Getting subViews' frames in Storyboard

Question

I just want (for now) to get the dimensions of a subview on the view controller\'s instantiation.

[This is a reduction to as simple a case I can find of a previous

Answer 1

There is a Related issue that I am compelled to address, which hopefully will save someone else a day of debugging:

I am finding out that in Storyboard:

1. segue-push does not cause subViews to be laid out at -viewDidLayoutSubviews (they are instead laid out at some other time just before -viewDidAppear).
   Whereas...
2. segue-modal and [navController.storyboard presentViewController:] does cause subViews to be laid out at -viewDidLayoutSubviews.

The solution is to put [self.mySubView layoutSubviews] within the viewController's -viewDidLayoutSubviews method in order to manually load the subViews within mySubView.

My case was that I had a custom gradient button that was not properly initializing it's visual appearance.
The button was contained within a scrollView that contained a CustomView which contained the custom gradient button.
So, basically... a button within a view within a scrollView.

The app starts out with a UINavigationController having some other ViewController1 loaded.
ViewController1 contains a button which, when pressed, launches a storyboard segue-push to ViewController2.
(this was arranged in storyboard by control-dragging from the button in ViewController1 to ViewController2).

ViewController2 contains the scrollview/customView/customButton.
In ViewController2's -viewDidLayoutSubviews, I initialize the customButton which is a custom Gradient Button having it's own .h/.m files.
GradientButton.m has an initLayers method which configures it graphically and requires the bounds/frame property of the button to be initialized.
However...
in ViewController2's -viewDidLayoutSubviews, self.customButton had a frame of 0,0,0,0.

A few notes:

1. Yes, I am calling [super viewDidLayoutSubviews] at the beginning of -viewDidLayoutSubviews.
2. The only view that has been laid out at -viewDidLayoutSubviews is self.view (ViewController2's initial view, as connected in Storyboard's connections panel. in my case - self.view is a scrollView).

To resolve:

1. in ViewController2, I created an outlet self.bottomView for the view that contained self.customButton.
2. in ViewController2's -viewDidLayoutSubviews, I call [self.bottomView layoutSubviews]
   • This will then cause customButton's frame/bounds to be properly set.
3. Next, I call [self.customButton initLayers] which now properly initializes my custom gradient button.

A few notes about ViewController2's -viewDidLayoutSubviews: calling [self.view layoutSubviews] causes bottomView's frame to be initialized, but NOT customButton's frame.
In terms of a view hierarchy, -layoutSubviews applies only to the subViews of self.view and not to any subViews of those subViews.
This only appears to be the case with storyboard segue-push.

The storyboard segue-modal and the programmatic [navController presentViewController] both seem to correctly initialize all levels of the view hierarchy (all "subViews of subViews") by the time -viewDidLayoutSubviews is called.