我有几个问题。 如何将数据(我在Alamofire请求完成后得到的数据)传递给TabBarController的子节点之一?
我遇到的第一个问题是我无法覆盖登录操作中的func prepareForSegue(当点击按钮时),它表示我只能覆盖类成员。但如果我把功能放在IBAction之外,那么我就不会发送我需要的数据。
第二个问题是,当我将覆盖的函数放在IBAction之外时,代码看起来像这样:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
let homeVC = segue.destinationViewController as HomeViewController
homeVC.templateForCell = templates
}
当我运行它时,我收到错误:
无法转换类型' UITabBarController'至 HomeViewController'
(HomeViewController是我的目标视图,我应该从Alamofire传递数据)。
答案 0 :(得分:12)
您不一定需要使用prepareForSegue。只需在TabBarController viewControllers数组中引用所需的ViewController并将其强制转换。
let vc = self.tabBarController.viewControllers![1] as! HomeViewController
vc.templateForCell = templates
如果TabBar中的ViewControllers嵌入在导航控制器中,您可以这样做:
let navController = self.tabBarController.viewControllers![1] as! UINavigationController
let vc = navController.topViewController as! HomeViewController
vc.templateForCell = templates
答案 1 :(得分:2)
对于Xcode 8,Swift 3.x,您可以使用以下内容。这假设您将视图控制器嵌入在导航控制器中。在我的情况下,我试图在从新用户设置视图导航时将名为startWizard
的变量设置为true。
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if (segue.identifier == "segueFromNewUserToDashboard") {
let dashboardController = segue.destination as! MyTabBarController
for viewController in dashboardController.viewControllers! {
let navViewController = (viewController as! MyNavigationController).topViewController!
if (navViewController.isKind(of: DashboardViewController.self) == true) {
(navViewController as! DashboardViewController).startWizard = true
break
}
}
}
}
答案 2 :(得分:0)
您可以从TabController类(父级)中执行以下操作:
var maleVC: MaleOptionsViewController! //First child
var femaleVC: FemaleOptionsViewController! //Second child
override func viewDidLoad() {
super.viewDidLoad()
maleVC = self.viewControllers![0] as? MaleOptionsViewController //Reference to first child
femaleVC = self.viewControllers![1] as? FemaleOptionsViewController //Reference to second child
}
并像这样传递数据:
override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
maleVC.cartTableView?.reloadData() //Where cartTableView is an IBOutlet or even a variable for that matter
femaleVC.cartTableView?.reloadData() //Same thing as the comment ^
}
答案 3 :(得分:-1)
更改标签栏选择索引并将数据发送到该ViewController
tabBarController!.selectedIndex = 2
let navVC = tabBarController!.viewControllers![2] as! UINavigationController
let SV = navVC.topViewController as! SearchViewController
SV.selectedIndex = indexPath.row