Re: Resizing UIView: Content CALayer doesn't resize
Re: Resizing UIView: Content CALayer doesn't resize
- Subject: Re: Resizing UIView: Content CALayer doesn't resize
- From: Fritz Anderson <email@hidden>
- Date: Mon, 14 Jan 2013 14:45:56 -0600
One more thing. Here's the skeleton of the HTML I'm feeding to the web view. It may be a coincidence, but the height the view eventually attains (which is not the .preferredHeight it is set to) is pretty good for the first two paragraphs of the #content <div>.
(id="content" looks collision-prone, but changing the ID to "paragraphs" doesn't help.)
— F
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd";>
<html>
<head>
<title></title>
<style type="text/css"></style>
</head>
<body>
<div id="content">
<p><strong></strong></p>
<p><strong></strong></p>
<p><strong></strong></p>
</div>
</body>
</html>
On 14 Jan 2013, at 2:17 PM, Fritz Anderson <email@hidden> wrote:
> 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 <email@hidden> 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
>
>
--
Fritz Anderson
Xcode 4 Unleashed: 4.5 supplement for free!
http://www.informit.com/store/xcode-4-unleashed-9780672333279
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