iPhone – Set or change title of UIBarButtonItem

Now this is very trivial and does not need a lot of work. I had googled for this but got some not so good answers so I tried out something and it works fine.

So basically what we are trying to achieve here is:

1) First create a UIBarButtonItem and put it in navigation.

2) Changing the title of the BarButtonItem on tap.

We do this by first declaring the button (in this case, the title is ‘Edit’) and attach a function to it which basically does something and also changes the Button Label to ‘Done’.

So lets first add the button on view load:


self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Edit" style:UIBarButtonItemStyleBordered target:self action:@selector(alterMode) ];


So the action ‘alterMode’ is now attached with the rightBarButtonItem. Now we just need our altermode method to change the title of the button and we are done.


-(void) alterMode {
  if(self.navigationItem.rightBarButtonItem.title == @"Edit") {
    //Do your stuff;
    self.navigationItem.rightBarButtonItem.title = @"Done";
  }
  else{
    //Do your stuff;
    self.navigationItem.rightBarButtonItem.title = @"Edit";
  }
}


That is all you need to do. Try it out. Hope it helps someone out there.

iPhone: TextField custom textDidChange action

While working on a project, I came across a requirement where I was required to fire an action on textfield text change. I did not find any method that apple provides like it does for searchbar text change. With some research on google, I went ahead and created a custom method which was then added on textfield event change namely UICOntrolEventEditingChanged.

This was what I did to make it work.

In ViewDidLoad, I added the following code:


[myTextfield addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UICOntrolEventEditingChanged];


Here I am attaching ‘textFieldDidChange’ method which will be called once the text in the myTextfield changes. I named it like this to make it sound more like the method for searchbar textchange method.

The actual method is:

-(void)textFieldDidChange {
// whatever you wanted to do
someLabel.text = myTextfield.text;
}