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Editorial Team
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Asked: 2026-06-01T22:42:09+00:00

My app uses camera to take a photo. When I open the camera the

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My app uses camera to take a photo.
When I open the camera the second time (after I opened it the first time and closed it),
the app crashes with this message: 

*** -[PLCameraPreviewView isKindOfClass:]: message sent to deallocated instance 0x4193380

what is PLCameraPreviewView?
do you know what is happening, I just use the following code to open the camera: 

self.imagePicker = [[[UIImagePickerController alloc] init] autorelease];
imagePicker.delegate = self;
imagePicker.sourceType =  UIImagePickerControllerSourceTypeCamera;
imagePicker.allowsEditing = NO;
[self presentModalViewController:imagePicker animated:YES];
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1 Answer

  1. Editorial Team

    The reason is that I have a UIView category which has a method:

    +(UIView*)firstResponder;

    when I change the name of this method to

    +(UIView*)theFirstResponder;

    the problem went away.

    I guess we should not name the methods in our category similar to the built-in method names of that class.

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