1.获取当前控制器
nav.topViewController
2.设置导航栏背景透明
self.navigationBar.setBackgroundImage(UIImage(),for: .default)
self.navigationBar.shadowImage = UIImage()
3.设置导航条 标题颜色、大小
self.navigationBar.titleTextAttributes = [NSAttributedStringKey.font: font,NSAttributedStringKey.foregroundColor: titleColor] as [NSAttributedStringKey : Any]
4.设置导航栏背景图片
let bgImage = UIImage(named: imageName!)?.resizableImage(withCapInsets: UIEdgeInsetsMake(0, 0, 0, 0), resizingMode: .stretch)
self.navigationBar.setBackgroundImage(bgImage, for: .default)
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