Synchronizing Animations in keyboardWillShow keyboardWillHide — Hardware Keyboard & Virtual Keyboard Simultaneously

Question

Preamble

So I have an application featuring a chat section, and I\'m synchronizing the animation of the keyboard hiding and showing with the rise and fall of the

Answer 1

Since the animation curve Apple sends you in the keyboard notification does not have a corresponding UIViewAnimationOption bit, you need to drop down to old-school non-block animations and use the curve directly:

NSTimeInterval duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
UIViewAnimationCurve curve = [note.userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue];
[UIView beginAnimations:@"SomeAnimationID" context:NULL];
[UIView setAnimationCurve:curve];
[UIView setAnimationDuration:duration];
// Animation code
[UIView commitAnimations];

Answer 2

keyboardWillShow:

NSDictionary *info = [notification userInfo];
CGRect keyboardFrame = [info[UIKeyboardFrameEndUserInfoKey] CGRectValue];
NSTimeInterval duration = [info[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
UIViewAnimationCurve curve = [info[UIKeyboardAnimationCurveUserInfoKey] integerValue];

[self layoutIfNeeded];
[UIView animateWithDuration:duration delay:0 options:(curve << 20) animations:^{
    [self.keyboardConstraint setConstant:keyboardFrame.size.height];
    [self layoutIfNeeded];
} completion:nil];