警告：関数 'UIGetScreenImage'の暗黙の宣言

Warning Implicit Declaration Functionuigetscreenimage

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo { UIAlertView *alert // Unable to save the image if (error) alert = [[UIAlertView alloc] initWithTitle:@'Error' message:@'Unable to save image to Photo Album.' delegate:self cancelButtonTitle:@'Ok' otherButtonTitles:nil] else // All is well alert = [[UIAlertView alloc] initWithTitle:@'Success' message:@'Image saved to Photo Album.' delegate:self cancelButtonTitle:@'Ok' otherButtonTitles:nil] [alert show] [alert release] } // Define at top of implementation file CGImageRef UIGetScreenImage(void) ... - (void)buttonPressed:(UIButton *)button { // Capture screen here... CGImageRef screen = UIGetScreenImage() UIImage* image = [UIImage imageWithCGImage:screen] CGImageRelease(screen) // Save the captured image to photo album UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil) }