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