IOS获取摄像和本地中的资源

-(IBAction)btnClick{
   UIActionSheet* actionSheet = [[UIActionSheet alloc]
                                               initWithTitle:@"请选择文件来源"
                                                    delegate:self
                                       cancelButtonTitle:@"取消"
                                destructiveButtonTitle:nil
                                       otherButtonTitles:@"照相机",@"摄像机",@"本地相簿",@"本地视频",nil];
            [actionSheet showInView:self.view];
            [actionSheet release];
}

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。

#pragma mark -
#pragma UIActionSheet Delegate
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{   
    NSLog(@"buttonIndex = [%d]",buttonIndex);
    switch (buttonIndex) {
        case 0://照相机
            {10                 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
                imagePicker.delegate = self;
                imagePicker.allowsEditing = YES;
                imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
                imagePicker.mediaTypes =  [[NSArray alloc] initWithObjects: (NSString *) kUTTypeImage, nil];
                [self presentModalViewController:imagePicker animated:YES];
                [imagePicker release];
            }
            break;
        case 1://摄像机
            {22                 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
                imagePicker.delegate = self;
                imagePicker.allowsEditing = YES;
                imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
                imagePicker.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];
                imagePicker.videoQuality = UIImagePickerControllerQualityTypeLow;
                [self presentModalViewController:imagePicker animated:YES];
                [imagePicker release];
            }
            break;
        case 2://本地相簿
            {35                 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
                imagePicker.delegate = self;
                imagePicker.allowsEditing = YES;
                imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
                imagePicker.mediaTypes =  [[NSArray alloc] initWithObjects: (NSString *) kUTTypeImage, nil];
                [self presentModalViewController:imagePicker animated:YES];
                [imagePicker release];
            }
            break;
        case 3://本地视频
            {47                 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
                imagePicker.delegate = self;
                imagePicker.allowsEditing = YES;
                imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
                imagePicker.mediaTypes =  [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];
                [self presentModalViewController:imagePicker animated:YES];
                [imagePicker release];
            }
            break;
        default:
            break;
    }
}

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：

#pragma mark - 
#pragma UIImagePickerController Delegate
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    if ([[info objectForKey:UIImagePickerControllerMediaType] isEqualToString:(NSString*)kUTTypeImage]) {
        UIImage  *img = [info objectForKey:UIImagePickerControllerEditedImage];
        self.fileData = UIImageJPEGRepresentation(img, 1.0);
    } else if ([[info objectForKey:UIImagePickerControllerMediaType] isEqualToString:(NSString*)kUTTypeMovie]) {
        NSString *videoPath = [[info objectForKey:UIImagePickerControllerMediaURL] path];
        self.fileData = [NSData dataWithContentsOfFile:videoPath]; 
    }
    [picker dismissModalViewControllerAnimated:YES];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker 
{
    [picker dismissModalViewControllerAnimated:YES];
}

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。