iOS开发- 文件共享(利用iTunes导入文件, 并且显示已有文件)

本文转自http://blog.csdn.net/hitwhylz/article/details/29389939

今天要实现一个功能, 通过iTunes导入文件到应用中, 并且在应用中对这个文件进行编辑。

类似我们平时经常使用的 PDF阅读器那样的东西, 我们可以自己导入我们的电子书。

源码下载:https://github.com/colin1994/iTunesTest.git

下面具体介绍下实现过程。

先看效果图。

图1. 未实现功能前, iTunes截图

图2. 实现功能后, iTunes截图

图3. 实现功能后, 运行截图。

好了, 通过图片, 我们可以看到实现的效果。

功能包括: 允许通过iTunes导入文件。 可以查看沙盒下所有文件。

实现过程:

1。在应用程序的Info.plist文件中添加UIFileSharingEnabled键，并将键值设置为YES。

2。具体代码:

ViewController.h

 //
 //  ViewController.h
 //  iTunesTest
 //
 //  Created by Colin on 14-6-8.
 //  Copyright (c) 2014年 icephone. All rights reserved.
 //

 #import

 //step1. 导入QuickLook库和头文件
 #import

 //step2. 继承协议
 @interface ViewController : UIViewController
 {
     //step3. 声明显示列表
     IBOutlet UITableView *readTable;
 }

 //setp4. 声明变量
 //UIDocumentInteractionController : 一个文件交互控制器,提供应用程序管理与本地系统中的文件的用户交互的支持
 //dirArray : 存储沙盒子里面的所有文件
 @property(nonatomic,retain) NSMutableArray *dirArray;
 @property (nonatomic, strong) UIDocumentInteractionController *docInteractionController;
 @end

ViewController.m

 //
 //  ViewController.m
 //  iTunesTest
 //
 //  Created by Colin on 14-6-8.
 //  Copyright (c) 2014年 icephone. All rights reserved.
 //

 #import "ViewController.h"

 @interface ViewController ()

 @end

 @implementation ViewController
 @synthesize dirArray;
 @synthesize docInteractionController;

 - (void)viewDidLoad
 {
     [super viewDidLoad];


     //step5. 保存一张图片到设备document文件夹中(为了测试方便)
     UIImage *image = [UIImage imageNamed:@"testPic.jpg"];
     NSData *jpgData = UIImageJPEGRepresentation(image, 0.8);
     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
     NSString *documentsPath = [paths objectAtIndex:0]; //Get the docs directory
     NSString *filePath = [documentsPath stringByAppendingPathComponent:@"testPic.jpg"]; //Add the file name
     [jpgData writeToFile:filePath atomically:YES]; //Write the file


     //step5. 保存一份txt文件到设备document文件夹中(为了测试方便)
     char *saves = "Colin_csdn";
     NSData *data = [[NSData alloc] initWithBytes:saves length:10];
     filePath = [documentsPath stringByAppendingPathComponent:@"colin.txt"];
     [data writeToFile:filePath atomically:YES];


     //step6. 获取沙盒里所有文件
     NSFileManager *fileManager = [NSFileManager defaultManager];
     //在这里获取应用程序Documents文件夹里的文件及文件夹列表
     NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
     NSString *documentDir = [documentPaths objectAtIndex:0];
     NSError *error = nil;
     NSArray *fileList = [[NSArray alloc] init];
     //fileList便是包含有该文件夹下所有文件的文件名及文件夹名的数组
     fileList = [fileManager contentsOfDirectoryAtPath:documentDir error:&error];

     self.dirArray = [[NSMutableArray alloc] init];
     for (NSString *file in fileList)
     {
         [self.dirArray addObject:file];
     }

     //step6. 刷新列表, 显示数据
     [readTable reloadData];
 }

 //step7. 利用url路径打开UIDocumentInteractionController
 - (void)setupDocumentControllerWithURL:(NSURL *)url
 {
     if (self.docInteractionController == nil)
     {
         self.docInteractionController = [UIDocumentInteractionController interactionControllerWithURL:url];
         self.docInteractionController.delegate = self;
     }
     else
     {
         self.docInteractionController.URL = url;
     }
 }

 #pragma mark- 列表操作
 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 {
     return 1;
 }


 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
     static NSString *CellName = @"CellName";
     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellName];
     if (cell == nil)
     {
         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellName];
         cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
     }

     NSURL *fileURL= nil;
     NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
     NSString *documentDir = [documentPaths objectAtIndex:0];
     NSString *path = [documentDir stringByAppendingPathComponent:[self.dirArray objectAtIndex:indexPath.row]];
     fileURL = [NSURL fileURLWithPath:path];

     [self setupDocumentControllerWithURL:fileURL];
     cell.textLabel.text = [self.dirArray objectAtIndex:indexPath.row];
     NSInteger iconCount = [self.docInteractionController.icons count];
     if (iconCount > 0)
     {
         cell.imageView.image = [self.docInteractionController.icons objectAtIndex:iconCount - 1];
     }

     return cell;
 }

 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 {
     return [self.dirArray count];
 }


 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
 {
     QLPreviewController *previewController = [[QLPreviewController alloc] init];
     previewController.dataSource = self;
     previewController.delegate = self;

     // start previewing the document at the current section index
     previewController.currentPreviewItemIndex = indexPath.row;
     [[self navigationController] pushViewController:previewController animated:YES];
     //  [self presentViewController:previewController animated:YES completion:nil];
 }



 #pragma mark - UIDocumentInteractionControllerDelegate

 - (NSString *)applicationDocumentsDirectory
 {
     return [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
 }

 - (UIViewController *)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController *)interactionController
 {
     return self;
 }


 #pragma mark - QLPreviewControllerDataSource

 // Returns the number of items that the preview controller should preview
 - (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)previewController
 {
     return 1;
 }

 - (void)previewControllerDidDismiss:(QLPreviewController *)controller
 {
     // if the preview dismissed (done button touched), use this method to post-process previews
 }

 // returns the item that the preview controller should preview
 - (id)previewController:(QLPreviewController *)previewController previewItemAtIndex:(NSInteger)idx
 {
     NSURL *fileURL = nil;
     NSIndexPath *selectedIndexPath = [readTable indexPathForSelectedRow];
     NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
     NSString *documentDir = [documentPaths objectAtIndex:0];
     NSString *path = [documentDir stringByAppendingPathComponent:[self.dirArray objectAtIndex:selectedIndexPath.row]];
     fileURL = [NSURL fileURLWithPath:path];
     return fileURL;
 }


 - (void)didReceiveMemoryWarning
 {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 @end