iPad 'dismiss keyboard' button doesn't dismiss keyboard

I have a UITextField in a Landscape view, and when I press the开发者_C百科 'dismiss keyboard' button in the lower right of the UIKeyboard view, the keyboard does NOT disappear. Is there a way to programmatically listen for when this key was pressed? Or is there a connection I am not seeing that will make this keyboard go away? This is iOS 4 and XCode 4. Thanks.

I had same problem today and I wondered, wy it works in Apple's KeyboardAccessory Sample Code. So I did reverse engineering. The ViewController was not the mistake I made in my case.

In the implementation of UIApplicationDelegate there is the entry point of application, where root viewcontroller and window will be setup - (void) applicationDidFinishLaunching:(UIApplication *)application. If you forgot to add root viewcontrollers view to window as subview, the dismiss-keyboard-button wouldn't work in any view of your app.

@class ViewController;

@interface KeyboardAccessoryAppDelegate : NSObject <UIApplicationDelegate> {
  UIWindow *window;
  ViewController *viewController;
}

  @property (nonatomic, retain) IBOutlet UIWindow *window;
  @property (nonatomic, retain) IBOutlet ViewController *viewController;

@end

...

- (void)applicationDidFinishLaunching:(UIApplication *)application {    

  [window addSubview:viewController.view];
  [window makeKeyAndVisible];
}

Please don't forget to setup the outlets in the main xib file.

I dont know why this is related to keyboards behavior. But my theory is, that the responder chain is not linked to window, but it needs.

To dismiss the keyboard using the dismiss keyboard button you need to implement the delegate method

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    //Check if your text field is first responder, and if it is, have it resign
}

Alternatively, if you want to dismiss the keyboard by tapping outside of it, use

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    for (UIView* view in self.view.subviews)
    {
        if ([view isKindOfClass:[UITextField class]]) {
            [view resignFirstResponder];
        }

        if ([view isKindOfClass:[UITextView class]]) {
            [view resignFirstResponder];
        }
    }
}

you need to tell the text field that is accepting the keyboard input to no longer be the first responder.

[UITextField resignFirstRepsonder];