Jim Thio Jim Thio - 2 months ago 15
Objective-C Question

How to make a subview fill its superview

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.

cxa cxa
Answer

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?