first-responder

I understand that a first responder object is the receives a callback signal according to input activity, etc and that it will bubble it up the chain until a responder willing to handle it can be found. But more formally, what is the scope of the first responder? For instance, is it an application-wide responder? It seems like being a first responder is simply saying that this particular object will receive notification of interaction. Can another responder steal the first responder status? Please explain or direct me to some pertinent information. I've read Apple's general explanation of what

I have an iOS 6-based project that implements a UITableView . Each cell in the table view contains a UITextField allowing the user to enter information. If the user clears a text field, or deletes all input from the field, (i.e. [textfield length] == 0 ) when they tap onto another cell (text field) it deletes the previous cell (text field) from the table view, as it's empty - this avoids empty cells accumulating in the table view. This is all done using a method called -textFieldEditingDidEnd: which fires on the UIControlEventEditingDidEnd event for the text fields: - (void

I would like to get the view that is the first responder, currently I have a UITableView that contains UITextFields, using a method: -(UIView*) findFirstResponder { } I would like to be able to get the view that is the firstResponder and then do something with that view. Any ideas? All I had to do was @implementation UIView (FindViewThatIsFirstResponder) - (UIView *)findViewThatIsFirstResponder { if (self.isFirstResponder) { return self; } for (UIView *subView in self.subviews) { UIView *firstResponder = [subView findViewThatIsFirstResponder]; if (firstResponder != nil) { return firstResponder

I'd like to change the background image of a UITextField when it becomes the firstResponder to show the user that it has focus, similar to the :active or :focus pseudo-classes in CSS. I'm guessing that I may need to do this programmatically; so any help is greatly appreciated. -Giles You might as well use the UITextFieldDelegate methods (IMHO, easier to maintain than key-value observers): #pragma mark - #pragma mark UITextFieldDelegate methods - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField { _field.background = [UIImage imageNamed:@"focus.png"]; return YES; } - (BOOL

How do you write first responder unit tests? I'm trying to write a test to confirm that a method advances focus to the next text field. controller is a descendant of UIViewController . But this exploratory test fails: - (void)testFirstResponder { [controller view]; [[controller firstTextField] becomeFirstResponder]; STAssertTrue([[controller firstTextField] isFirstResponder], nil); } The first line causes the view to be loaded so that its outlets are in place. The text fields are non-nil. But the test never passes. I'm guessing that becomeFirstResponder doesn't set the first responder right

I have set a custom inputView to my UITextField . I need a way to display the data selected in my custom inputView in the UITextfield . I would like to achieve this the same way the system keyboard does it. Does anyone know how this is done? How does the system keyboard get a reference to the UITextfield that is the first responder? How does the system keyboard get a reference to the UITextfield that is the first responder? It just asks the system for the first responder; unfortunately, that's a private UIKit method (or was, last I checked). You can find the first responder by recursing

I am using this other SO answer for adding UITextField s to my UITableViewCell s. However, I am now at a loss how I can let the user focus on the next item by using the next button. Any hints? Anh Do Try assigning a tag to each UITextField. Once the Next button is pressed, calculate the next tag and use [[UIView viewWithTag:nextTag] becomeFirstResponder] to change the focus to the next text field. This worked well for me, would have to be tweaked to fit your needs though: #pragma mark - UITextField Delegate - (BOOL)textFieldShouldReturn:(UITextField *)textField { HRCFormCell * currentCell =