在safari中打开UIWebView链接？ UIWebView委托放置

1 回答

• 1

  参考下面的代码：此代码是Apple示例代码的一部分http://developer.apple.com/library/ios/#samplecode/UICatalog/Introduction/Intro.html

  #import <UIKit/UIKit.h>
  
  @interface WebViewController : UIViewController <UITextFieldDelegate, UIWebViewDelegate>
  {
      UIWebView *myWebView;
  }
  
  @property (nonatomic, retain) UIWebView *myWebView;
  
  @end
  

  ---

  #import "WebViewController.h"
  #import "Constants.h"
  
  @implementation WebViewController
  
  @synthesize myWebView;
  
  - (void)dealloc
  {
      myWebView.delegate = nil;
      [myWebView release];
  
      [super dealloc];
  }
  
  - (void)viewDidLoad
  {
      [super viewDidLoad];
  
      self.title = NSLocalizedString(@"WebTitle", @"");
  
      CGRect webFrame = [[UIScreen mainScreen] applicationFrame];
      webFrame.origin.y += kTopMargin + 5.0;  // leave from the URL input field and its label
      webFrame.size.height -= 40.0;
      self.myWebView = [[[UIWebView alloc] initWithFrame:webFrame] autorelease];
      self.myWebView.backgroundColor = [UIColor whiteColor];
      self.myWebView.scalesPageToFit = YES;
      self.myWebView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
      self.myWebView.delegate = self;
      [self.view addSubview:self.myWebView];
  
      CGRect textFieldFrame = CGRectMake(kLeftMargin, kTweenMargin,
                                         self.view.bounds.size.width - (kLeftMargin * 2.0), kTextFieldHeight);
      UITextField *urlField = [[UITextField alloc] initWithFrame:textFieldFrame];
      urlField.borderStyle = UITextBorderStyleBezel;
      urlField.textColor = [UIColor blackColor];
      urlField.delegate = self;
      urlField.placeholder = @"<enter a URL>";
      urlField.text = @"http://www.apple.com";
      urlField.backgroundColor = [UIColor whiteColor];
      urlField.autoresizingMask = UIViewAutoresizingFlexibleWidth;
      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];
      [urlField release];
  
      [self.myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.apple.com/"]]];
  }
  
  // called after the view controller's view is released and set to nil.
  // For example, a memory warning which causes the view to be purged. Not invoked as a result of -dealloc.
  // So release any properties that are loaded in viewDidLoad or can be recreated lazily.
  //
  - (void)viewDidUnload
  {
      [super viewDidUnload];
  
      // release and set to nil
      self.myWebView = nil;
  }
  
  
  #pragma mark -
  #pragma mark UIViewController delegate methods
  
  - (void)viewWillAppear:(BOOL)animated
  {
      self.myWebView.delegate = self; // setup the delegate as the web view is shown
  }
  
  - (void)viewWillDisappear:(BOOL)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;
  }
  
  - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
  {
      // we support rotation in this view controller
      return YES;
  }
  
  // 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 -
  #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:
                               @"<html><center><font size=+5 color='red'>An error occurred:<br>%@</font></center></html>",
                               error.localizedDescription];
      [self.myWebView loadHTMLString:errorString baseURL:nil];
  }
  
  @end
  

  回复于 2024-04-28T03:46:28+08:00