self.navigationItem 与 self.navigationController.navigationItem 的区别

本文探讨了在iOS开发中如何正确使用self.navigationItem来定制当前view的导航栏,强调了对于self.navigationController.navigationItem的使用是被废弃的方式,并解释了原因。

(1)self.navigationItem  是对当前view导航栏里面的内容进行定制


(2)而对于self.navigationController.navigationItem,苹果则有这样一段说法:

A UINavigationController is a subclass of UIViewController. As such, it has its own independent navigationItem property, which it inherited from UIViewController. You should ignore this property, as it would only be used if you were to embed a navigation controller inside another navigation controller (which nobody in their right mind would ever do).

从上面的这段话,我们可以看出,基本这种使用方式是被废弃的。

private func handleViewWillAppear() { updateTabNamesAfterRelogin() navigationController?.navigationBar.barStyle = .default if isFirst { isFirst = false if appContext.isVmsLogin && !showLocalDeviceOnly && isDeviceListOld { reqSingleSiteInfoCode = appContext.requestSingVmsSiteInfo(bySiteId: self.currentSiteInfo?.siteId ?? 0) } } if needVmsRefresh && appContext.isVmsLogin && !showLocalDeviceOnly { needVmsRefresh = false if isDeviceListOld { reqSingleSiteInfoCode = appContext.requestSingVmsSiteInfo(bySiteId: self.currentSiteInfo?.siteId ?? 0) } if let vc = self.pageController.viewControllers?.first as? OnlineDeviceListViewController { vc.forceRefresh() } } // TODO: 替换文案 localDeviceCountLabel.text = String(format: LocalizedString(key: deviceListNumberOfDevices), localDeviceCount) LocalDeviceViewHeight.constant = CGFloat(0) localDeviceView.isHidden = true if !appContext.isLogin { //未登录 if showLocalDeviceOnly { if localDeviceCount == 0 { self.navigationItem.rightBarButtonItems = [addButtonmItem] } else { self.navigationItem.rightBarButtonItems = [addButtonmItem, negativeButtonItem] } moreSiteButton.isHidden = localDeviceCount == 0 tabBarCollectionView.isHidden = localDeviceCount == 0 } else { //如果未登录则左边按钮不显示 self.navigationItem.leftBarButtonItems = [mineButtonItem] //右边显示所有按钮 self.navigationItem.rightBarButtonItems = [addButtonmItem,negativeButtonItem] tabBarCollectionView.isHidden = true } scrollView.setContentOffset(CGPoint(x: 0, y: 62), animated: false) } else { //如果登录了则左边按钮显示 if showLocalDeviceOnly { moreSiteButton.isHidden = localDeviceCount == 0 tabBarCollectionView.isHidden = localDeviceCount == 0 if localDeviceCount == 0 { self.navigationItem.rightBarButtonItems = [addButtonmItem] } else { self.navigationItem.rightBarButtonItems = [addButtonmItem, negativeButtonItem, searchItem] } removeLeftBarButtonItem() addCustomNavigationLeftBarButtonItem(title: nil, image: TPImageLiteral("common_light_back_nor")) } else { moreSiteButton.isHidden = false tabBarCollectionView.isHidden = false if appContext.isVmsLogin { // 登录状态VMS if isDeviceListOld { removeLeftBarButtonItem() addCustomNavigationLeftBarButtonItem(title: nil, image: TPImageLiteral("common_light_back_nor")) self.navigationItem.rightBarButtonItems = [searchItem, changeDisplayTypeItem] } else { // tab新版VMS不能滚动 tabBarCollectionView.isScrollEnabled = true // addLeftBarButtonItem() if appContext.loginType == .cloud { self.navigationItem.rightBarButtonItems = [addButtonmItem, negativeButtonItem] } else { self.navigationItem.rightBarButtonItems = [] } } } else { // 登录状态个人版 reqVmsOrgListCode = appContext.requestVMSOrganizationList(withUsername: appContext.accountUsername, password: appContext.accountPassword ?? "") // removeLeftBarButtonItem() // if let hasVms = UserDefaults.standard.object(forKey: kHasCloudVMSOrganization) as? Bool, hasVms { // addLeftBarButtonItem() // } self.navigationItem.rightBarButtonItems = [addButtonmItem, negativeButtonItem] } } scrollView.setContentOffset(CGPoint(x: 0, y: 62), animated: false) } if !appContext.isLogin && !showLocalDeviceOnly{ showEmpty() return } else if firstAppear { firstAppear = false restore() } else if shouldRecreate { shouldRecreate = false reload() } //评分引导 self.isNeedEvaluation() // 当tab栏个数等于1的时候禁止左右滑动 for view in pageController.view.subviews { if let subView = view as? UIScrollView { subView.isScrollEnabled = tabNames.count > 1 // 优先处理屏幕边缘滑动手势 if let gestureRecognizers = self.view.gestureRecognizers { for recognizer in gestureRecognizers { if recognizer is UIScreenEdgePanGestureRecognizer { subView.panGestureRecognizer.require(toFail: recognizer) } } } } } registerCallback() if !appContext.isLocalVMSLogin { addTitleView() } else if !isDeviceListOld && !showLocalDeviceOnly { let titleLabel = UILabel() titleLabel.textAlignment = .natural titleLabel.font = .boldProjectFont(ofSize: 22) titleLabel.textColor = .tpbTextPrimary titleLabel.text = appContext.isVmsLogin ? appContext.accountInfo.currentVmsName : LocalizedString(key: accountMyVIGI) let titleItem = UIBarButtonItem.init(customView: titleLabel) navigationItem.leftBarButtonItems = [titleItem] } guard let vc = self.pageController.viewControllers?.first as? OnlineDeviceListViewController else { commonLoad() return } vc.deviceOnlineStatus = currentDeviceOnlineType }
最新发布
11-26
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