I'd forgotten that when I created the web view, I set the autoresizing flags so
the height and width are flexible. Here is the new windowDidFinishLoad:
- (void) webViewDidFinishLoad: (UIWebView *) webView
{
CGRect myFrame = self.frame;
myFrame.size.height = self.preferredHeight;
self.frame = myFrame;
}
With this arrangement, the overlay view and its gradient remain shorter than
the 149 points returned by .preferred height. The web view is now the same
too-short size.
— F
On 14 Jan 2013, at 1:27 PM, Fritz Anderson <fri...@manoverboard.org> wrote:
> For a kiosk-style iPad app, I have a UIViewController (outer controller) that
> responds to a button my allocating an overlay view and making it a subview of
> the outer controller's view. The outer controller sets the overlay's height
> to 100 as a placeholder.
>
> The overlay view contains a UIWebView. After the overlay is initialized, it
> loads an HTML string into the web view. Upon webViewDidFinishLoad:, the
> overlay asks the web view for the height of its contents, and adjusts the
> heights of the web view, and a gradient layer, and itself to the content
> height. See the code at the end of this message.
>
> The preferred height is 149.
>
> I've subclassed CALayer and CAGradientLayer so I can break on setBounds: and
> setFrame:. What I see is that the overlay, its root layer, the web view, and
> the gradient layer get initial heights of 100, but once webViewDidFinishLoad:
> is called, the heights are set to 149. Nothing else. -setTransform: is never
> called on the layers or the view.
>
> I've put colored borders on the root layer, the gradient layer, and the web
> view's root layer, so I can measure them on the screen. What I'm seeing: The
> web view is sized as expected (149). The overlay's root and the gradient
> display at 113 points height. The layers' bounds and frames were not changed
> from a height of 149.
>
> Note, by the way, that at the end of webViewDidFinishLoad:, the web view's
> height is reported as 198. Another headache, though the drawn dimension is
> correct.
>
> This is wrong. Could someone please tell me what my next step should be?
>
> — F
>
>
> - (CGFloat) preferredHeight
> {
> NSString * answer = [self.webView stringByEvaluatingJavaScriptFromString:
>
> @"document.getElementById(\"content\").offsetHeight;"];
> return MAX(answer.floatValue, 100.0);
> // Returns 149
> }
>
> - (void) webViewDidFinishLoad: (UIWebView *) webView // == self.webView
> {
> CGRect webViewFrame = self.webView.frame;
> webViewFrame.size.height = self.preferredHeight;
> self.webView.frame = webViewFrame;
>
> CGRect myFrame = self.frame;
> myFrame.size = webViewFrame.size;
> self.frame = myFrame;
> // setBounds on the root layer: origin=(x=0, y=0) size=(width=984,
> height=149)
>
> self.gradientLayer.frame = self.layer.bounds;
> // setBounds on gradient layer = origin=(x=0, y=0) size=(width=984,
> height=149)
>
> // self.layer.frame = origin=(x=20, y=200) size=(width=984, height=149)
> // self.gradientLayer.frame = origin=(x=0, y=0) size=(width=984,
> height=149)
> // self.webView.frame = (0 0; 984 198)
> // self.frame = origin=(x=20, y=200) size=(width=984, height=149)
> }
>
> // 113, 149
>
>
>
> --
> Fritz Anderson
> Xcode 4 Unleashed: 4.5 supplement for free!
> http://www.informit.com/store/xcode-4-unleashed-9780672333279
>
>
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--
Fritz Anderson
Xcode 4 Unleashed: 4.5 supplement for free!
http://www.informit.com/store/xcode-4-unleashed-9780672333279
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