How to make a subview fill its superview

Question

I can't find the answer here anyway, nor do I see a duplicate question.

My code is simple. Given 3 UIView, parent, from and to, remove from from parent and add subview. + add animation but that's just doodads.

Now, the problem is when I do that, the to then get offsetted. It's as if it's pushed down.

I even add To.frame=ParentView.frame; to make sure it works. It doesn't.

What should I have done?

+ (void) AnimateSwitchingWithParent: (UIView *) ParentView From: (UIView *) From To: (UIView* ) To
{
    /*[UIView beginAnimations:@"View Flip" context:nil];
    [UIView setAnimationDuration:1.25];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];


    [UIView setAnimationTransition: UIViewAnimationTransitionFlipFromRight forView:ParentView cache:YES];*/
    [From removeFromSuperview];
    [ParentView addSubview:To];

    To.frame=ParentView.frame; //If I don't do this, the subview is still off by around 20 points
    NSLog(@"To.bounds: %@", NSStringFromCGRect(To.bounds));
    NSLog(@"From.bounds.: %@", NSStringFromCGRect(From.bounds));
    NSLog(@"ParentView.bounds: %@", NSStringFromCGRect(ParentView.bounds));


    //JA_DUMP (To.bounds);
    //JA_DUMP (To.bounds);



    /*[UIView commitAnimations];*/

}

I have figured out the solution. Turns out the frame of To is

To.frames: {{0, 0}, {320, 372}}

However, if I remove To.frame=ParentView.frame the frame is also

{{0, 20}, {320, 460}}

I wonder why? 20 points seem to be the distance of the status bar. Where can we set that frame in InterfaceBuilder?

I set statusbar to none in SimulatedMetric section.

Avigation

Objective-C conventions expect variables to start with a lowercase letter (uppercase is for class/protocol names only). Please stick to them. Your (future?) co-workers will thank you for it. – Comprehend

Answer 1

Seems you misunderstand the frame and bounds, revise your code to To.frame=ParentView.bounds; should be OK.

Related: Why is there an frame rectangle and an bounds rectangle in an UIView?

Political

The point is that the frame is in the coordinates of the superview's superview. bounds is in the coordinates of the view. If you use frame and the superview is offset within it's parent, this won't work correctly. – Pronominal

Answer 2

Fix "20 points" difference from bottom in subView and View in Swift:

To.frame = NSRect(origin: CGPoint(x: ParentView.bounds.origin.x, 
                                  y: ParentView.bounds.origin.y-20), 
                    size: ParentView.bounds.size)

Berneicebernelle