iOS开发- 文件共享(利用iTunes导入文件, 并且显示已有文件)

谁践踏了优雅 2022-08-27 13:40 159阅读 0赞

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**][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 #

![Center][]

# 图2. 实现功能后, iTunes截图 #

![Center 1][]

# 图3. 实现功能后, 运行截图。 #

![20140608195653515][]

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。 ##

![Center 2][]

## 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

[https_github.com_colin1994_iTunesTest.git]: https://github.com/colin1994/iTunesTest.git
[Center]: /images/20220824/c99bdc79ef874f4b8e46c34aad140920.png
[Center 1]: /images/20220824/142baabf665f4ac2bc86d1275390ed29.png
[20140608195653515]: /images/20220824/0933588c453648bdb035c947c8141da6.png
[Center 2]: /images/20220824/ea3bbba6c62d4831a30850039fbeacf6.png