RightBarButtonItem未显示在正确的位置

Question

我正在以编程方式创建一个UINavigationController并将我的ViewController添加到它：

// wrap in a navigation controller
let navigationController = UINavigationController(rootViewController: myViewController)
self.present(navigationController, animated: true, completion: nil)

然后将图像添加到导航项目：

let backButton: UIBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: target, action: selector)
backButton.image = UIImage(named: "ic_back")
self.navigationItem.rightBarButtonItem = backButton

但我的BarButton没有显示在正确的位置。我做错了什么？

Answer 1

您需要将UIBarButton直接初始化为UIImage或自定义视图：

即，

Swift 3.0：

let image = UIImage(named: "ic_back")?.withRenderingMode(.alwaysOriginal)
let button = UIBarButtonItem(image: image, style: .plain, target: target, action: selector) 

self.navigationItem.rightBarButtonItem = button

这将解决您的问题。

Answer 2

使用所需的帧分配和初始化UIButton！将图像设置为该按钮。如果需要，设置内容模式！在此按钮上添加目标以处理点击！然后使用alloc and init方法UIBarButtonItem initWithCustomView并将UIButton作为您创建的参数传递。

然后将navigationItem的rightBarbuttonItem设置为此barbutton！

Answer 3

let btn1 = UIButton(type: .custom)
btn1.setImage(UIImage(named: "imagename"), for: .normal)
btn1.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
btn1.addTarget(self, action: #selector(Class.Methodname), for: .touchUpInside)
let item1 = UIBarButtonItem(customView: btn1)

self.navigationItem.setRightBarButtonItems(item1, animated: true)

Answer 4

您可以像这样在导航栏上设置按钮..

let Button = UIButton(frame: CGRect(x: 0, y: 0, width: 35, height: 40))
    Button.setBackgroundImage(UIImage(named: "btn.png"), for: .normal)
    self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: Button)

因此，此代码可帮助您实现查询

Answer 5

使用以下代码将框架添加到backButton，并告诉我们它是否有效。

backButton.frame = CGRect(x: 0, y: 0, width: 50, height: 50)

您可以更改宽度和高度acc。根据你的需要。