Re: Subview bounds resizing when frame resizes

FROM : Steve Weller
DATE : Mon Mar 03 05:00:30 2008

On Mar 2, 2008, at 4:03 PM, Steve Weller wrote:

>
> I have a custom view with a custom subview. I can't seem t make the 
> bounds of the subview stick. When the view changes the subview's 
> frame, I want the subview's bounds to stay exactly as I set them the 
> first time. The whole point of having this subview is to have a 
> separate coordinate system.
>
> I create the subview like this:
>
>     // Add page into our view
>     pageView = [[BTPPPageView alloc] initWithFrame:[self pageFrame]];
>     [pageView 
> setBounds:NSMakeRect(0,0,pageBoundsSize.width,pageBoundsSize.height)];
>     [self addSubview:pageView];
>
> and I reposition the subview's frame when the view's frame changes:
>
> [pageView setFrame:[self pageFrame]];
>
> The subview bounds are set correctly at the start, but if I make the 
> subview's frame larger, the bounds are scaled larger too. I thought 
> from this in the NSView docs that the subview's bounds would stay 
> fixed:
>
> If your view does not use a custom bounds rectangle, this method 
> also sets your view bounds to match the size of the new frame. You 
> specify a custom bounds rectangle by calling setBounds:, 
> setBoundsOrigin:, setBoundsRotation:, or setBoundsSize:explicitly. 
> Once set, NSView creates an internal transform to convert from frame 
> coordinates to bounds coordinates.
>
> I am using setBounds, so why is it not preventing the scaling? My 
> view has the Autoresizes subviews flag off. The view is created in 
> IB, the subview in code, as above.



Having discovered that all uses of setFrame that I could find that 
handle scaling reset the bounds every time, I changed the code to:

[pageView setFrame:[self pageFrame]];
[pageView 
setBounds:NSMakeRect(0,0,pageBoundsSize.width,pageBoundsSize.height)];

and this achieves what I wanted to do.