Re: UI to allow user to scale and crop image within a circle
Re: UI to allow user to scale and crop image within a circle
- Subject: Re: UI to allow user to scale and crop image within a circle
- From: Jonathan Hull <email@hidden>
- Date: Tue, 23 Feb 2016 06:29:24 -0800
Have you looked at cocoa controls? I am pretty sure I have seen a few open source projects that do this.
www.cocoacontrols.com <http://www.cocoacontrols.com/>
Thanks,
Jon
> On Feb 23, 2016, at 4:28 AM, Charles Jenkins <email@hidden> wrote:
>
> 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@hidden) 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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