UIImagePickerController自定义叠加预览拍摄照片

Question

我正在使用UIImagePickerController创建自定义相机控件。我遇到的问题是：

当用户拍照时，我想展示他们拍摄的照片的预览。我已经设法通过在相机取景器上显示UIImageView来做到这一点。唯一的问题是在显示图像视图之前存在可见的延迟。有任何想法吗？我的代码如下所示

- (void)viewDidLoad
{
   [super viewDidLoad];
   picker = [[UIImagePickerController alloc] init];
   [picker setSourceType:UIImagePickerControllerSourceTypeCamera];
   overlayViewController = [[CameraOverlayViewController alloc] initWithNibName:nil bundle:nil];
   [picker setCameraOverlayView:overlayViewController.view];
   [picker setShowsCameraControls:NO];
   [picker setDelegate:self];
   [self.view addSubview:picker.view];
}

-(void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *img = [info objectForKey:UIImagePickerControllerOriginalImage];
    [overlayViewController.imgView setImage:img];
    [overlayViewController.imgView setHidden:NO];
    return;
}

Answer 1

UIImagePickerController是UINavigationController的子类。您可以创建自定义预览视图控制器（只是包含图像视图和取消和使用按钮的视图控制器）并将其推送到图像选择器控制器上。