ios 15 导航栏适配

iOS 15 , 导航异常问题
导航进入下一个页面时，导航栏变透明，看到上一个页面标题按钮

#import "GCJNavigationController.h"
#import "GCJBaseViewController.h"
#import "Defined.h"

@interface GCJNavigationController ()
@property (nonatomic, assign) BOOL shouldIgnorePushingViewControllers;
@end

@implementation GCJNavigationController

+ (void)initialize{

  
  if (@available(iOS 15.0, *)) {
          UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
          appearance.backgroundImage = [UIImage imageWithColor:[UIColor whiteColor]]; //图片
          appearance.backgroundColor = [UIColor whiteColor]; //背景色
          appearance.shadowColor = [UIColor whiteColor]; //阴影
          //等等其它属性，可以参考其他文章。
      [UINavigationBar appearance].standardAppearance = appearance;
      [UINavigationBar appearance].scrollEdgeAppearance = appearance;
  }else{
      //因为不是所有界面的barTintColor都一样，所以最好不要直接写
      [[UINavigationBar appearance] setTintColor:UIColor.blackColor];
      [UINavigationBar appearance].barTintColor = [UIColor whiteColor];
      [UINavigationBar appearance].translucent = false;
      [[UINavigationBar appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor colorWithHexString:@"#313331"]}];
  }
      //Xcode13 编译时 ，为了处理透明导航栏的Controller push 非透明导航栏时，导航出现白色背景异常的问题。
      //原来设置导航栏的方式不能省略。
      [[UINavigationBar appearance] setBackgroundImage:[UIImage imageWithColor:[UIColor whiteColor]] forBarMetrics:UIBarMetricsDefault];

}

- (void)viewDidLoad {
  [super viewDidLoad];
}

- (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
}

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
  if (self.viewControllers.count > 0) {
      if (self.viewControllers.count == 1) {
                 viewController.hidesBottomBarWhenPushed = YES;
             }
     
  }else{
      viewController.hidesBottomBarWhenPushed = NO;
  }
  [super pushViewController:viewController animated:animated];
}