.net barcode sdk free The Web View in Objective-C

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The Web View
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This chapter wraps up its discussion of controls by discussing the web view The UIWebView is the class you use to add a web browser to your application It s based upon the same code foundation as Safari, and so you can use CSS and JavaScript Using the web view can be easy, or more difficult, depending upon how much you wish your application to interact with the browser In this chapter you keep it simple
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UIWebView
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The UIWebView is responsible for the web view s display It is an easy means of embedding web content in your application The loadRequest: method is how you load web content You can check on the control s progress loading a resource using the loading property You might
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also wish moving forward or backward through the user s browsing history; you do this using the goBack and goForward methods And of course, you can first check to see if the control can move backwards or forwards by checking the canGoBack or canGoForward properties If you own an iPhone, then I am certain you have noticed that you can tap telephone numbers in the Safari browser and it automatically dials the number The UIWebView automatically implements this behavior unless you specifically inform it not to by setting the detectsPhoneNumbers property to NO Another method that is subtle, yet powerful is the stringByEvaluatingJavaScriptFromString: method
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- (NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)script
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Why is this method so powerful The stringByEvaluatingJavaScriptFromString: method allows evaluating any JavaScript string You can access a page s Document Object Model (DOM) through JavaScript, and so you can manipulate an HTML page s content The HTML DOM is a W3C standard for manipulating HTML documents HTML DOM is outside this book s scope, but for more information refer to the W3C School s HTML DOM Tutorial, available online at wwww3schoolscom If you wish programming using the web browser you would be well served by learning the HTML DOM The following Try This example, illustrates using the stringByEvaluatingJavaScriptFromString: method to print a page s HTML content You navigate to a specific page by using the UIWebView s loadRequest method
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- (void) loadRequest: (NSURLRequest *) request
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The loadRequest method takes a URL request as a parameter and navigates to the resource represented by the underlying URL A NSURL class wraps the NSURLRequest s underlying URL Both the NSURLRequest and NSURL are part of the Foundation framework You use both in the next Try This example application
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UIWebViewDelegate
UIWebViews can also have a delegate You create a delegate for a UIWebView by creating a class that adopts the UIWebViewDelegate protocol and then assigning the UIWebView s delegate property to the custom class The UIWebViewDelegate handles key events when loading a web page When an event occurs, the web view calls the appropriate delegate method For instance, when a web view is about to load a page it calls the webView:should StartLoadWithRequest:navigationType: method
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURL Request *) request navigationType:(UIWebViewNavigationType)navigationType
When a web view starts loading a page it calls the webViewDidStartLoad: method
- (void)webViewDidStartLoad:(UIWebView *)webView
12:
Controls Part One
When a web view finishes loading a page it calls the webViewDidFinishLoad: method, unless an error occurs, and instead it calls the webView:didFailLoadWithError: method
- (void)webViewDidFinishLoad:(UIWebView *)webView - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
Try This
Creating a Simple Web Browser
1 Create a new View-based Application named MyWeb 2 Create a new class called MyWebViewDelegate and have it adopt the UIWebViewDelegate
protocol (Listings 12-10 and 12-11)
3 Open MyWebViewControllerxib in Interface Builder 4 Add a Web View from the Library to the canvas Also add a text field and a button
(Figure 12-29)
Figure 12-29
A simple web browser in Interface Builder
(continued)
iPhone SDK Programming: A Beginner s Guide
5 Change the text field s keyboard type to URL 6 Save and exit Interface Builder 7 Open MyWebViewController and add IBOutlets for the text field and the web view
(Listings 12-12 and 12-13) Add and IBAction called changeLocation Add the MyWebViewDelegate as a property and implement the viewDidLoad method
8 Save and return to Interface Builder 9 Connect the button s Touch Up Inside action to the changeLocation action Connect the
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