Are you an iOS developer looking to dynamically adjust your app's layout based on the height of the keyboard? In Objective-C, you can achieve this by listening to keyboard notifications and calculating the keyboard height. Here's a step-by-step guide on how to get the keyboard height in Objective-C.

Step 1: Register for Keyboard Notifications

First, you need to register your view controller to listen for keyboard notifications. You can do this by adding the following code to your view controller's viewDidLoad method:

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(keyboardWillShow:)

name:UIKeyboardWillShowNotification

object:nil];

Step 2: Handle Keyboard Will Show Notification

Next, implement the keyboardWillShow method in your view controller. This method will be called when the keyboard is about to be displayed. Inside this method, you can access the keyboard's frame and calculate its height:

- (void)keyboardWillShow:(NSNotification *)notification {

NSDictionary *userInfo = [notification userInfo];

NSValue *keyboardFrameValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];

CGRect keyboardFrame = [keyboardFrameValue CGRectValue];

CGFloat keyboardHeight = keyboardFrame.size.height;

// Use the keyboardHeight as needed

}

Step 3: Unregister Keyboard Notifications

Don't forget to unregister your view controller from keyboard notifications when it's no longer needed. You can do this by adding the following code to your view controller's dealloc method:

[[NSNotificationCenter defaultCenter] removeObserver:self];

By following these steps, you can programmatically determine the height of the keyboard in Objective-C and use this information to adjust your app's interface as needed. Whether you need to move UI elements to avoid being obscured by the keyboard or resize a scroll view to accommodate the keyboard, understanding how to get the keyboard height in Objective-C is essential for creating a polished user experience in your iOS app.