iOS keyboard animation conflict - ios

Question

I am currently writing an iOS app and encountered some animation issue. The following is the test code to show my question. It's just a very simple animation that lets the textField to move up when the keyboard shows and move down when the keyboard hides. Interestingly, if it is an English keyboard, it seems that the UIView animation somehow conflicts with the keyboard animation and no animations are performed, but if I switch to the Chinese keyboard, it works fine. I just want to confirm that whether it is a bug from apple....
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
UITextField *textField = [[UITextField alloc] init];
self.textField = textField;
textField.placeholder = #"Click me!!";
textField.frame = CGRectMake(100, 350, 150, 40);
[self.view addSubview:self.textField];
self.textField.delegate = self;
}
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
[UIView animateWithDuration:0.25 animations:^{
CGRect frame = self.textField.frame;
frame.origin.y -= 100;
self.textField.frame = frame;
}];
return YES;
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
[self.textField resignFirstResponder];
[UIView animateWithDuration:0.25 animations:^{
CGRect frame = self.textField.frame;
frame.origin.y += 100;
self.textField.frame = frame;
}];
return YES;
}
UPDATE
It seems that it is a bug from apple... I tried to use iOS 8.3 simulator, and it works super smoothly... In iOS 9.3, if you just try showing and hiding the keyboard, even without moving the textField, the animation will get stuck after several operations...

Answer 1

I'd advise you to move the animation blocks to methods from the notification UIKeyboardWill{Show|Hide}Notification. The delegate methods from your text field are asking about the text field and its behavior – nothing to do with the keyboard itself (and you can even synchronize the duration, curve and delay).
You're returning YES to -textFieldShouldReturn: which is only supposed to check if the text field should process the return key tap.
From my experience with animations, sometimes everything works fine when testing with a real device. I made the suggested changes over here and everything worked fine on an iPhone 5c (iOS 8.1) and iPhone 6s Plus (iOS 10, Beta 1).
Here's a snippet of how it looks like:
- (void)viewDidLoad {
[super viewDidLoad];
[self setupNotifications];
[self initUIElements];
}
- (void)initUIElements {
CGRect frame = CGRectMake(0.f, 20.f, 200.f, 44.f);
self.textField = [[UITextField alloc] initWithFrame:frame];
self.textField.center = CGPointMake(self.view.center.x, 32.f);
self.textField.placeholder = #"Placeholder";
self.textField.delegate = self;
[self.view addSubview:self.textField];
self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 50.f, 50.f)];
self.imageView.center = self.view.center;
self.imageView.backgroundColor = [UIColor magentaColor];
[self.view addSubview:self.imageView];
}
- (void)setupNotifications {
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
}
- (void)keyboardWillHide:(id)sender {
[UIView animateWithDuration:1.f animations:^{
self.textField.center = CGPointMake(self.view.center.x, 32.f);
self.imageView.center = self.view.center;
}];
}
- (void)keyboardWillShow:(id)sender {
[UIView animateWithDuration:1.f animations:^{
self.textField.center = CGPointMake(self.view.center.x, 62.f);
self.imageView.center = CGPointMake(self.view.center.x, (self.view.center.y - 50.f));
}];
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];
return YES;
}

Answer 2

#lin fu
.m
- (void)viewDidLoad {
[super viewDidLoad];
UITextField *textField = [[UITextField alloc] init];
textField.placeholder = #"Click me!!";
textField.delegate = self;
textField.frame = CGRectMake(100, 350, 150, 40);
[self.view addSubview:textField];
}
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
[UIView animateWithDuration:0.25 animations:^{
CGRect frame = textField.frame;
frame.origin.y -= 100;
textField.frame = frame;
}];
return YES;
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];
[UIView animateWithDuration:0.25 animations:^{
CGRect frame = textField.frame;
frame.origin.y += 100;
textField.frame = frame;
}];
return YES;
}
in .h
Try this out. It works for me.

Answer 3

you have another option you can use the third party library call TPAvoidingKeyBoard it will help you out in there