iOS文档预览功能教程

 本文转载至 http://blog.csdn.net/devday/article/details/6580444

 

文档iosuinavigationcontrollerextensionmicrosoftcomponents

ios 4 sdk中支技文档的预览功能，何为预览？就是你打印文件时的预览功能。其用到quicklook.framework，它支持的文档格式有： iWork documents, Microsoft Office, Rich Text Format, PDF, images, text files and comma-separated (csv) files.

今天show一个demo，展示其用法：

第一步：创建一个基于view的工程，并加入quicklook.framewrok

第二步：修改Controller的头文件如下：

#import <QuickLook/QuickLook.h>

@interface TestViewController : UITableViewController <QLPreviewControllerDataSource>
{
  NSArray *arrayOfDocuments;
}

@end

修改 controller执行文件如下

#import "TestViewController.h"

@implementation TestViewController

#pragma mark -
#pragma mark Initialization

/*---------------------------------------------------------------------------
*
*--------------------------------------------------------------------------*/
-(id)init
{
  if (self = [super init])
  {
        arrayOfDocuments = [[NSArray alloc] initWithObjects:
            @"iOSDevTips.png", @"Remodel.xls", @"Core J2ME Technology.pdf", nil];

  }
  return self;
}

/*---------------------------------------------------------------------------
*
*--------------------------------------------------------------------------*/
- (void)loadView
{
    [super loadView];

    [self setTitle:@"Files Available for Preview"];
}

#pragma mark -
#pragma mark Table Management

// Customize the number of sections in the table view.
/*---------------------------------------------------------------------------
*
*--------------------------------------------------------------------------*/
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

/*---------------------------------------------------------------------------
*
*--------------------------------------------------------------------------*/
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [arrayOfDocuments count];
}

/*---------------------------------------------------------------------------
*
*--------------------------------------------------------------------------*/
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  static NSString *CellIdentifier = @"tableRow";

  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
  if (cell == nil)
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

    // ???
    [[cell textLabel] setText:[arrayOfDocuments objectAtIndex:indexPath.row]];
    [cell setAccessoryType:UITableViewCellAccessoryDisclosureIndicator];

    return cell;
}

/*---------------------------------------------------------------------------
*
*--------------------------------------------------------------------------*/
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // When user taps a row, create the preview controller
    QLPreviewController *previewer = [[[QLPreviewController alloc] init] autorelease];

    // Set data source
    [previewer setDataSource:self];

  // Which item to preview
    [previewer setCurrentPreviewItemIndex:indexPath.row];

    // Push new viewcontroller, previewing the document
    [[self navigationController] pushViewController:previewer animated:YES];
}

#pragma mark -
#pragma mark Preview Controller

/*---------------------------------------------------------------------------
*
*--------------------------------------------------------------------------*/
- (NSInteger) numberOfPreviewItemsInPreviewController: (QLPreviewController *) controller
{
    return [arrayOfDocuments count];
}

/*---------------------------------------------------------------------------
*
*--------------------------------------------------------------------------*/
- (id <QLPreviewItem>)previewController: (QLPreviewController *)controller previewItemAtIndex:(NSInteger)index
{
    // Break the path into it's components (filename and extension)
    NSArray *fileComponents = [[arrayOfDocuments objectAtIndex: index] componentsSeparatedByString:@"."];

    // Use the filename (index 0) and the extension (index 1) to get path
  NSString *path = [[NSBundle mainBundle] pathForResource:[fileComponents objectAtIndex:0] ofType:[fileComponents objectAtIndex:1]];

    return [NSURL fileURLWithPath:path];
}

#pragma mark -
#pragma mark Cleanup

/*---------------------------------------------------------------------------
*
*--------------------------------------------------------------------------*/
- (void)dealloc
{
    // Free up all the documents
    [arrayOfDocuments release];

    [super dealloc];
}

@end

修改Appdelegate如下

- (void)applicationDidFinishLaunching:(UIApplication *)application
{
  // Create and initialize the window
  window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

  // Create test view controller
  vc = [[TestViewController alloc] init];

  // Create navigation controller
  nav = [[UINavigationController alloc] initWithRootViewController:vc];

  [window addSubview:[nav view]];
  [window makeKeyAndVisible];
}

所要的资源文件可以源码中找到。