swift -自定义返回图片，替换系统图片backItem

 

隐藏系统返回按键

        
方法1：self.navigationItem.leftBarButtonItem = nil //隐藏自定义的itemself.navigationItem.hidesBackButton = true    //隐藏系统的item方法2：let item =  UIBarButtonItem(image: nil, style: UIBarButtonItem.Style.plain, target: nil, action: nil)self.navigationItem.leftBarButtonItems = [item]

　　 

 设置自定义返回按钮方法：

 /// 设置返回图片func setNavBackBtn(backType:JYBackBtnTypeEnum){var imageName = ""switch backType {case JYBackBtnTypeEnum.gray:imageName = "back_normal_gray"case JYBackBtnTypeEnum.white:imageName = "back_normal_white"}let item = UIBarButtonItem(image:  UIImage.init(named: imageName)?.withRenderingMode(UIImage.RenderingMode.alwaysOriginal), style: .plain, target: self, action: #selector(clcikBackBtn))self.navigationItem.leftBarButtonItems = [item]}//返回按钮点击响应@objc func clcikBackBtn(){self.navigationController?.popViewController(animated: true)}