swift - 导航控制器删除后退按钮箭头

Question

我在 swift 中有一个应用程序，其中视图控制器嵌入在导航控制器中，现在在第二个和第三个视图控制器中，在后退按钮上，有一个向后指向的蓝色箭头（默认情况下它在那里）。我试图删除它，但是当我想在那里有图像时，图像会全部被压扁。有谁知道您将如何删除后退按钮箭头并将其替换为图像？ 非常感谢！

Answer 1

使用这个....

设置文字：

let backBtn = UIBarButtonItem(title: "Back", style: UIBarButtonItemStyle.Plain, target: self, action: "BtnTapBack:")
navigationItem.leftBarButtonItem = backBtn
navigationItem.leftBarButtonItem?.setTitleTextAttributes([NSFontAttributeName: UIFont(name: "YourFontName", size: 20)!], forState: UIControlState.Normal)

设置图片：

let image = UIImage(named:"YourImageName") as UIImage!
var btnBack:UIButton = UIButton.buttonWithType(UIButtonType.Custom) as! UIButton
btnBack.addTarget(self, action: "BtnTapBack:", forControlEvents: UIControlEvents.TouchUpInside)
btnBack.setImage(image, forState: UIControlState.Normal)
btnBack.setTitleColor(UIColor.blueColor(), forState: UIControlState.Normal)
btnBack.sizeToFit()
var myCustomBackButtonItem:UIBarButtonItem = UIBarButtonItem(customView: btnBack)
self.navigationItem.leftBarButtonItem  = myCustomBackButtonItem

动作转到上一个视图控制器

@IBAction func BtnTapBack(sender: UIButton) {
        navigationController?.popViewControllerAnimated(true)
}