From 7e0561cbb68754d08a803b32b727a8144980a8c9 Mon Sep 17 00:00:00 2001
From: "pengfei.zhou" <pengfeizhou@foxmail.com>
Date: Mon, 25 Nov 2019 15:45:14 +0800
Subject: [PATCH] feat:record and resume previous state of NavigationBar for
 iOS

---
 iOS/Pod/Classes/DoricViewController.m | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/iOS/Pod/Classes/DoricViewController.m b/iOS/Pod/Classes/DoricViewController.m
index 637b5b62..b20bb3c8 100644
--- a/iOS/Pod/Classes/DoricViewController.m
+++ b/iOS/Pod/Classes/DoricViewController.m
@@ -27,6 +27,8 @@
 
 @interface DoricViewController ()
 @property(nonatomic, strong) DoricPanel *doricPanel;
+@property(nonatomic) BOOL navBarHidden;
+@property(nonatomic, strong) UIImage *navBarImage;
 @end
 
 @implementation DoricViewController
@@ -54,6 +56,22 @@ - (instancetype)initWithScheme:(NSString *)scheme alias:(NSString *)alias {
     return self;
 }
 
+- (void)viewWillAppear:(BOOL)animated {
+    [super viewWillAppear:animated];
+    self.navBarHidden = self.navigationController.navigationBarHidden;
+    self.navBarImage = [self.navigationController.navigationBar backgroundImageForBarMetrics:UIBarMetricsDefault];
+}
+
+- (void)viewWillDisappear:(BOOL)animated {
+    [super viewWillDisappear:animated];
+    if (self.navigationController.navigationBarHidden != self.navBarHidden) {
+        [self.navigationController setNavigationBarHidden:self.navBarHidden];
+    }
+    if (self.navBarImage != [self.navigationController.navigationBar backgroundImageForBarMetrics:UIBarMetricsDefault]) {
+        [self.navigationController.navigationBar setBackgroundImage:self.navBarImage forBarMetrics:UIBarMetricsDefault];
+    }
+}
+
 - (void)viewWillLayoutSubviews {
     [super viewWillLayoutSubviews];
     self.doricPanel.view.width = self.view.width;