iOS中的backBarButtonItem (Swift)

Question

var backButton: UIBarButtonItem = UIBarButtonItem(title: "CUSTOM", style: UIBarButtonItemStyle.Bordered, target: self, action: nil)
    newNavigationItem.backBarButtonItem = backButton

newNavigationItem: UINavigationItem在哪里？

我想要自定义后置标题。它显示“返回”文本或“上次查看的标题”。所以它不起作用。为什么？

Answer 1

Yogesh Suthar说的方法将取代整个后退按钮，所以你不会有默认的左箭头符号！我建议使用以下代码：

navigationController?.navigationBar.topItem?.backBarButtonItem = backButton

Answer 2

使用leftBarButtomItem

newNavigationItem.backBarButtonItem = backButton

应该是

newNavigationItem.leftBarButtonItem = backButton

Answer 3

override func viewDidLoad() {
 super.viewDidLoad()
  let newBackButton = UIBarButtonItem(title: "Back",
         style: UIBarButtonItemStyle.Plain, target: self, action: "backAction")
    navigationController?.navigationBar.topItem?.backBarButtonItem = newBackButton

}

func backAction() -> Void {
    self.navigationController?.popViewControllerAnimated(true)
}