Merge pull request #1190 from ox-man/master

解决：#1188 导航栏高度会变小

TZImagePickerController/TZImagePickerController/TZPhotoPreviewController.m

@@ -86,11 +86,11 @@
 
 - (void)viewWillDisappear:(BOOL)animated {
     [super viewWillDisappear:animated];
-    [self.navigationController setNavigationBarHidden:NO animated:YES];
     TZImagePickerController *tzImagePickerVc = (TZImagePickerController *)self.navigationController;
     if (tzImagePickerVc.needShowStatusBar) {
         [UIApplication sharedApplication].statusBarHidden = NO;
     }
+    [self.navigationController setNavigationBarHidden:NO animated:YES];
     [TZImageManager manager].shouldFixOrientation = NO;
 }