objective-c - 当点击覆盖中的按钮时，带有相机 OverlayView 的 UIImagePickerController 聚焦

Question

我是 Objective C 的新手，这是我在这里发布的第一个问题，所以这可能是世界上最容易回答的问题，但我想不出这个问题。

我正在尝试创建一个使用相机的 iOS 应用程序。我使用 UIImagePickerController 类来显示相机和拍照，但我使用 cameraOverlayView 属性创建了一个自定义 UIView，其中包含一堆覆盖相机预览框架的 UIButton 实例。我正在使用 a 方法通过以下代码将相机放在屏幕上:

- (BOOL) startCameraControllerFromViewController: (UIImagePickerController*) imagePickerController
                               usingDelegate: (id <UIImagePickerControllerDelegate,
                                               UINavigationControllerDelegate>) imagePickerControllerDelegate {

if (([UIImagePickerController isSourceTypeAvailable:
      UIImagePickerControllerSourceTypeCamera] == NO)
    || (imagePickerController == nil)
    || (imagePickerControllerDelegate == nil))
    return NO;

imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;

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

imagePickerController.allowsEditing = NO;
imagePickerController.showsCameraControls = NO;
imagePickerController.wantsFullScreenLayout = YES;

imagePickerController.delegate = imagePickerControllerDelegate;

self.cameraOverlayViewController = [[CameraOverlayViewController alloc] initWithImagePickerControllerDelegate:imagePickerController nibName:@"CameraOverlayView" bundle:nil];
self.cameraOverlayViewController.view.frame = CGRectMake(0, 0, imagePickerController.view.frame.size.width, imagePickerController.view.frame.size.height);
imagePickerController.cameraOverlayView = self.cameraOverlayViewController.view;

[self presentViewController:imagePickerController animated:self.showCameraAnimation completion:^(void) {
    [self.view bringSubviewToFront:self.cameraOverlayViewController.view];
}];

return YES;

当我按下位于相机预览窗口顶部的按钮时，会触发相应的 IBAction，但底层相机 View 也会被点击并重新聚焦。因此，每次按下按钮时，我都必须在拍照前手动重新对焦相机预览。如您所见，我尝试使用 bringSubViewToFront:，但这似乎不起作用。

当我点击 cameraOverlayView 上的按钮时，如何防止相机对焦？

感谢您的帮助!

Answer 1

将此添加到您的代码中:hitTest:withEvent:

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    UIView *hittedView = [super hitTest:point withEvent:event];
    return hittedView == self.button ? hittedView : nil;
}

我引用了这个: UserInteraction enable for subview only .我已经测试了代码。并且有效!