how to Change the name of bar button dynamically

Question

Can anyone please let me know how to convert the bar button item named as "save" to "update" in view controller while updating the data in table view controller. I am using ios 9, xcode 7.3 and swift 2.2.

I am providing the sample code for the bar button.

@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)")
        }

    }

Nirav D · Accepted Answer · 2016-08-11T11:32:43.483

4

Change title like this in your viewDidLoad

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

edited Aug 11 '16 at 11:32

answered Aug 11 '16 at 09:10

Nirav D

71,513
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161
183

I tried it but got the error as bool?cannot be used as boolean – Guru Teja Aug 11 '16 at 11:31
You have created your boolean with optional wrapping so either change your declaration of boolean like this `var isUpdate = false` or use `== true` with your if condition. – Nirav D Aug 11 '16 at 11:51

score 2 · Answer 2 · answered Aug 11 '16 at 09:22

2

You could make this in the viewDidLoad() method:

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

answered Aug 11 '16 at 09:22

Alessandro Ornano

34,887
11
106
133

I got the the error as but optional type"()" cannot be used as boolean – Guru Teja Aug 11 '16 at 11:33
Declare your boolean as var isUpdate : Bool = false and retry – Alessandro Ornano Aug 11 '16 at 11:35

how to Change the name of bar button dynamically

2 Answers2