直接上代碼了：
寫在父類UINavigationController中的
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
if (@available(iOS 11.0, *)) {
//關(guān)鍵適配
UIImage *backButtonImage = [[UIImage imageNamed:@"nav_arrow"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
self.navigationBar.backIndicatorImage = backButtonImage;
self.navigationBar.backIndicatorTransitionMaskImage = backButtonImage;
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(-kScreenWidth, 0)forBarMetrics:UIBarMetricsDefault];//UIOffsetMake(-kScreenWidth, 0)zh只要橫向偏移科平，縱向偏移返回圖標(biāo)也會偏移
}
else{
//設(shè)置返回按鈕的圖片
UIImage *backButtonImage = [[UIImage imageNamed:@"nav_arrow"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 30, 0, 0)];
[[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
//將返回按鈕的文字position設(shè)置不在屏幕上顯示
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(-kScreenWidth, -kScreenHeight)forBarMetrics:UIBarMetricsDefault];
}
if (self.childViewControllers.count > 0) {
//哥么你要想隱藏.那么必須在我push之前給我設(shè)置
viewController.hidesBottomBarWhenPushed = YES;
}
//調(diào)用父類的方法
[super pushViewController:viewController animated:animated];
}
-(void)back
{
[self popViewControllerAnimated:YES];
}
