Mar 27

If you’re using a UIWebView to display rich text from a string of HTML (as I described yesterday) you can even include HTML links to external URLs.

However when the external web page is displayed it is done using the same scale as your local HTML page. Unless the two pages are about equal in size, the visual transition is less than pleasing.

You can use the scalesPageToFit property of UIWebView to fix this. See line 13:

- (void)loadView
  // Create a custom view hierarchy.
  CGRect appFrame = [[UIScreen mainScreen] applicationFrame];
  UIView *view = [[UIView alloc] initWithFrame:appFrame];
  view.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
  self.view = view;
  [view release];

  CGRect webFrame = [[UIScreen mainScreen] applicationFrame];
  webView = [[UIWebView alloc] initWithFrame:webFrame];
  webView.backgroundColor = [UIColor whiteColor];
  webView.scalesPageToFit = YES;
  [self.view addSubview:webView];

But this causes another problem: your internal HTML page probably looks a lot smaller than you would like. To fix this we’ll use a trick that web app developers use to optimize web sites for the iPhone.

To the HTML code add a meta viewport tag:

<meta name="viewport" content="width=320"/>

The complete code looks like this:

NSString *html = @"<html><head><title>The Meaning of Life</title><meta name=\"viewport\" content=\"width=320\"/></head><body><p>...really is <b>42</b>!</p></body></html>";
[webView loadHTMLString:html baseURL:nil];

written by Nick \\ tags: , ,