Remove UIView after animation without losing other elements - ios

Question

What happens if I toggle between these two for hundreds of times? will be left handers of unused UIViews?
I have several controls on my main UIView and I want to animate (slide-up and slide-down) them as a group of controls, several times, then I decided to add them to an UIView and animate that view. But It seems every time when I add the view to the superView it remains there and if I run [view removeFromSuperView] it also remove all controls I've added to the view. Does it affect performance or can it cause memory leak problem?
(void)slideUp{
repeatViewTop = datePickerButton.frame.origin.y;
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, repeatViewTop)];
[view addSubview:taskTitle];
[view addSubview:taskNote];
[view addSubview:datePickerButton];
[view addSubview:taskSelectedDateViewer];
[self.view addSubview:view];
[UIView animateWithDuration:0.4f
delay:0.1f
options:UIViewAnimationOptionCurveEaseOut
animations:^{
float tempY=view.frame.origin.y;
[view setCenter:CGPointMake(SCREEN_WIDTH/2,tempY)];
[view setAlpha:0.4f];
}
completion:^(BOOL finished){
}];
[self.view insertSubview:view atIndex:0];
}
This will slide down those controls:
- (void)slideDown{
taskTitle.userInteractionEnabled=NO;
//150=view.frame.origin.y after sliding up
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, -114, SCREEN_WIDTH, repeatViewTop)];
[view addSubview:taskTitle];
[view addSubview:taskNote];
[view addSubview:datePickerButton];
[view addSubview:taskSelectedDateViewer];
[self.view addSubview:view];
[UIView animateWithDuration:0.4f
delay:0.1f
options:UIViewAnimationOptionCurveEaseOut
animations:^{
float tempY=view.frame.origin.y *(-1);
[view setCenter:CGPointMake(SCREEN_WIDTH/2,tempY)];
[view setAlpha:1.0f];
}
completion:^(BOOL finished){
}];
[self.view insertSubview:view atIndex:0];
}

Answer 1

You should add the elements in a View only once and keep reference to your view, then animate it and not insert it all the time.
You can create the view at any time, like in the viewDidLoad delegate, like this:
- (void)viewDidLoad {
//Other code here
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, repeatViewTop)];
view.tag = 1999;
[view addSubview:taskTitle];
[view addSubview:taskNote];
[view addSubview:datePickerButton];
[view addSubview:taskSelectedDateViewer];
[self.view addSubview:view];
}
then get a reference to the view in your animations like this:
(void)slideUp{
repeatViewTop = datePickerButton.frame.origin.y;
UIView *view = [self.view viewWithTag:1999];
[UIView animateWithDuration:0.4f
delay:0.1f
options:UIViewAnimationOptionCurveEaseOut
animations:^{
float tempY=view.frame.origin.y;
[view setCenter:CGPointMake(SCREEN_WIDTH/2,tempY)];
[view setAlpha:0.4f];
}
completion:^(BOOL finished){
}];
}