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 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 nula.
método El photoSaved se declara en el .h
También probé con @selector (photoSaved :) y @selector (photoSaved).

¿Cuál es el problema?

Answer 1

La forma correcta para conseguir el selector es el siguiente, ya que los nombres de argumentos son también una parte del nombre del método:

@selector(photoSaved:didFinishSavingWithError:contextInfo:) 

Answer 2

Trate de esta manera:

- (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); 
}