iOS开发- 获取本地视频文件
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
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
- (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