iOS Managing the Keyboard Moving view up or down when keyboard is present
Example
Note: This only works for the built-in keyboard provided by iOS
SWIFT:
In order for the view of a UIViewController to increase the origin of the frame when it is presented and decrease it when it is hidden, add the following functions to your class:
func keyboardWillShow(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
if self.view.frame.origin.y == 0{
self.view.frame.origin.y -= keyboardSize.height
}
}
}
func keyboardWillHide(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
if self.view.frame.origin.y != 0{
self.view.frame.origin.y += keyboardSize.height
}
}
}
And in the viewDidLoad() method of your class, add the following observers:
NotificationCenter.default.addObserver(self, selector: #selector(Login.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(Login.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
And this will work for any screen size, using the height property of the keyboard.
OBJECTIVE-C:
To do the same thing in Objective-C, this code can be used:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}
- (void)keyboardWillShow:(NSNotification *)notification
{
CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
[UIView animateWithDuration:0.3 animations:^{
CGRect f = self.view.frame;
f.origin.y = -keyboardSize.height;
self.view.frame = f;
}];
}
-(void)keyboardWillHide:(NSNotification *)notification
{
[UIView animateWithDuration:0.3 animations:^{
CGRect f = self.view.frame;
f.origin.y = 0.0f;
self.view.frame = f;
}];
}
