IOS获取摄像和本地中的资源

上传文件时，我们都的从本地中选择或用相机来拍摄得到文件。

一个上传按钮，单击事件

 1 -(IBAction)btnClick{

 2    UIActionSheet* actionSheet = [[UIActionSheet alloc]

 3                                                initWithTitle:@"请选择文件来源"

 4                                                     delegate:self

 5                                        cancelButtonTitle:@"取消"

 6                                 destructiveButtonTitle:nil

 7                                        otherButtonTitles:@"照相机",@"摄像机",@"本地相簿",@"本地视频",nil];

 8             [actionSheet showInView:self.view];

 9             [actionSheet release];

10 }

点击按钮触发的btnClick事件后将会弹出一个如下的选择筐：

接下来将要为UIActionSheet实现其中的委托了。

 1 #pragma mark -

 2 #pragma UIActionSheet Delegate

 3 - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex

 4 {   

 5     NSLog(@"buttonIndex = [%d]",buttonIndex);

 6     switch (buttonIndex) {

 7         case 0://照相机

 8             {10                 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];

11                 imagePicker.delegate = self;

12                 imagePicker.allowsEditing = YES;

13                 imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

14                 imagePicker.mediaTypes =  [[NSArray alloc] initWithObjects: (NSString *) kUTTypeImage, nil];

15                 [self presentModalViewController:imagePicker animated:YES];

16                 [imagePicker release];

17             }

18             break;

19         case 1://摄像机

20             {22                 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];

23                 imagePicker.delegate = self;

24                 imagePicker.allowsEditing = YES;

25                 imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

26                 imagePicker.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];

27                 imagePicker.videoQuality = UIImagePickerControllerQualityTypeLow;

28                 [self presentModalViewController:imagePicker animated:YES];

29                 [imagePicker release];

30             }

31             break;

32         case 2://本地相簿

33             {35                 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];

36                 imagePicker.delegate = self;

37                 imagePicker.allowsEditing = YES;

38                 imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

39                 imagePicker.mediaTypes =  [[NSArray alloc] initWithObjects: (NSString *) kUTTypeImage, nil];

40                 [self presentModalViewController:imagePicker animated:YES];

41                 [imagePicker release];

42             }

43             break;

44         case 3://本地视频

45             {47                 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];

48                 imagePicker.delegate = self;

49                 imagePicker.allowsEditing = YES;

50                 imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

51                 imagePicker.mediaTypes =  [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];

52                 [self presentModalViewController:imagePicker animated:YES];

53                 [imagePicker release];

54             }

55             break;

56         default:

57             break;

58     }

59 }

实现了UIActionSheet的委托后，要发现，我们使用了UIImagePickerController，这个类将帮我们实现选取文件，打开对应的选取方式。比如当ButtonIndex为0的时候，它将帮我们打开照相机，我们可以使用相机拍摄照片作为上传的选取文件。因此，在这里我们还要实现UIImagePickerController的委托：

 1 #pragma mark - 

 2 #pragma UIImagePickerController Delegate

 3 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

 4 {

 5     if ([[info objectForKey:UIImagePickerControllerMediaType] isEqualToString:(NSString*)kUTTypeImage]) {

 6         UIImage  *img = [info objectForKey:UIImagePickerControllerEditedImage];

 7         self.fileData = UIImageJPEGRepresentation(img, 1.0);

 8     } else if ([[info objectForKey:UIImagePickerControllerMediaType] isEqualToString:(NSString*)kUTTypeMovie]) {

 9         NSString *videoPath = [[info objectForKey:UIImagePickerControllerMediaURL] path];

10         self.fileData = [NSData dataWithContentsOfFile:videoPath]; 

11     }

12     [picker dismissModalViewControllerAnimated:YES];

13 }

14 

15 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker 

16 {

17     [picker dismissModalViewControllerAnimated:YES];

18 }

之后，你选取的文件便保存在了filedata中。就可以随时过来调用了。