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

 iOS elearning------4 UIWebView Three ways to load local dataCategory: IOS2014-06-27 12:56 959 people read comments (0) favorite reports

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

2. -(void) Viewdidload
4. {
6. [Super Viewdidload];
8. [self setupui];
12. nsstring *path = [[NSBundle Mainbundle] pathforresource:@ "about. docx" ofType: nil];
14. Nsurl *url = [Nsurl Fileurlwithpath:path];
16. NSLog (@ "%@", [self Mimetype:url]);
22. //webview loading local files, you can use the way you load data
24. //The first argument is a nsdata, the data corresponding to the local file
26. //The second parameter is MimeType
28. ///The third parameter is the encoding format
30. //relative address, general load local files are not used, you can find related files in the specified baseurl.
34. //load the files in the sandbox as binary data,
36. NSData *data = [NSData Datawithcontentsoffile:path];
40. [self. WebView loaddata:data MIMEType:@ "application/ Vnd.openxmlformats-officedocument.wordprocessingml.document " textencodingname:@" UTF-8 " BaseURL   : nil];
42. }
46. #pragma mark load docx file
48. -(void) Loaddocx
50. {
54. nsstring *path = [[NSBundle Mainbundle] pathforresource:@ "about. docx" ofType: nil];
56. Nsurl *url = [Nsurl Fileurlwithpath:path];
58. NSLog (@ "%@", [self Mimetype:url]);
62. NSData *data = [NSData Datawithcontentsoffile:path];
66. [self. WebView loaddata:data MIMEType:@ "application/ Vnd.openxmlformats-officedocument.wordprocessingml.document " textencodingname:@" UTF-8 " BaseURL  : nil];}
70. #pragma mark loads a PDF file
72. -(void) loadpdf
74. {
76. nsstring *path = [[NSBundle Mainbundle] pathforresource:@ "ios6cookbook.pdf" ofType: nil];
78. Nsurl *url = [Nsurl Fileurlwithpath:path];
80. NSLog (@ "%@", [self Mimetype:url]);
84. NSData *data = [NSData Datawithcontentsoffile:path];
88. [self. WebView loaddata:data MIMEType:@ "Application/pdf" textencodingname:@ "UTF-8"   BaseURL: nil];
90. }
94. #pragma mark loads a local text file
96. -(void) LoadText
98. {
100. nsstring *path = [[NSBundle Mainbundle] pathforresource:@ "about. txt" ofType: nil];
102. Nsurl *url = [Nsurl Fileurlwithpath:path];
104. NSLog (@ "%@", [self Mimetype:url]);
108. NSData *data = [NSData Datawithcontentsoffile:path];
112. [self. WebView loaddata:data MIMEType:@ "Text/plain" textencodingname:@ "UTF-8"   BaseURL: nil];
114. }
120. #pragma mark loads the local HTML file
122. -(void) loadhtml
124. {
126. nsstring *path = [[NSBundle Mainbundle] pathforresource:@ "demo.html" ofType: nil];
128. Nsurl *url = [Nsurl Fileurlwithpath:path];
130. NSLog (@ "%@", [self Mimetype:url]);
134. NSData *data = [NSData Datawithcontentsoffile:path];
138. [self. WebView loaddata:data MIMEType:@ "text/html" textencodingname:@ "UTF-8"   BaseURL: nil];
140. }
146. #pragma mark gets the mimetype type of the specified URL
148. -(NSString *) MimeType: (nsurl *) URL
150. {
152. //1nsurlrequest
154. nsurlrequest *request = [nsurlrequest requestwithurl:url];
156. //2nsurlconnection
160. //3 in Nsurlresponse, the server tells the browser how to open the file.
164. //Use the Sync method to go to MimeType
166. nsurlresponse *response = nil;
168. [Nsurlconnection sendsynchronousrequest:request returningresponse:&response error: nil];
170. return response.  MIMEType;
172. }

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

[OBJC]View Plaincopy

2. -(void) Viewdidload
4. {
6. [Super Viewdidload];
8. [self setupui];
14. //The first way to load a path
16. NSString *path = [[NSBundle mainbundle] pathforresource:@ "about. docx" Oftype:nil];
18. Nsurl *url = [Nsurl Fileurlwithpath:path];
20. //The second way to load a path
22. Nsurl *url = [[NSBundle Mainbundle] urlforresource:@ "ios6cookbook.pdf" withextension: nil];
26. //uiwebview The second way to load a file.  The first method is in the comments below.
28. nsurlrequest *request = [nsurlrequest requestwithurl:url];
30. [self. WebView Loadrequest:request];
34. //nslog (@ "%@", [self mimetype:url]);
36. //webview loading local files, you can use the way you load data
38. //The first argument is a nsdata, the data corresponding to the local file
40. //The second parameter is MimeType
42. ///The third parameter is the encoding format
44. //relative address, general load local files are not used, you can find related files in the specified baseurl.
48. //load the files in the sandbox as binary data,
50. NSData *data = [NSData Datawithcontentsoffile:path];
52. //
54. [Self.webview loaddata:data mimetype:@ "application/vnd.openxmlformats-officedocument.wordprocessingml.document "textencodingname:@" UTF-8 "Baseurl:nil";
56. }

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)

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