如何动态更改条形按钮的名称

Question

任何人都可以告诉我如何在更新 table 视图控制器中的数据时将视图控制器中名为 "save" 的条形按钮项目转换为 "update"。我正在使用 ios 9、xcode 7.3 和 swift 2.2.

我正在提供栏按钮的示例代码。

@IBAction func save(sender: UIBarButtonItem) {

//func Plus(sender: AnyObject) {

    if isUpdate == true{
        print("object id \(self.store?.objectID)")
        self.store?.sTitle = titlename.text
        self.store?.sNote = note.text
        //save.setTitle("my text here", forState: .Normal)
        let img = UIImage(named: "image.jpg")
        let imgData = UIImageJPEGRepresentation(img!,1)
        self.store?.sImage = imgData
        do {
            try appdelegate.managedObjectContext.save()
            self.navigationController?.popViewControllerAnimated(true)
        } catch let error as NSError  {
            print("Could not save \(error), \(error.userInfo)")
        }

    }else{
        //get the description of the entity
        let storeDescription = NSEntityDescription.entityForName("Store",inManagedObjectContext: appdelegate.managedObjectContext)

        //we create managed object to be inserted to core data
        let store = EventsandnotesStore(entity : storeDescription!,insertIntoManagedObjectContext:appdelegate.managedObjectContext)
        store.sTitle = titlename.text
        store.sNote = note.text

        let img = UIImage(named: "image.jpg")
        let imgData = UIImageJPEGRepresentation(img!,1)

       store.sImage = imgData
        do {
            try appdelegate.managedObjectContext.save()
            self.navigationController?.popViewControllerAnimated(true)
        } catch let error as NSError  {
            print("Could not save \(error), \(error.userInfo)")
        }

    }

Answer 1

在您的 viewDidLoad

中像这样更改标题

if (isUpdate == true) {
    let item = self.navigationItem.rightBarButtonItem
    item?.title = "Update"
}

Answer 2

您可以在 viewDidLoad() 方法中进行此操作：

if let item = self.navigationItem.rightBarButtonItem {
      item.title = isUpdate ? "Update" : "Save"
}

如何动态更改条形按钮的名称

how to Change the name of bar button dynamically

xcode

rightbarbuttonitem

ios

swift