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iPhone: falla al guardar una imagen de la cámara en el álbum de iPhone

Question

Estoy tomando una foto con mi aplicación, se llama al método de delegado, la imagen se guarda en la biblioteca, pero tengo un error de bloqueo en el registro:

*** Terminating app due to uncaught exception ''NSInvalidArgumentException'', reason: ''+[NSInvocation invocationWithMethodSignature:]: method signature argument cannot be nil''
*** Call stack at first throw:
(
    0   CoreFoundation                      0x33ac0987 __exceptionPreprocess + 114
    1   libobjc.A.dylib                     0x3347b49d objc_exception_throw + 24
    2   CoreFoundation                      0x33a6b05d +[NSInvocation invocationWithMethodSignature:] + 340
    3   PhotoLibrary                        0x3038da11 __-[PLAssetsSaver _createWriteImageCompletionBlockWithImage:target:selector:contextInfo:]_block_invoke_1 + 96
    4   PhotoLibrary                        0x3038d7cd __-[PLAssetsSaver _saveImage:imageData:properties:completionBlock:]_block_invoke_2 + 56
    5   PhotoLibrary                        0x3038de87 __-[PLAssetsSaver queueJobData:requestEnqueuedBlock:completionBlock:imagePort:previewImagePort:]_block_invoke_2 + 122
    6   libSystem.B.dylib                   0x33c32680 _dispatch_call_block_and_release + 20
    7   libSystem.B.dylib                   0x33c32e38 _dispatch_main_queue_callback_4CF + 220
    8   CoreFoundation                      0x33a482ab __CFRunLoopRun + 1334
    9   CoreFoundation                      0x33a47c87 CFRunLoopRunSpecific + 230
    10  CoreFoundation                      0x33a47b8f CFRunLoopRunInMode + 58
    11  GraphicsServices                    0x33b0e4ab GSEventRunModal + 114
    12  GraphicsServices                    0x33b0e557 GSEventRun + 62
    13  UIKit                               0x32099329 -[UIApplication _run] + 412
    14  UIKit                               0x32096e93 UIApplicationMain + 670
    15  MySoPrettyApp                       0x00002737 main + 82
    16  MySoPrettyApp                       0x000026e0 start + 40
)
terminate called after throwing an instance of ''NSException''

Mi código es el siguiente:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    UIImage *pickedImage = [[info objectForKey:UIImagePickerControllerOriginalImage] retain];
    UIImageWriteToSavedPhotosAlbum (pickedImage, self, @selector(photoSaved:::), nil);
}

-(void)photoSaved:(UIImage*)image didFinishSavingWithError:(NSError*)error contextInfo:(void*)contextInfo {
    if(!error){
        NSLog(@"Photo saved to library!");
    } else{
        NSLog(@"Saving failed :(");
    }
}

pickedImage no es nada.
El método de foto guardada se declara en .h
También probé con @selector (photoSaved :) y @selector (photoSaved).

Cuál es el problema ?

Answer 1

La forma correcta de obtener el selector es la siguiente, ya que los nombres de los argumentos también forman parte del nombre del método:

 @selector(photoSaved:didFinishSavingWithError:contextInfo:)

Answer 2

Pruébalo así:

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo 
{
    if(!error){
        NSLog(@"Photo saved to library!");
    } 
    else{
    NSLog(@"Saving failed :(");
    }
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{
    UIImage *pickedImage = [[info objectForKey:UIImagePickerControllerOriginalImage] retain];
    UIImageWriteToSavedPhotosAlbum(pickedImage, self, @selector(image:didFinishSavingWithError:contextInfo:), nil );
}