I am overriding `NSView`’s `layout` method to manually place one of my
subviews.
I can set the frame for this subview, and it works until someone calls
`layoutSubtreeIfNeeded` on the subview (which sometimes happens
automatically during display).
The subview’s `needsLayout` property is `NO` but
`layoutSubtreeIfNeeded` will still go ahead and change the frame.
The problem seems to be that `layoutSubtreeIfNeeded` calls
`resizeWithOldSuperviewSize:` (using the containing view’s size), but
regardless of what’s passed to the view, it’ll set the entire frame
and using values from its constraints (falling back to zero if there
isn’t any).
That is, if the view has hugging and/or intrinsic content size then the
size from the derived constraints will be used, otherwise `NSZeroSize`.
Likewise the origin will be `NSZeroPoint` unless constrains are added to
affect the position.
So how can I ensure the position I set for a subview’s frame in my
`layout` override is not (implicitly) changed later?
Worth mentioning that if I overload `resizeWithOldSuperviewSize:` like
this:
- (void)resizeWithOldSuperviewSize:(NSSize)aSize
{
self.frame = (NSRect){ self.frame.origin, aSize };
}
Then my subview stays put, but the size can be changed. If I simply use
an empty body in the `resizeWithOldSuperviewSize:` override, then I have
not seen any issues with the frame of my custom laid out subview. But of
course that is not an acceptable solution.
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