iOS elearning------4 UIWebView Three ways to load local data

Source: Internet
Author: User
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UIWebView is an iOS built-in browser that can browse Web pages, open documents html/htm PDF Docx txt, and other formats. The Safari browser is done through UIWebView.

The server tells the browser to use that plug-in to read the relevant files by putting the MIME identifiers into the transmitted data.

UIWebView loading various local files (via the LoadData method):

[OBJC]View Plaincopy
  1. -(void) Viewdidload
  2. {
  3. [Super Viewdidload];
  4. [self setupui];
  5. nsstring *path = [[NSBundle Mainbundle] pathforresource:@ "about. docx" ofType: nil];
  6. Nsurl *url = [Nsurl Fileurlwithpath:path];
  7. NSLog (@ "%@", [self Mimetype:url]);
  8. //webview loading local files, you can use the way you load data
  9. //The first argument is a nsdata, the data corresponding to the local file
  10. //The second parameter is MimeType
  11. ///The third parameter is the encoding format
  12. //relative address, general load local files are not used, you can find related files in the specified baseurl.
  13. //load the files in the sandbox as binary data,
  14. NSData *data = [NSData Datawithcontentsoffile:path];
  15. [self. WebView loaddata:data MIMEType:@ "application/ Vnd.openxmlformats-officedocument.wordprocessingml.document " textencodingname:@" UTF-8 " BaseURL:  NIL];
  16. }
  17. #pragma mark load docx file
  18. -(void) Loaddocx
  19. {
  20. nsstring *path = [[NSBundle Mainbundle] pathforresource:@ "about. docx" ofType: nil];
  21. Nsurl *url = [Nsurl Fileurlwithpath:path];
  22. NSLog (@ "%@", [self Mimetype:url]);
  23. NSData *data = [NSData Datawithcontentsoffile:path];
  24. [self. WebView loaddata:data MIMEType:@ "application/ Vnd.openxmlformats-officedocument.wordprocessingml.document " textencodingname:@" UTF-8 " BaseURL:  NIL];}
  25. #pragma mark loads a PDF file
  26. -(void) loadpdf
  27. {
  28. nsstring *path = [[NSBundle Mainbundle] pathforresource:@ "ios6cookbook.pdf" ofType: nil];
  29. Nsurl *url = [Nsurl Fileurlwithpath:path];
  30. NSLog (@ "%@", [self Mimetype:url]);
  31. NSData *data = [NSData Datawithcontentsoffile:path];
  32. [self. WebView loaddata:data MIMEType:@ "Application/pdf" textencodingname:@ "UTF-8"   BaseURL: nil];
  33. }
  34. #pragma mark loads a local text file
  35. -(void) LoadText
  36. {
  37. nsstring *path = [[NSBundle Mainbundle] pathforresource:@ "about. txt" ofType: nil];
  38. Nsurl *url = [Nsurl Fileurlwithpath:path];
  39. NSLog (@ "%@", [self Mimetype:url]);
  40. NSData *data = [NSData Datawithcontentsoffile:path];
  41. [self. WebView loaddata:data MIMEType:@ "Text/plain" textencodingname:@ "UTF-8"   BaseURL: nil];
  42. }
  43. #pragma mark loads the local HTML file
  44. -(void) loadhtml
  45. {
  46. nsstring *path = [[NSBundle Mainbundle] pathforresource:@ "demo.html" ofType: nil];
  47. Nsurl *url = [Nsurl Fileurlwithpath:path];
  48. NSLog (@ "%@", [self Mimetype:url]);
  49. NSData *data = [NSData Datawithcontentsoffile:path];
  50. [self. WebView loaddata:data MIMEType:@ "text/html" textencodingname:@ "UTF-8"   BaseURL: nil];
  51. }
  52. #pragma mark gets the mimetype type of the specified URL
  53. -(NSString *) MimeType: (nsurl *) URL
  54. {
  55. //1nsurlrequest
  56. nsurlrequest *request = [nsurlrequest requestwithurl:url];
  57. //2nsurlconnection
  58. //3 in Nsurlresponse, the server tells the browser how to open the file.
  59. //Use the Sync method to go to MimeType
  60. nsurlresponse *response = nil;
  61. [Nsurlconnection sendsynchronousrequest:request returningresponse:&response error: nil];
  62. return response.  MIMEType;
  63. }



UIWebView loading various local files (via the Loadrequest method):

[OBJC]View Plaincopy
  1. -(void) Viewdidload
  2. {
  3. [Super Viewdidload];
  4. [self setupui];
  5. //The first way to load a path
  6. NSString *path = [[NSBundle mainbundle] pathforresource:@ "about. docx" Oftype:nil];
  7. Nsurl *url = [Nsurl Fileurlwithpath:path];
  8. //The second way to load a path
  9. Nsurl *url = [[NSBundle Mainbundle] urlforresource:@ "ios6cookbook.pdf" withextension: nil];
  10. //uiwebview The second way to load a file.  The first method is in the comments below.
  11. nsurlrequest *request = [nsurlrequest requestwithurl:url];
  12. [self. WebView Loadrequest:request];
  13. //nslog (@ "%@", [self mimetype:url]);
  14. //webview loading local files, you can use the way you load data
  15. //The first argument is a nsdata, the data corresponding to the local file
  16. //The second parameter is MimeType
  17. ///The third parameter is the encoding format
  18. //relative address, general load local files are not used, you can find related files in the specified baseurl.
  19. //load the files in the sandbox as binary data,
  20. NSData *data = [NSData Datawithcontentsoffile:path];
  21. //
  22. [Self.webview loaddata:data mimetype:@ "application/vnd.openxmlformats-officedocument.wordprocessingml.document "textencodingname:@" UTF-8 "Baseurl:nil";
  23. }



UIWebView three ways to load content:

1 loading Local data files

Specify the mimetype of the file

Encoding format using @ "UTF-8"

2 Loading HTML strings (all or part of the HTML file can be loaded)

3 Loading the Nsurlrequest file (the first two steps are the same as Nsurlconnect)

http://blog.csdn.net/huang2009303513/article/details/35210425

iOS elearning------4 UIWebView Three ways to load local data

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