iphone - 使用自定义相机覆盖 iPhone SDK 3.1+ 时，图像移动和调整大小不起作用

Question

我曾经使用老式方法在相机屏幕上添加覆盖层，效果很好。然而，自从 3.1 出来之后，Apple 就坚持让我使用 API 添加覆盖层。我很快就让叠加层开始工作，但似乎如果我使用自定义叠加层，则移动和调整大小屏幕没有响应，我只能使用或重新拍摄，实际上无法调整大小和移动。我正在使用的代码如下。我尝试了几种变体，但真正启用移动和调整大小的唯一方法是删除添加自定义覆盖 View 的行。

有什么想法吗？

UIImage *image = [UIImage imageNamed:@"camera-template-long.png"];
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)] ;
imgView.image = image;

UIView *overlayView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
overlayView.opaque = NO;
[overlayView addSubview:imgView];

UIImagePickerController* picker = [[UIImagePickerController alloc] init];
picker.sourceType = UIImagePickerControllerSourceTypeCamera;        
picker.showsCameraControls = YES;
picker.cameraOverlayView = overlayView;
picker.delegate = self;
picker.allowsEditing = YES;

[self presentModalViewController:picker animated:YES];

Answer 1

将 allowsEditing/showsCameraControls 属性设置为 NO，将原始 View 准备为 cameraOverlayView，并使用 takePicture方法。

然后，imagePickerController:didFinishPickingMediaWithInfo:将被直接调用。

<小时/>

请尝试以下代码:

- (void)foo {
  UIImagePickerController *controller = [[[UIImagePickerController alloc] init] autorelease]; 
  controller.sourceType = UIImagePickerControllerSourceTypeCamera; 
  controller.cameraOverlayView = self.cameraOverlay; 
  [self performSelector:@selector(moveOverlayViewToSublayer:) withObject:controller afterDelay:0.1f]; 
  controller.delegate = self; 
  [self presentModalViewController:controller animated:YES]; 
}
- (void) moveOverlayViewToSublayer:(UIImagePickerController*)controller { 
  CALayer *aLayer = self.cameraOverlay.layer.superlayer; 
  controller.cameraOverlayView = nil; 
  [aLayer addSublayer:self.cameraOverlay.layer]; 
}

希望它能运作良好。