消除上个PR带入的警告

TZImagePickerController/TZImagePickerController/TZPhotoPreviewController.m

@@ -383,24 +383,19 @@
     }
     if (_tzImagePickerVc.allowCrop) { // 裁剪状态
         _doneButton.enabled = NO;
-        TZImagePickerController *rootVc = self.navigationController;
-        [rootVc showProgressHUD];
+        [_tzImagePickerVc showProgressHUD];
         NSIndexPath *indexPath = [NSIndexPath indexPathForItem:_currentIndex inSection:0];
         TZPhotoPreviewCell *cell = (TZPhotoPreviewCell *)[_collectionView cellForItemAtIndexPath:indexPath];
-        dispatch_async(dispatch_get_global_queue(0, 0), ^{
         UIImage *cropedImage = [TZImageCropManager cropImageView:cell.previewView.imageView toRect:_tzImagePickerVc.cropRect zoomScale:cell.previewView.scrollView.zoomScale containerView:self.view];
         if (_tzImagePickerVc.needCircleCrop) {
             cropedImage = [TZImageCropManager circularClipImage:cropedImage];
         }
-            dispatch_async(dispatch_get_main_queue(), ^{
         _doneButton.enabled = YES;
-                [rootVc hideProgressHUD];
+        [_tzImagePickerVc hideProgressHUD];
         if (self.doneButtonClickBlockCropMode) {
             TZAssetModel *model = _models[_currentIndex];
             self.doneButtonClickBlockCropMode(cropedImage,model.asset);
         }
-            });
-        });
     } else if (self.doneButtonClickBlock) { // 非裁剪状态
         self.doneButtonClickBlock(_isSelectOriginalPhoto);
     }