I'm trying to get the height of the iOS keyboard. I've gone through and used the method involving subscribing to a notification such as detailed here: https://gist.github.com/philipmcdermott/5183731
- (void)viewDidAppear:(BOOL) animated {
[super viewDidAppear:animated];
// Register notification when the keyboard will be show
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:nil];
// Register notification when the keyboard will be hide
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];
}
- (void)keyboardWillShow:(NSNotification *)notification {
CGRect keyboardBounds;
[[notification.userInfo valueForKey:UIKeyboardFrameBeginUserInfoKey] getValue:&keyboardBounds];
// Do something with keyboard height
}
- (void)keyboardWillHide:(NSNotification *)notification {
CGRect keyboardBounds;
[[notification.userInfo valueForKey:UIKeyboardFrameBeginUserInfoKey] getValue:&keyboardBounds];
// Do something with keyboard height
}
This works fine for when the user actually displays the keyboard.
My problem: I have another view, let's call it micView, that may be presented before the keyboard appears. The user may choose to use the microphone before typing. I would like the micView to be the same height as the keyboard, which is why I need the keyboard's height, but I need it before the keyboard was forced to appear. Thus the UIKeyboardWillShowNotification is not reached before I need to read the value of the height.
My question is: how do I get the height of the keyboard through Notifications, or some other method without ever having the keyboard appear.
I considered explicitly forcing the keyboard to appear in viewDidLoad, so that I can set an instance variable to that value, then hiding it and getting rid of the animations for both things. But is that really the only way to do that?
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