> On May 11, 2016, at 2:08 PM, Quincey Morris > <quinceymor...@rivergatesoftware.com> wrote: > > On May 11, 2016, at 13:56 , Carl Hoefs <newsli...@autonomy.caltech.edu > <mailto:newsli...@autonomy.caltech.edu>> wrote: >> >> I just tried UIScrollView & -setZoomScale:. No effect. > > I think you’re flailing now. ;) > >> I was hoping there was a way to initially programmatically pinch the view >> down by 10%, so the view's frame isn't reduced as well > > You can’t make a view smaller without making it … smaller. Perhaps you’re not > distinguishing the frame from the bounds? If you apply a 10% reduction to a > 100 x 100 view via a transform, its frame will be 90 x 90, but its bounds > will still be 100 x 100. > >> Would it help if I changed my UIView to be a UIScrollView instead? > > Well, you wouldn’t change your custom UIView to *be* a UIScrollView, but you > might place your custom UIView *inside* a UIScrollView. Setting the zoomScale > on a scroll view changes the transform on the content subviews, not on the > scroll view itself. But wouldn’t you have a zoomable custom view inside a > scroll view anyway? How else do you plan for the user to pan around when it’s > zoomed in? > >> I was hoping there was a way to initially programmatically pinch the view >> down by 10% > > You could, I suppose, scale your content drawing, rather than scaling the > view. In that case, you’d need to put the pinch gesture recognizer on your > view, save the calculated scale factor every time the recognizer changes > state, and redraw your view in drawRect: using the saved scale. But that’s > the functionality that UIScrollView is generally designed to provide for you. > Okay, I'm a little confused... the UIView that's currently there handles pinch zoom in/out fine. Is there a way to programmatically cause a 'pinch zoom out by 10%'? Do you mean that the only way to accomplish this is to have fingers touch the screen? -Carl
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