, SCREEN_WIDTH, 44))
navigationBar?.setBackgroundImage(UIImage(), forBarMetrics: UIBarMetrics.Default)
navigationBar?.shadowImage = UIImage()
navigationBar?.translucent = true
self.topBarView.addSubview(navigationBar!)
4.设置navbar上的按钮控件
navigationBar?.pushNavigationItem(onMakeNavitem(), animated: true)
// 给顶部导航增加导航项
func onMakeNavitem() -> UINavigationItem {
let navigationItem = UINavigationItem()
let rightBtn = UIBarButtonItem(title: "保存", style: UIBarButtonItemStyle.Plain, target: self, action: #selector(EditViewController.savePost))
let leftBtn = UIBarButtonItem(title: "取消", style: UIBarButtonItemStyle.Plain, target: self, action: #selector(EditViewController.cancelPost))
// 设置导航栏标题
navigationItem.title = "编辑"
// left按钮
navigationItem.setLeftBarButtonItem(leftBtn, animated: true)
// right按钮
navigationItem.setRightBarButtonItem(rightBtn, animated: true)
return navigationItem
}