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 <UIKit/UIKit.h>//step1. 导入QuickLook库和头文件#import <QuickLook/QuickLook.h>//step2. 继承协议@interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate,QLPreviewControllerDataSource,QLPreviewControllerDelegate,UIDocumentInteractionControllerDelegate>{    //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