问如何从我的NSString或NSUrl返回didFinishPickingMediaWithInfo？

EN

@implementation FileBrowser
-(void)selectFile{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.allowsEditing = NO;
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    [self presentViewController:picker animated:YES completion:NULL];
}

#pragma mark - Image Picker Controller delegate methods

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSURL *refURL = [info valueForKey:UIImagePickerControllerReferenceURL];
    NSString *myURL = [refURL absoluteString]; //not in tutorial, I'm trying to grab the url/path of the image here, with an intention of returning it to "callFileBrowser"

    [picker dismissViewControllerAnimated:YES completion:NULL];
}

@end

char* callFileBrowser(){
[fileBrowser selectFile];
//return myURL here;
}