#pragma mark - UIActionSheetDelegate
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
    NSUInteger sourceType = 0;
    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        switch (buttonIndex) {
            case 0:
                sourceType = UIImagePickerControllerSourceTypeCamera;
                break;
            case 1:
                sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
                break;
            case 2:
                return;
        }
    }
    else {
        if (buttonIndex == 1) {
            return;
        }
        else {
            sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
        }
    }


UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.delegate = self;
imagePickerController.allowsEditing = YES;
imagePickerController.sourceType = sourceType;
[self showDetailViewController:imagePickerController sender:nil];


}

pragma mark - UIImagePickerControllerDelegate


(void)imagePickerController:(UIImagePickerController )picker didFinishPickingMediaWithInfo:(NSDictionary )info {
  [picker dismissViewControllerAnimated:YES completion:nil];
  UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
  [self.avatarButton setImage:image forState:UIControlStateNormal];
}
(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
  [self dismissViewControllerAnimated:YES completion:nil];
}