Question

我有一个带3个孩子的TabViewController（2个TableViewControllers和一个带Label和TextView的ViewController）

我已经向导航中添加了一个RightBarButtonItem，但问题是Bar Button没有触发..

经过一些实验后，我注意到只有当所选视图是ViewController时，并且只有在编辑TextView时，才会触发条形按钮。如果TextView已完成编辑，或者所选视图是TableViewControllers之一，则Bar Button不会触发

这是我的TabViewController类

class InfoTabViewController: UITabBarController, UITabBarControllerDelegate {

var index: Int?
var rightBarItem: UIBarButtonItem?

override func viewDidLoad() {
    super.viewDidLoad()

    // MARK: RightBarButtonItem
    rightBarItem = UIBarButtonItem()
    rightBarItem!.style = .Plain
    rightBarItem!.action = #selector(self.rightBarItemSelected)
    self.navigationItem.rightBarButtonItem = rightBarItem


    self.delegate = self
}

override func viewDidAppear(animated: Bool) {
    // MARK: RightBarButtonItem
    editRightBarItem()
}

//Useless, fires before the tabbar item is selected not after... go to TabBarController instead
override func tabBar(tabBar: UITabBar, didSelectItem item: UITabBarItem) {
    //print(self.selectedViewController?.title)
}

// UITabBarControllerDelegate fires after the tabbar item is selected, good one
func tabBarController(tabBarController: UITabBarController, didSelectViewController viewController: UIViewController) {
    editRightBarItem()
}

// MARK: RightBarButtonItem
func editRightBarItem() {
    if let title = self.selectedViewController?.title {
        switch title {
            case "Tab Investigations":
                rightBarItem!.title = "Add"

                //rightBarItem!.enabled = true
                break
            case "Tab Treatment":
                rightBarItem!.title = "Add"
                //rightBarItem!.enabled = true
                break
            case "Tab Images":
                rightBarItem!.title = "Add"
                //rightBarItem!.enabled = true
                break
            case "Tab Notes":
                rightBarItem!.title = "Save"
                //rightBarItem!.enabled = true
                break
            default:
                break
        }
    }
}

// MARK: RightBarButtonItem
func rightBarItemSelected() {
    print("right bar item selected")
    if let title = self.selectedViewController?.title {
        print(title)
        switch title {
        case "Tab Investigations":
            getInput(title, title: "New Test", message: "Insert Name and Value")
            break
        case "Tab Treatment":
            getInput(title, title: "New Drug", message: "Insert Name and Dose")
            break
        case "Tab Images":
            // do something
            break
        case "Tab Notes":
            let view = self.viewControllers![0] as! NotesViewController
            Patient.lstPatients[index!].history = view.textboxNotes.text
            view.textboxNotes.endEditing(true)
            //getInput("Add new test", message: "Insert name and value", viewTitle: self.selectedViewController!.title!)
            break
        default:
            break
        }
    }
}

Answer 1

按钮未触发的原因 - 您忘记设置target。以下是文档中的一些词语：

weak var target: AnyObject? { get set }

该对象   选择项目时接收操作。如果为零，则为动作   消息被传递到响应者链，在那里它可以被处理   实现与选择器所对应的方法对应的任何对象   动作属性。默认值为nil。

所以，尝试添加

rightBarItem.target = self

或使用更宽的初始化程序

rightBarItem = UIBarButtonItem(title: "Add", style: .Plain, target: self, action: #selector(self.rightBarItemSelected))

除非正在编辑子视图中的textView，否则TabViewController中的RightBarItem不会触发

1 个答案: