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POHow to prevent the UIKeyboard from animating away and back after dismissing a UIAlertView
 

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  1. POHow to prevent the UIKeyboard from animating away and back after dismissing a UIAlertView
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    <p>I'm wondering if any iOS devs here have ran into this issue and might be able to propose a solution. It involves the behavior of the UIKeyboard as it relates to a UITextView and UIAlertView.</p> <p>In an app, tapping a UITextView invokes the UIKeyboard. Tapping a button in the UITextView's accessory view invokes a UIAlertView with the UIAlertViewStyleLoginAndPasswordInput style. So far all is good.</p> <p>Here's the badness: dismissing the UIAlertView causes the UIKeyboard to animate away, and then back as the UITextView becomes the first responder again. The desired behavior is to skip the animation. Calling [textView becomeFirstResponder] in the UIAlertViewDelegate methods doesn't seem to do the trick.</p> <p>Here <a href="https://github.com/aerych/responder-test" rel="nofollow">is a sample project</a> that illustrates the behavior, and a relevant code snippet and log is posted below. </p> <p>Thoughts on this?</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; UIBarButtonItem *alertButton = [[UIBarButtonItem alloc] initWithTitle:@"Alert" style:UIBarButtonItemStyleBordered target:self action:@selector(handleAlertButtonTapped:)]; UIBarButtonItem *spacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil]; UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleBordered target:self action:@selector(handleDoneButtonTapped:)]; UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0.0, 0.0, self.view.frame.size.width, 44.0)]; toolbar.barStyle = UIBarStyleBlack; toolbar.items = @[alertButton, spacer, doneButton]; UIView *accessoryView = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, self.view.frame.size.width, 44.0)]; [accessoryView addSubview:toolbar]; textView.inputAccessoryView = toolbar; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleKeyboardWillShow:) name:UIKeyboardWillShowNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleKeyboardDidShow:) name:UIKeyboardDidShowNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleKeyboardWillHide:) name:UIKeyboardWillHideNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleKeyboardDidHide:) name:UIKeyboardDidHideNotification object:nil]; } - (void)handleAlertButtonTapped:(id)sender { NSLog(@"%@", NSStringFromSelector(_cmd)); UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Styled AlertView" message:nil delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; [alertView setAlertViewStyle:UIAlertViewStyleLoginAndPasswordInput]; [alertView show]; } - (void)handleDoneButtonTapped:(id)sender { [textView resignFirstResponder]; } #pragma mark - #pragma mark TextView Delegate Methods - (BOOL)textViewShouldEndEditing:(UITextView *)textView { NSLog(@"%@", NSStringFromSelector(_cmd)); return YES; } - (void)textViewDidEndEditing:(UITextView *)textView { NSLog(@"%@", NSStringFromSelector(_cmd)); } #pragma mark - #pragma mark AlertView Delegate methods - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { NSLog(@"%@", NSStringFromSelector(_cmd)); [textView becomeFirstResponder]; // Not a solution. } - (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex { NSLog(@"%@", NSStringFromSelector(_cmd)); [textView becomeFirstResponder]; // Not a solution. } - (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex { NSLog(@"%@", NSStringFromSelector(_cmd)); [textView becomeFirstResponder]; // Not a solution. } #pragma mark - #pragma mark Keyboard Notification Methods - (void)handleKeyboardWillShow:(NSNotification *)notification { NSLog(@"%@", NSStringFromSelector(_cmd)); [textView becomeFirstResponder]; // Not a solution. } - (void)handleKeyboardDidShow:(NSNotification *)notification { NSLog(@"%@", NSStringFromSelector(_cmd)); [textView becomeFirstResponder]; // Not a solution. } - (void)handleKeyboardWillHide:(NSNotification *)notification { NSLog(@"%@", NSStringFromSelector(_cmd)); [textView becomeFirstResponder]; // Not a solution. } - (void)handleKeyboardDidHide:(NSNotification *)notification { NSLog(@"%@", NSStringFromSelector(_cmd)); [textView becomeFirstResponder]; // Not a solution. } </code></pre> <p>And the result of the logs is something like this:</p> <pre><code>ResponderTest[1228:11303] handleKeyboardWillShow: ResponderTest[1228:11303] handleKeyboardDidShow: ResponderTest[1228:11303] handleAlertButtonTapped: ResponderTest[1228:11303] handleKeyboardWillShow: ResponderTest[1228:11303] handleKeyboardDidShow: ResponderTest[1228:11303] alertView:clickedButtonAtIndex: ResponderTest[1228:11303] alertView:willDismissWithButtonIndex: ResponderTest[1228:11303] handleKeyboardWillHide: ResponderTest[1228:11303] handleKeyboardDidHide: ResponderTest[1228:11303] handleKeyboardWillShow: ResponderTest[1228:11303] handleKeyboardDidShow: ResponderTest[1228:11303] handleKeyboardWillHide: ResponderTest[1228:11303] handleKeyboardDidHide: ResponderTest[1228:11303] handleKeyboardWillShow: ResponderTest[1228:11303] alertView:didDismissWithButtonIndex: ResponderTest[1228:11303] handleKeyboardDidShow: </code></pre>
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