Event for dismissing onscreen keyboard by clicking the keyboard button - iphone

Question

I've been looking everywhere... maybe i'm not using the right searchwords since i do believe this is a common question.
Is there an event i can handle for when the user dismisses the keyboard by clicking the button to lower the keyboard.
i move a view up when a uitextfield becomes firstresponder but i want to move it down again when this button is tapped

Answer 1

Try using notifications. Add that to your viewDidLoad:
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
and then create a method called keyboardWillHide:
- (void)keyboardWillHide:(NSNotification *)notification {
//do whatever you need
}
Hope it helps

Answer 2

Check out the second paragraph in the "Managing Keyboard" section: http://developer.apple.com/library/ios/DOCUMENTATION/UIKit/Reference/UITextField_Class/Reference/UITextField.html

Answer 3

By using NSNotificationCenter you get Keyboard events.You can register for keyboard events in viewWillAppear and don't forget to unregister in viewWillDisapper.
We will use here two notifications :
UIKeyboardDidShowNotification apple docs
UIKeyboardDidHideNotification apple docs
You can do some thing like this:
(void) viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
NSLog(#"Registering for keyboard events");
// Register for the events
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:#selector (keyboardDidShow:)
name: UIKeyboardDidShowNotification
object:nil];
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:#selector (keyboardDidHide:)
name: UIKeyboardDidHideNotification
object:nil];
// Setup content size
scrollview.contentSize = CGSizeMake(SCROLLVIEW_CONTENT_WIDTH,
SCROLLVIEW_CONTENT_HEIGHT);//for e.g. (320,460)
//Initially the keyboard is hidden
keyboardVisible = NO;//in .h declare BOOL keyboardVisible;
}
-(void) viewWillDisappear:(BOOL)animated {
NSLog (#"Unregister for keyboard events");
[[NSNotificationCenter defaultCenter]
removeObserver:self];
}
-(void) keyboardDidShow: (NSNotification *)notif {
NSLog(#"Keyboard is visible");
// If keyboard is visible, return
if (keyboardVisible) {
NSLog(#"Keyboard is already visible. Ignore notification.");
return;
}
// Get the size of the keyboard.
NSDictionary* info = [notif userInfo];
NSValue* aValue = [info objectForKey:UIKeyboardBoundsUserInfoKey];
CGSize keyboardSize = [aValue CGRectValue].size;
// Save the current location so we can restore
// when keyboard is dismissed
offset = scrollview.contentOffset; //in .h declare CGPoint offset and UIScrollView *scrollview.;
// Resize the scroll view to make room for the keyboard
CGRect viewFrame = scrollview.frame;
viewFrame.size.height -= keyboardSize.height;
scrollview.frame = viewFrame;
CGRect textFieldRect = [activeField frame];//in .h UITextField *activeField;
textFieldRect.origin.y += 10;
[scrollview scrollRectToVisible:textFieldRect animated:YES];
// Keyboard is now visible
keyboardVisible = YES;
}
-(void) keyboardDidHide: (NSNotification *)notif {
// Is the keyboard already shown
if (!keyboardVisible) {
NSLog(#"Keyboard is already hidden. Ignore notification.");
return;
}
// Reset the frame scroll view to its original value
scrollview.frame = CGRectMake(0, 0, SCROLLVIEW_CONTENT_WIDTH, SCROLLVIEW_CONTENT_HEIGHT);
// Reset the scrollview to previous location
scrollview.contentOffset = offset;
// Keyboard is no longer visible
keyboardVisible = NO;
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];
return YES;
}
hope would help you :)