how to print barcode in vb.net 2008 Method/Property detectsPhoneNumbers in Objective-C

Generating QR Code in Objective-C Method/Property detectsPhoneNumbers

Method/Property detectsPhoneNumbers
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goBack goForward
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reload scalesPageToFit
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We think the most exciting options are the goBack, goForward, and reload methods, which give you some control over how the UIWebView moves among pages. Similarly, the loadRequest: method can be continually rerun if you want to move a user through multiple pages, treating the UIWebView more like a web slideshow than a browser. In our opinion, the scalesPageToFit property doesn t work correctly at the current time. It always scales the page as if the UIWebView were full screen, and it leaves a less than optimal view if you create a small UIWebView, as you ll do in the next example. As of iPhone OS 4.0, this has yet to be resolved.
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As we wrote in chapter 4, the biggest gotcha in using a UIWebView is that you can t load a URL straight from Interface Builder. Expect to always load NSURLs using the loadRequest: method of NSURLRequest that we ve laid out here to load pages into your web views.
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The web: web views and internet protocols
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14.4.2 Managing the web view delegate
We didn t discuss one other element when we talked about web views in chapters 3 and 4: you can set a delegate to manage a few common responses. You must follow the UIWebViewDelegate protocol, which lists four methods, described in table 14.6.
Table 14.6 Managing UIWebViews with delegate methods Method webView:shouldStartLoadWithRequest:navigationType: webViewDidStartLoad: Summary Called prior to content loading Called after content begins loading Called after content finishes loading Called after content fails to load
webViewDidFinishLoad:
webView:didFailLoadWithError:
Together with the UIWebView methods, these delegate methods give you considerable power. You can use them to load alternative web pages if the preferred ones don t load. Or, continuing the slideshow analogy, you can use them to continuously load new pages when old ones finish. All those possibilities highlight the ways you may be able to use the UIWebView as more than a Safari clone.
14.4.3 Thumbnails: a web view example
As we ve previously stated, UIWebViews are easy to set up, and we re not going to spend a lot of time on a coding sample. Listing 14.2 presents a simple example that creates a set of web page thumbnails, similar to the startup page of the Google Chrome browser. It uses delegates first to get rid of UIWebViews that don t load and later to zoom in on the one the user selects. You should initially create it in Interface Builder by laying out four UIWebViews. Make sure they re set to scale, and set their delegates to be the view controller.
Listing 14.2 A thumbnail web viewer
- (void)viewDidLoad { Sets up [super viewDidLoad]; web views webArray = [[NSArray alloc] initWithObjects:webView1,webView2,webView3,webView4,nil]; NSString *paths = [[NSBundle mainBundle] resourcePath]; NSString *filePath = [paths stringByAppendingPathComponent:@"weblist.txt"]; NSString *webList = [NSString stringWithContentsOfFile:filePath encoding:NSASCIIStringEncoding error:nil]; NSArray *webListArray = [webList componentsSeparatedByString:@"\n"]; for (int i = 0 ; i < [webArray count] ; i++) { [[webArray objectAtIndex:i] loadRequest: [NSURLRequest requestWithURL:
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Using UIWebView
[NSURL URLWithString: [webListArray objectAtIndex:i]]]]; } } Resolves - (void)webView:(UIWebView *)webView errors didFailLoadWithError:(NSError *)thiserror { NSLog(@"Web Thumbs Error: %@",thiserror); if (thiserror.code == -1003) { [webView removeFromSuperview]; } Zooms } active view - (void)webViewDidFinishLoad:(UIWebView *)webView { if (webView.canGoBack == YES) { for (int i = 0 ; i < [webArray count] ; i ++) { if ([webArray objectAtIndex:i] != webView) { [[webArray objectAtIndex:i] removeFromSuperview]; } else { webView.frame = [[UIScreen mainScreen] bounds]; } } } }
To start with, you read a set of (exactly) four URLs from a file and use the NSString method componentsSeparatedByString: to turn them into an NSArray that you use to seed your web views B. After that, it s a question of responding to delegation messages. The webView:didFailLoadWithError: method C shows off some valuable techniques for both debugging and error management. You should use NSLog when you want to do a printf-style reporting of runtime variables. It outputs to /var/log/system .log when you run it in the Simulator. In a UIWebView, two error codes come up with some frequency: -1003 is Can t find host, and -999 is Operation could not be completed. This example ignores -999 (which usually means the user clicked a link before the page finished loading); but in the case of a -1003 failure, you dismiss the web view.
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