Animating a UITextview in a UIToolbar issue - ios

Question

I am trying to animate a UITextView to expand the to the width of its containing UIToolbar.
But it animates weird, jumping around.
Can anyone help me make understand why my textbox jumps around?
#define ANIMATION_DURATION 0.5
#define ANIMATION_DELAY 0.03
#interface WebViewController () <UITextFieldDelegate>{
CGRect URLBAR_DEFAULT;
}
-(void)viewDidLoad{
self.txtURLBar = [[UITextField alloc] init];
self.txtURLBar.bounds = CGRectMake(0, 0, 100, 30);
self.txtURLBar.delegate = self;
self.txtURLBar.backgroundColor = [UIColor lightGrayColor];
self.txtURLBar.clearButtonMode = UITextFieldViewModeWhileEditing;
URLBAR_DEFAULT = self.txtURLBar.frame; //KEEP A REFRENCE TO THE ORIGINAL SIZE
}
//START EDITING EXPAND TO FULL WIDTH
- (void)textFieldDidBeginEditing:(UITextField *)textField {
[UIView animateWithDuration:ANIMATION_DURATION delay:ANIMATION_DELAY options:UIViewAnimationOptionCurveLinear animations:^{
[_txtURLBar setFrame:CGRectMake(3, URLBAR_DEFAULT.origin.y, self.view.frame.size.width - 10, URLBAR_DEFAULT.size.height)];
} completion:^(BOOL finished) {
}];
}
//END EDITING SHRINK BACK TO SMALL SIZE
- (void)textFieldDidEndEditing:(UITextField *)textField {
[UIView animateWithDuration:ANIMATION_DURATION delay:ANIMATION_DELAY options:UIViewAnimationOptionCurveEaseOut animations:^{
[_txtURLBar setFrame:CGRectMake(URLBAR_DEFAULT.origin.x, URLBAR_DEFAULT.origin.y, URLBAR_DEFAULT.size.width, URLBAR_DEFAULT.size.height)];
} completion:^(BOOL finished) {
}];
}

Answer 1

The problem may be due to the frame being set in textFieldDidBeginEditing, textFieldDidEndEditing is different. I've done the small POC with same code of yours as below. It's working fine.
#interface ViewController ()
#property (weak, nonatomic) IBOutlet UITextField *resizeableTextField;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//START EDITING EXPAND TO FULL WIDTH
- (void)textFieldDidBeginEditing:(UITextField *)textField {
[UIView animateWithDuration:0.5 delay:0.03 options:UIViewAnimationOptionCurveLinear animations:^{
self.resizeableTextField.frame = CGRectMake(CGRectGetMinX(self.resizeableTextField.frame), CGRectGetMinY(self.resizeableTextField.frame), self.resizeableTextField.frame.size.width + 40, CGRectGetHeight(self.resizeableTextField.frame));
} completion:^(BOOL finished) {
}];
}
//END EDITING SHRINK BACK TO SMALL SIZE
- (void)textFieldDidEndEditing:(UITextField *)textField {
[UIView animateWithDuration:0.5 delay:0.03 options:UIViewAnimationOptionCurveEaseOut animations:^{
self.resizeableTextField.frame = CGRectMake(CGRectGetMinX(self.resizeableTextField.frame), CGRectGetMinY(self.resizeableTextField.frame), self.resizeableTextField.frame.size.width - 40, CGRectGetHeight(self.resizeableTextField.frame));
} completion:^(BOOL finished) {
}];
}
#end