CODEWITHSUNDEEP
iphoneobjective-cioscocoa-touchcocoa
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Reputation: 5775

UIImagePickerController check if user edited the image

I am using a UIImagePickerController with the property allowsEditing set to YES.

When the user finish picking an image I want to know if the user edited the image he selected or not (e.g. if he scaled the image). This method: 

UIImage *editedImage = [info objectForKey:@"UIImagePickerControllerEditedImage"];

returns always an object even if the user left the picture as it was. Is there any way to check if the user edited the image? For example can i check if the UIImagePickerControllerEditedImage and UIImagePickerControllerOriginalImage are different somehow?

Upvotes: 2

Views: 2316

Answers (5)

James Mundie
James Mundie

Reputation: 21

I know that this is a very old question, with no activity in awhile, but this is what comes up in a google search, and as far as I can tell, the question remains unanswered satisfactorily.

Anyway, the way to tell if the image has been edited or not is this:

In didFinishPickingMediaWithInfo: you can inspect the width of the CropRect and the width of the original image. If CropRect.width == originalImage.width+1, then it has not been edited. The reason this is true is because to edit the image, the user must pinch and zoom, which scales the image and changes the size of the CropRect. Simply moving the image around will not work as it bounces back unless it is scaled.

NSValue *pickerCropRect = info[UIImagePickerControllerCropRect];
CGRect theCropRect = pickerCropRect.CGRectValue;

UIImage *originalImage = info[UIImagePickerControllerOriginalImage];
CGSize originalImageSize = originalImage.size;

if (theCropRect.size.width == originalImageSize.width+1) {
    NSLog(@"Image was NOT edited.");
} else {
    NSLog(@"Image was edited.");
}

As far as I can tell this works in iOS 9 on the 6S and 6+. I see no real reason it shouldn't work elsewhere.

Upvotes: 0

s.calin
s.calin

Reputation: 83

Check this out:

http://developer.apple.com/library/ios/#documentation/uikit/reference/UIImagePickerControllerDelegate_Protocol/UIImagePickerControllerDelegate/UIImagePickerControllerDelegate.html#//apple_ref/doc/uid/TP40007069

This is the docs for the ImagePicker Delegate. As you can see, when the user picks and image this is called:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

info - is a dictionary which contains data about what happened and what has been picked. if allowediting is set to YES then info contains both the original image and the edited one. Check in the link I gave you for the

Editing Information Keys

there are a bunch of constants there which can give you the data you seek!

Start from here to see the whole mechanics: http://developer.apple.com/library/ios/documentation/uikit/reference/UIImagePickerController_Class/UIImagePickerController/UIImagePickerController.html#//apple_ref/occ/instp/UIImagePickerController/allowsEditing

Upvotes: 0

Daniel Hakimi
Daniel Hakimi

Reputation: 1213

Could you not just get and compare the CGSize of the image? 

BOOL sizeChanged = FALSE;

// get current size of image
CGSize originalSize = [image size];

//After the user hase made the action, get the new size
CGSize currentSize = [image size];

// if the dimensions have been editied the condition is true
if ( originalSize.width  != currentSize.width ||
     originalSize.height != currentSize.height
   )
    sizeChanged = TRUE;
else
    sizeChanged = FALSE;

Upvotes: 0

SachinVsSachin
SachinVsSachin

Reputation: 6427

UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

 UIImage *editedimage = [info objectForKey:UIImagePickerControllerEditedImage];
if(editedimage.length>0){
//then got the edited image
}

Upvotes: 0

Paresh Navadiya
Paresh Navadiya

Reputation: 38249

Try this in didFinishPickingMediaWithInfo as i am not sure:

 UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

 UIImage *editedimage = [info objectForKey:UIImagePickerControllerEditedImage];

 if ([UIImagePNGRepresentation(image) isEqualToData:UIImagePNGRepresentation(editedimage)])
  //not edited
 else
  //edited

Upvotes: 8

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