在VC1(集合视图)中,这是我的prepareforsegue代码：
override func prepareForSegue(segue: UIStoryboardSegue,sender: AnyObject?) {
let segue = segue.destinationViewController as TabBarViewController
var selectedIndex = self.collectionView.indexPathForCell(sender as UICollectionViewCell)
segue.selectedIndexPassing = selectedIndex?.row
}
当我到达VC2(这是TabBarViewController)时,我printInn()selectedIndexPassing以查看返回的内容.它正确返回.然后,在VC2中,我将此prepareforsegue称为实际视图控制器,或标签栏中的第一个按钮：
override func prepareForSegue(segue: UIStoryboardSegue,sender: AnyObject?) {
var segue = segue.destinationViewController as PlayerFromRosterViewController
segue.selectedIndexPassingForDisplay = 1
}
但是,当我在VC3(PlayerFromRosterViewController)中printInn()selectedIndexPassingForDisplay时,我得到了nil.为什么变量没有从Tab Bar导航控制器传递到VC3,AKA是第一个标签栏按钮视图.
解决方法
您是否检查过TabBarController中的prepareForSegue是否被调用？
它永远不会被调用,因为UITabBarController与其子视图控制器之间的连接不是故事板segue.您应该通过在所需索引处访问其viewControllers集合,从UITabBarController直接获取对viewController的引用.
var tabBarController = segue.destination as UITabBarController var destinationViewController = tabBarController.viewControllers[0] as YourViewController // or whatever tab index you're trying to access destination.property = "some value"
