iOS Document preview feature tutorial

this article reprinted to http://blog.csdn.net/devday/article/details/6580444Document Iosuinavigationcontrollerextensionmicrosoftcomponents

What is the preview feature of the technical documentation in the iOS 4 SDK? Is the preview feature when you print the file. It is used in quicklook.framework, which supports document formats such as: IWork documents, Microsoft Office, Rich Text format, PDF, images, Text files and comma-s eparated (CSV) files.

Show a demo today showing its usage:

First step: Create a View-based project and join Quicklook.framewrok

Step Two: Modify the controller's header file as follows:

1. #import <QuickLook/QuickLook.h>
3. @interface Testviewcontroller:uitableviewcontroller <QLPreviewControllerDataSource>
4. {
5. Nsarray *arrayofdocuments;
6. }
8. @end

Modify the controller execution file as follows

2. #import "TestViewController.h"
6. @implementation Testviewcontroller
10. #pragma mark-
12. #pragma mark Initialization
16. /*---------------------------------------------------------------------------
18. *
20. *--------------------------------------------------------------------------*/
22. -(ID) init
24. {
26. if (self = [super init])
28. {
30. Arrayofdocuments = [[Nsarray alloc] Initwithobjects:
32. @ "iosdevtips.png", @ "Remodel.xls", @"Core j2me technology.pdf", nil];
36. }
38. return self;
40. }
44. /*---------------------------------------------------------------------------
46. *
48. *--------------------------------------------------------------------------*/
50. -(void) Loadview
52. {
54. [Super Loadview];
58. [Self settitle:@"Files Available for Preview"];
60. }
64. #pragma mark-
66. #pragma Mark Table Management
70. Customize the number of sections in the table view.
72. /*---------------------------------------------------------------------------
74. *
76. *--------------------------------------------------------------------------*/
78. -(Nsinteger) Numberofsectionsintableview: (UITableView *) TableView
80. {
82. return 1;
84. }
88. /*---------------------------------------------------------------------------
90. *
92. *--------------------------------------------------------------------------*/
94. -(Nsinteger) TableView: (UITableView *) TableView numberofrowsinsection: (nsinteger) Section
96. {
98. return [arrayofdocuments Count];
100. }
104. /*---------------------------------------------------------------------------
106. *
108. *--------------------------------------------------------------------------*/
110. -(UITableViewCell *) TableView: (UITableView *) TableView Cellforrowatindexpath: (Nsindexpath *) Indexpath
112. {
114. static NSString *cellidentifier = @"TableRow";
118. UITableViewCell *cell = [TableView dequeuereusablecellwithidentifier:cellidentifier];
120. if (cell = = nil)
122. cell = [[[UITableViewCell alloc] Initwithstyle:uitableviewcellstyledefault Reuseidentifier:cellidentifier] Autorelease];
126. // ???
128. [[Cell Textlabel] settext:[arrayofdocuments ObjectAtIndex:indexPath.row];
130. [Cell Setaccessorytype:uitableviewcellaccessorydisclosureindicator];
134. return cell;
136. }
140. /*---------------------------------------------------------------------------
142. *
144. *--------------------------------------------------------------------------*/
146. -(void) TableView: (UITableView *) TableView Didselectrowatindexpath: (Nsindexpath *) Indexpath
148. {
150. //When user taps a row, create the preview controller
152. Qlpreviewcontroller *previewer = [[[[Qlpreviewcontroller alloc] init] autorelease];
156. //Set data source
158. [Previewer setdatasource:self];
162. //which item to preview
164. [Previewer SetCurrentPreviewItemIndex:indexPath.row];
168. //Push new Viewcontroller, previewing the document
170. [Self Navigationcontroller] pushviewcontroller:previewer Animated:yes];
172. }
176. #pragma mark-
178. #pragma Mark Preview Controller
182. /*---------------------------------------------------------------------------
184. *
186. *--------------------------------------------------------------------------*/
188. -(Nsinteger) Numberofpreviewitemsinpreviewcontroller: (Qlpreviewcontroller *) controller
190. {
192. return [arrayofdocuments Count];
194. }
198. /*---------------------------------------------------------------------------
200. *
202. *--------------------------------------------------------------------------*/
204. -(ID <QLPreviewItem>) Previewcontroller: (Qlpreviewcontroller *) controller previewitematindex: (Nsinteger) Index
206. {
208. //Break the path into it's components (filename and extension)
210. Nsarray *filecomponents = [[arrayofdocuments objectatindex:index] componentsseparatedbystring:@"."];
214. //use of the filename (index 0) and the extension (index 1) to get path
216. NSString *path = [[NSBundle mainbundle] pathforresource:[filecomponents objectatindex:0] OfType:[fileComponents Objectatindex:1]];
220. return [Nsurl Fileurlwithpath:path];
222. }
226. #pragma mark-
228. #pragma Mark Cleanup
232. /*---------------------------------------------------------------------------
234. *
236. *--------------------------------------------------------------------------*/
238. -(void) Dealloc
240. {
242. // free up all the documents
244. [Arrayofdocuments release];
248. [Super Dealloc];
250. }
254. @end

Modify Appdelegate as follows

2. -(void) applicationdidfinishlaunching: (uiapplication *) Application
4. {
6. //Create and initialize the window
8. window = [[UIWindow alloc] initwithframe:[[uiscreen mainscreen] bounds];
12. //Create Test View Controller
14. VC = [[Testviewcontroller alloc] init];
18. //Create navigation controller
20. nav = [[Uinavigationcontroller alloc] INITWITHROOTVIEWCONTROLLER:VC];
24. [Window Addsubview:[nav view];
26. [Window makekeyandvisible];
28. }

The required resource files can be found in the source code.

iOS Document preview feature tutorial