iOS开发中WebView的使用-优快云博客

本文链接：https://blog.youkuaiyun.com/cxt528440900/article/details/47457679

iOS开发中WebView的使用

在AppDelegate.m文件中

 
   01. 
   #import "AppDelegate.h" 
  
   02. 
   #import "webTableViewController.h" 
  
   03. 
   @implementation AppDelegate 
  
   04. 
     
   05. 
   - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
  
   06. 
   { 
  
   07. 
   self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
  
   08. 
   // Override point for customization after application launch. 
  
   09. 
   self.window.backgroundColor = [UIColor whiteColor]; 
  
   10. 
   webTableViewController *web = [[webTableViewController alloc]init]; 
  
   11. 
   self.window.rootViewController = web; 
  
   12. 
   [self.window makeKeyAndVisible]; 
  
   13. 
   return YES; 
  
   14. 
   }

新键一个类命名为webTableViewController

webTableViewController.h

 
   01. 
   #import <UIKit/UIKit.h> 
  
   02. 
     
   03. 
   @interface webTableViewController : UIViewController<UIWebViewDelegate> 
  
   04. 
   { 
  
   05. 
   IBOutlet UIWebView *webView; 
  
   06. 
     
   07. 
   UIActivityIndicatorView *activityIndicatorView; 
  
   08. 
   UIView *opaqueView; 
  
   09. 
   } 
  
   10. 
     
   11. 
   @end

webTableViewController.m

 
   01. 
   #import "webTableViewController.h" 
  
   02. 
     
   03. 
   @interface webTableViewController () 
  
   04. 
     
   05. 
   @end 
  
   06. 
     
   07. 
   @implementation webTableViewController 
  
   08. 
   - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
  
   09. 
   { 
  
   10. 
   self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
  
   11. 
   if (self) { 
  
   12. 
   // Custom initialization 
  
   13. 
   } 
  
   14. 
   return self; 
  
   15. 
   } 
  
   16. 
     
   17. 
   - (void)viewDidLoad 
  
   18. 
   { 
  
   19. 
   [super viewDidLoad]; 
  
   20. 
   webView = [[UIWebView alloc]initWithFrame:CGRectMake(0, 44, 320, 440)]; 
  
   21. 
   [webView setUserInteractionEnabled:YES];//是否支持交互 
  
   22. 
   //[webView setDelegate:self]; 
  
   23. 
   webView.delegate=self; 
  
   24. 
   [webView setOpaque:NO];//opaque是不透明的意思 
  
   25. 
   [webView setScalesPageToFit:YES];//自动缩放以适应屏幕 
  
   26. 
   [self.view addSubview:webView]; 
  
   27. 
     
   28. 
   //加载网页的方式 
  
   29. 
   //1.创建并加载远程网页 
  
   30. 
   NSURL *url = [NSURL URLWithString:@"http://www.csdn.com"]; 
  
   31. 
   [webView loadRequest:[NSURLRequest requestWithURL:url]]; 
  
   32. 
   //2.加载本地文件资源 
  
   33. 
   /* NSURL *url = [NSURL fileURLWithPath:filePath]; 
  
   34. 
   NSURLRequest *request = [NSURLRequest requestWithURL:url]; 
  
   35. 
   [webView loadRequest:request];*/ 
  
   36. 
   //3.读入一个HTML，直接写入一个HTML代码 
  
   37. 
   //NSString *htmlPath = [[[NSBundle mainBundle]bundlePath]stringByAppendingString:@"webapp/test.html"]; 
  
   38. 
   //NSString *htmlString = [NSString stringWithContentsOfURL:htmlPath encoding:NSUTF8StringEncoding error:NULL]; 
  
   39. 
   //[webView loadHTMLString:htmlString baseURL:[NSURL fileURLWithPath:htmlPath]]; 
  
   40. 
     
   41. 
   opaqueView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)]; 
  
   42. 
   activityIndicatorView = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)]; 
  
   43. 
   [activityIndicatorView setCenter:opaqueView.center]; 
  
   44. 
   [activityIndicatorView setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhite]; 
  
   45. 
   [opaqueView setBackgroundColor:[UIColor blackColor]]; 
  
   46. 
   [opaqueView setAlpha:0.6]; 
  
   47. 
   [self.view addSubview:opaqueView]; 
  
   48. 
   [opaqueView addSubview:activityIndicatorView]; 
  
   49. 
     
   50. 
     
   51. 
   } 
  
   52. 
     
   53. 
   -(void)webViewDidStartLoad:(UIWebView *)webView{ 
  
   54. 
   [activityIndicatorView startAnimating]; 
  
   55. 
   opaqueView.hidden = NO; 
  
   56. 
   } 
  
   57. 
     
   58. 
   -(void)webViewDidFinishLoad:(UIWebView *)webView{ 
  
   59. 
   [activityIndicatorView startAnimating]; 
  
   60. 
   opaqueView.hidden = YES; 
  
   61. 
   } 
  
   62. 
     
   63. 
   //UIWebView如何判断 HTTP 404 等错误 
  
   64. 
   -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{ 
  
   65. 
   NSURL *url = [NSURL URLWithString:@"http://www.csdn.com"]; 
  
   66. 
   NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response; 
  
   67. 
   if ((([httpResponse statusCode]/100) == 2)) { 
  
   68. 
   // self.earthquakeData = [NSMutableData data]; 
  
   69. 
   [UIApplication sharedApplication].networkActivityIndicatorVisible = YES; 
  
   70. 
     
   71. 
   [ webView loadRequest:[ NSURLRequest requestWithURL: url]]; 
  
   72. 
   webView.delegate = self; 
  
   73. 
   } else { 
  
   74. 
   NSDictionary *userInfo = [NSDictionary dictionaryWithObject: 
  
   75. 
   NSLocalizedString(@"HTTP Error", 
  
   76. 
   @"Error message displayed when receving a connection error.") 
  
   77. 
   forKey:NSLocalizedDescriptionKey]; 
  
   78. 
   NSError *error = [NSError errorWithDomain:@"HTTP" code:[httpResponse statusCode] userInfo:userInfo]; 
  
   79. 
     
   80. 
   if ([error code] == 404) { 
  
   81. 
   NSLog(@"xx"); 
  
   82. 
   webView.hidden = YES; 
  
   83. 
   } 
  
   84. 
     
   85. 
   } 
  
   86. 
   } 
  
   87. 
   - (void)didReceiveMemoryWarning 
  
   88. 
   { 
  
   89. 
   [super didReceiveMemoryWarning]; 
  
   90. 
   // Dispose of any resources that can be recreated. 
  
   91. 
   } 
  
   92. 
     
   93. 
   @end

ios_webView