ViewControllers/WebViewController.m

/*
     File: WebViewController.m 
 Abstract: The view controller for hosting the UIWebView feature of this sample. 
  Version: 2.11 
  
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 */
 
#import "WebViewController.h"
#import "Constants.h"
 
@interface WebViewController () <UITextFieldDelegate, UIWebViewDelegate>
@property (nonatomic, strong) UIWebView *myWebView;
@end
 
 
#pragma mark -
 
@implementation WebViewController
 
- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.title = NSLocalizedString(@"WebTitle", @"");
 
    // create the URL input field
    CGRect textFieldFrame = CGRectMake(kLeftMargin, kTweenMargin,
                                       CGRectGetWidth(self.view.bounds) - (kLeftMargin * 2.0), kTextFieldHeight);
    UITextField *urlField = [[UITextField alloc] initWithFrame:textFieldFrame];
    urlField.borderStyle = UITextBorderStyleBezel;
    urlField.textColor = [UIColor blackColor];
    urlField.delegate = self;
    urlField.placeholder = @"<enter a full URL>";
    urlField.text = @"http://www.apple.com";
    urlField.backgroundColor = [UIColor whiteColor];
    urlField.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleBottomMargin;
    urlField.returnKeyType = UIReturnKeyGo;
    urlField.keyboardType = UIKeyboardTypeURL;  // this makes the keyboard more friendly for typing URLs
    urlField.autocapitalizationType = UITextAutocapitalizationTypeNone; // don't capitalize
    urlField.autocorrectionType = UITextAutocorrectionTypeNo;   // we don't like autocompletion while typing
    urlField.clearButtonMode = UITextFieldViewModeAlways;
    [urlField setAccessibilityLabel:NSLocalizedString(@"URLTextField", @"")];
    [self.view addSubview:urlField];
    
    // create the UIWebView
    CGRect webFrame = self.view.frame;
    webFrame.origin.y += (kTweenMargin * 2.0) + kTextFieldHeight;   // leave room for the URL input field
    webFrame.size.height -= 40.0;
    self.myWebView = [[UIWebView alloc] initWithFrame:webFrame];
    
    self.myWebView.backgroundColor = [UIColor whiteColor];
    self.myWebView.scalesPageToFit = YES;
    self.myWebView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleBottomMargin);
    self.myWebView.delegate = self;
    [self.view addSubview:self.myWebView];
    
    [self.myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.apple.com/"]]];
}
 
 
#pragma mark - UIViewController delegate methods
 
- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
    self.myWebView.delegate = self; // setup the delegate as the web view is shown
}
 
- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    
    [self.myWebView stopLoading];   // in case the web view is still loading its content
    self.myWebView.delegate = nil;  // disconnect the delegate as the webview is hidden
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
 
// this helps dismiss the keyboard when the "Done" button is clicked
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    [self.myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:[textField text]]]];
    
    return YES;
}
 
 
#pragma mark - UIWebViewDelegate
 
- (void)webViewDidStartLoad:(UIWebView *)webView
{
    // starting the load, show the activity indicator in the status bar
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
}
 
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    // finished loading, hide the activity indicator in the status bar
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
 
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
    // load error, hide the activity indicator in the status bar
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
 
    // report the error inside the webview
    NSString* errorString = [NSString stringWithFormat:
                             @"<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\" \"http://www.w3.org/TR/html4/strict.dtd\"><html><head><meta http-equiv='Content-Type' content='text/html;charset=utf-8'><title></title></head><body><div style='width: 100%%; text-align: center; font-size: 36pt; color: red;'>An error occurred:<br>%@</div></body></html>", error.localizedDescription];
    [self.myWebView loadHTMLString:errorString baseURL:nil];
}
 
@end