Still struggling with this… My scrollview containing an imageview seems to work
just fine: I can scale and crop an image with no problem. But I’m having
difficulty getting the desired “crop circle” to hover over the scrollview
properly. When I add it to the main view (not the scrollview) at runtime, I try
using autolayout constraints to pin it to the left, top, right, and bottom of
the scrollview; but it always appears positioned elsewhere, as if it’s not
resizing due to the constraints.
I viewDidLoad(), I create each constraint like this:
let lc = NSLayoutConstraint( overlay, attribute: .Left, relatedBy:
.Equal, toItem: scrollView, attribute: .Left, multiplier: 1, constant: 0 )
And when all four have been created, I call
NSLayoutConstraint.activateConstraints( [ lc, tc, rc, bc ] )
Is this the wrong approach? What’s the right way to display a simple overlay
above the content of a scrollView?
--
Charles
On February 21, 2016 at 20:48:18, Charles Jenkins ([email protected]) wrote:
I’m trying to do something that’s so simple, conceptually, that I’m sure
there’s a demo program for it, if only I could find the right Google search to
locate it.
I want to allow iOS users to select an image (either from the camera roll or by
taking a photo) and display it in a CIRCLE for cropping. Users should be able
to scale and position the image as they like to fit within the circle, then tap
a DONE button to have the image cropped and saved into my app’s image store.
I spent all day today screwing around making a view controller with a
scrollview containing an imageview, and I haven’t figured out how to make the
circle overlay correctly to fit over the scrollview.
Does anybody know of a demo program that’ll show me how to do this?
--
Charles
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