iOS開發- 擷取本地視頻檔案，ios開發擷取視頻

iOS開發- 擷取本地視頻檔案，ios開發擷取視頻

下面具體介紹下實現過程。
先看。
圖1. 未實現功能前, iTunes

圖2. 實現功能後, iTunes

圖3. 實現功能後, 運行

好了, 通過圖片, 我們可以看到實現的效果。
功能包括: 允許通過iTunes匯入檔案。 可以查看沙箱下所有檔案。

 實現過程:
1。在應用程式的Info.plist檔案中添加UIFileSharingEnabled鍵，並將索引值設定為YES。

2。具體代碼:
ViewController.h

import <UIKit/UIKit.h>

//step1. 匯入QuickLook庫和標頭檔

import <QuickLook/QuickLook.h>

//step2. 繼承協議
@interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate,QLPreviewControllerDataSource,QLPreviewControllerDelegate,UIDocumentInteractionControllerDelegate>
{
//step3. 聲明顯示列表
IBOutlet UITableView *readTable;
}

//setp4. 聲明變數
//UIDocumentInteractionController : 一個檔案互動控制器,提供應用程式管理與本地系統中的檔案的使用者互動的支援
//dirArray : 儲存沙箱子裡面的所有檔案
@property(nonatomic,retain) NSMutableArray *dirArray;
@property (nonatomic, strong) UIDocumentInteractionController *docInteractionController;
@end

ViewController.m

- (void)viewDidLoad {

   [super viewDidLoad];

//step5. 儲存一張圖片到裝置document檔案夾中(為了測試方便)  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. 儲存一份txt檔案到裝置document檔案夾中(為了測試方便)  char *saves = "Colin_csdn";  NSData *data = [[NSData alloc] initWithBytes:saves length:10];  filePath = [documentsPath stringByAppendingPathComponent:@"colin.txt"];  [data writeToFile:filePath atomically:YES];      //step6. 擷取沙箱裡所有檔案  NSFileManager *fileManager = [NSFileManager defaultManager];  //在這裡擷取應用程式Documents檔案夾裡的檔案及資料夾清單  NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);  NSString *documentDir = [documentPaths objectAtIndex:0];  NSError *error = nil;  NSArray *fileList = [[NSArray alloc] init];  //fileList便是包含有該檔案夾下所有檔案的檔案名稱及檔案夾名的數組  fileList = [fileManager contentsOfDirectoryAtPath:documentDir error:&error];    self.dirArray = [[NSMutableArray alloc] init];  for (NSString *file in fileList)  {      [self.dirArray addObject:file];  }  

//step6. 重新整理列表, 顯示資料
[readTable reloadData];
}

//step7. 利用url路徑開啟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