ios - searchResultsUpdater 的其他 ViewController
<p><p>如何为 <code>searchResultsUpdater</code> 设置另一个 <code>ViewController</code>？
我试着这样做，但结果没有更新。</p>
<pre><code>let searchNav = storyboard!.instantiateViewController(withIdentifier: "SearchControllerNav") as! UINavigationController
let vc = searchNav.topViewController as! PageMenuVC
let searchVC = storyboard!.instantiateViewController(withIdentifier: "SearchVC") as! SearchVC
self.searchController = UISearchController(searchResultsController: vc)
vc.searchController.searchResultsUpdater = searchVC
</code></pre>
<p>这是我的 PageMenuVC:</p>
<pre><code>override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
var controllerArray : = []
let searchVC = storyboard?.instantiateViewController(withIdentifier: "SearchVC")
controllerArray.append(searchVC!)
let testVC = storyboard?.instantiateViewController(withIdentifier: "test")
controllerArray.append(testVC!)
// Customize menu (Optional)
let parameters: = [
.scrollMenuBackgroundColor(UIColor(red: 30.0/255.0, green: 30.0/255.0, blue: 30.0/255.0, alpha: 1.0)),
.viewBackgroundColor(UIColor(red: 20.0/255.0, green: 20.0/255.0, blue: 20.0/255.0, alpha: 1.0)),
.selectionIndicatorColor(UIColor.orange),
.bottomMenuHairlineColor(UIColor(red: 70.0/255.0, green: 70.0/255.0, blue: 80.0/255.0, alpha: 1.0)),
.menuItemFont(UIFont(name: "HelveticaNeue", size: 13.0)!),
.menuHeight(40.0),
.menuItemWidth(90.0),
.centerMenuItems(true)
]
// Initialize scroll menu
pageMenu = CAPSPageMenu(viewControllers: controllerArray, frame: CGRect(x: 0.0, y: 0.0, width: self.view.frame.width, height: self.view.frame.height), pageMenuOptions: nil)
self.addChildViewController(pageMenu!)
self.view.addSubview(pageMenu!.view)
pageMenu!.didMove(toParentViewController: self)
}
</code></pre>
<p>在 <code>SearchVC</code> 我有这个功能:</p>
<pre><code>//MARK: Filter
func filterContentForSearchText(searchText: String, scope: String = "All") {
filteredUsers = allUsers.filter { user in
return user.name.lowercased().contains(searchText.lowercased())
}
collectionView.reloadData()
}
//MARK: SearchResultDelegate
func updateSearchResults(for searchController: UISearchController) {
let searchBarText = searchController.searchBar.text!
filterContentForSearchText(searchText: searchBarText)
self.searchController = searchController
collectionView.reloadData()
}
</code></pre>
<p>如果您需要更多信息，请告诉我!</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我认为您需要将实例化的 ViewController 保留在 <code>self</code>ViewController 的(私有(private))属性中:如果将其设置为 <code>vc.searchController.searchResultsUpdater</code>，这只是一个 <code>weak</code> 引用，因此如果你不将 <code>searchVC</code> 存储在 <code>self</code> 中，它会很快被销毁(只是在代码块的末尾)。 searchNav 也是如此(但我认为这将被呈现，因此我将在下面跳过它):</p>
<pre><code>class MyVC : UIViewController {
var searchVC:UIViewController?
// ...
func XYZ() {
let searchNav = storyboard!.instantiateViewController(withIdentifier: "SearchControllerNav") as! UINavigationController
let vc = searchNav.topViewController as! PageMenuVC
// Store searchVC in property:
self.searchVC = storyboard!.instantiateViewController(withIdentifier: "SearchVC") as! SearchVC
self.searchController = UISearchController(searchResultsController: vc)
vc.searchController.searchResultsUpdater = searchVC
self.present(searchNav, animated:true, completion:nil)
}
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - searchResultsUpdater 的其他 ViewController，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/42218091/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/42218091/
</a>
</p>
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