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POUIScrollView -zoomToRect:animated: and CGPoint conversion between views
 

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  1. POUIScrollView -zoomToRect:animated: and CGPoint conversion between views
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    <p>I have got a <code>UIScrollView</code> <strong>A</strong> with a subview <strong>B</strong>, (which itself is a subview of the contentView <strong>D</strong> of <code>A</code> -- so <strong>B</strong> is <strong>NOT</strong> the contentView of the scrollview <code>A</code>) which has a subview, let's call it <strong>C</strong>. </p> <pre><code>+------------------------+ | A | | | | +-------------------+ | | |D (=contentView) | | | | +-----------+ | | | | | B | | | | | | +--+ | | | | | | |C | | | | | | | +--+ | | | | | +-----------+ | | | +-------------------+ | +------------------------+ </code></pre> <p>I would like the scrollView to zoom exactly so that C fills my iPhone's screen, or at least display it to me as large as possible. I cannot wrap my head around how the <code>zoomScale</code> of the scrollview before the zoom (let's assume I zoom in when the scrollview is already zoomed in and has a zoomScale of 2.45). So the first question is, does the zoomScale affect the rect that the UIScrollView zooms into?</p> <p>My second question regards CGPoint conversion. iOS has some built in functions to convert CGPoints/CGRects between views, but I simply can't produce anything productive from the given references.</p> <p>Here is what I intended to do: </p> <p>1) Convert <strong>C</strong>'s origin to <strong>A</strong>'s coordinate system:</p> <pre><code>CGPoint originConvertedToAsCoordinateSystem = [self convertPoint:C.frame.origin toView:A]; </code></pre> <p>2) Zoom to the rect with the given origin of <strong>C</strong>:</p> <pre><code>//shortened for the purpose of readability CGPoint p = originConvertedToAsCoordinateSystem; CGRect zoomRect = CGRectMake(p.x,p.y,C.frame.size.width,C.frame.size.height); [A zoomToRect:zoomRect animated:YES]; </code></pre> <p>I have neglected the value of <strong>A</strong>'s<code>zoomScale</code> in my given example as I do not really know whether to multiply or divide the value. </p>
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    1. CONot sure I understand your questions. Just a note: the rect to zoom must be in the content view's coordinate space (I assume it is subview B) so you do not need to to convert C.frame, just use it as is.
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    2. CO@yurish I just want the scroll view `A` to zoom to the origin of view `C`. I cannot 'just use `C`'s frame' because its frame is in `B`'s coordinate system. So I would have to convert `C`'s origin to the coordinate space of `A`. The
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    3. COSorry, but "zoom to origin" (which is point, not a rectangle) just does not make much sense to me. Also have you read zoomToRect method description? It explicitly states that "The rectangle should be in the coordinate space of the view returned by viewForZoomingInScrollView:". The view in your case must be B, not the scroll view itself as you are trying to do. Anyway see the answer.
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