ios - Swift UIScrollView setZoomScale Zooming To Wrong Point -

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i have zoomable uiimageview within uiscrollview. if user double taps on image, uiscrollview zoom in until image fills screen. have zoom scale set in code. part of code works great. here code:

func scrollviewdoubletapped(tapgesture: uitapgesturerecognizer) {      // zoom zoom scale if @ min zoom, else zoom min zoom     if (scrollview.zoomscale == scrollview.minimumzoomscale) {         scrollview.setzoomscale(zoomscale, animated: true)     } else {         scrollview.setzoomscale(scrollview.minimumzoomscale, animated: true)     } }

the problem comes if want zoom specified zoom scale right when view loaded. when attempt zooming, offset incorrect. have println within function scrollviewdidendzooming show me offset, scale, , anchor point.

func scrollviewdidendzooming(scrollview: uiscrollview, withview view: uiview!, atscale scale: cgfloat) {     println("did end zooming scale: \(scale)")     println("offset: \(scrollview.contentoffset)")     println("anchor point: \(scrollview.layer.anchorpoint)") }

when attempt zoom after view loaded, values:

did end zooming scale: 2.27556 offset: (490.0, -0.0) anchor point: (0.5, 0.5)

which has incorrect y offset. when double tap on image zoom in get:

did end zooming scale: 2.27556 offset: (490.0, 653.0) anchor point: (0.5, 0.5)

would able me figure out why i'm having issues zooming when view loaded. call viewdidappear function.


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