实例化View Controller Swift 3 Tab Bar Controller

Question

我如何选择标签栏控制器？标签上有2个视图控制器，其中包含导航控制器，标签栏控制器上有一个导航控制器。

let storyboard = UIStoryboard(name: "PendingOverview", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "PendingOverviewVC") as! PendingOverViewController
let nc = UINavigationController(rootViewController: vc)
self.present(nc, animated: false, completion: nil)

谢谢

Answer 1

在Storyboard集标识符UITabbarController，然后使用instantiateViewController本那个UITabbarController。

let storyboard = UIStoryboard(name: "PendingOverview", bundle: nil)
let tabbarVC = storyboard.instantiateViewController(withIdentifier: "TabbarIdentifier") as! UITabbarController
if let vcs = tabbarVC.viewControllers, 
   let nc = vcs.first as? UINavigationController,
   let pendingOverVC = nc.topViewController as? PendingOverViewController {

      pendingOverVC.pendingResult = pendingResult
}
self.present(tabbarVC, animated: false, completion: nil)