swift -自定义返回图片，替换系统图片backItem

 

隐藏系统返回按键

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方法1：         self.navigationItem.leftBarButtonItem = nil //隐藏自定义的item         self.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：

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/// 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)    }