Lior Pollak Lior Pollak - 2 months ago 24x
iOS Question

Symbol not found: kUTTypeImage

I copied some bits of code from apple's documentation- and I got these 2 errors:

Undefined symbols for architecture i386:
"_kUTTypeImage", referenced from:
-[ImagePicker imagePickerController:didFinishPickingMediaWithInfo:] in ImagePicker.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

What am I doing wrong?

The code:

- (IBAction) showSavedMediaBrowser {
[self startMediaBrowserFromViewController: self
usingDelegate: (id)self];

- (BOOL) startMediaBrowserFromViewController: (UIViewController*) controller
usingDelegate: (id <UIImagePickerControllerDelegate,
UINavigationControllerDelegate>) delegate {

if (([UIImagePickerController isSourceTypeAvailable:
UIImagePickerControllerSourceTypeSavedPhotosAlbum] == NO)
|| (delegate == nil)
|| (controller == nil))
return NO;

UIImagePickerController *mediaUI = [[UIImagePickerController alloc] init];
mediaUI.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;

// Displays saved pictures and movies, if both are available, from the
// Camera Roll album.
mediaUI.mediaTypes =
[UIImagePickerController availableMediaTypesForSourceType:

// Hides the controls for moving & scaling pictures, or for
// trimming movies. To instead show the controls, use YES.
mediaUI.allowsEditing = YES;

mediaUI.delegate = delegate;

[controller presentModalViewController: mediaUI animated: YES];
return YES;

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

NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType];
UIImage *originalImage, *editedImage, *imageToUse;

// Handle a still image picked from a photo album
if (CFStringCompare ((__bridge_retained CFStringRef) mediaType, kUTTypeImage, 0)
== kCFCompareEqualTo) {

editedImage = (UIImage *) [info objectForKey:
originalImage = (UIImage *) [info objectForKey:

if (editedImage) {
imageToUse = editedImage;
} else {
imageToUse = originalImage;
// Do something with imageToUse

[[picker parentViewController] dismissModalViewControllerAnimated: YES];

I think the error is where the last method starts, but I'm not sure.

Your post does not have much context to explain the code sections; please explain your scenario more clearly.


Look up the symbol (kUTTypeImage) and locate the image/library it should exist in (MobileCoreServices.framework in this case). Then link your binary with that framework.