xcode 在解除分配时尝试加载视图控制器的视图
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Attempting to load the view of a view controller while it is deallocating
提问by Latheesan
I am learning to implement TableView with Search Bar and data filtering. So, I have the following in my storyboard:
我正在学习使用搜索栏和数据过滤来实现 TableView。所以，我有以下内容storyboard：
My UITableViewControlleris connected to the following SearchTableViewController.swiftclass like this:
我UITableViewController的连接到以下SearchTableViewController.swift类是这样的：
import UIKit
class SearchTableViewController: UITableViewController, UISearchResultsUpdating {
// table view controller properties
let appleProducts = ["Mac", "iPhone", "Apple Watch", "iMac", "iPad"]
var filteredAppleProducts = [String]()
var resultSearchController = UISearchController()
override func viewDidLoad() {
super.viewDidLoad()
// Configure result search controller
self.resultSearchController = UISearchController(searchResultsController: nil)
self.resultSearchController.searchResultsUpdater = self
self.resultSearchController.dimsBackgroundDuringPresentation = false
self.resultSearchController.searchBar.sizeToFit()
self.resultSearchController.searchBar.placeholder = "Search Products"
self.tableView.tableHeaderView = self.resultSearchController.searchBar
self.tableView.reloadData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if (self.resultSearchController.active) {
return self.filteredAppleProducts.count
} else {
return self.appleProducts.count
}
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as UITableViewCell
if (self.resultSearchController.active) {
cell.textLabel?.text = self.filteredAppleProducts[indexPath.row]
} else {
cell.textLabel?.text = self.appleProducts[indexPath.row]
}
return cell
}
func updateSearchResultsForSearchController(searchController: UISearchController) {
self.filteredAppleProducts.removeAll(keepCapacity: false)
let searchPredicate = NSPredicate(format: "SELF CONTAINS[c] %@", searchController.searchBar.text!)
let resultArray = (self.appleProducts as NSArray).filteredArrayUsingPredicate(searchPredicate)
self.filteredAppleProducts = resultArray as! [String]
self.tableView.reloadData()
}
}
This runs fine and filtering is working as expected:
这运行良好，过滤按预期工作：
However, when the app is running in the simulator, I get the following warning in the debug window:
但是，当应用程序在模拟器中运行时，我在调试窗口中收到以下警告：
2015-09-07 00:02:46.116 TableViewSearch[2415:68217] Attempting to load the view of a view controller while it is deallocating is not allowed and may result in undefined behavior ()
2015-09-07 00:02:46.116 TableViewSearch[2415:68217] 不允许在解除分配时尝试加载视图控制器的视图，这可能会导致未定义的行为 ()
Any ideas how to fix this?
任何想法如何解决这一问题？
回答by MichikoP
I spent all day to understand this problem too... Some said it's related to Navigation Controller issue and others said it's a glitch. Although this may not be the correct answer, hope I can give some hint. If you think it's not a correct approach, let me know. Thanks. My case is as follows instead (because of a different design, I think.)
我也花了一整天的时间来理解这个问题......有人说它与导航控制器问题有关，其他人说这是一个小故障。虽然这可能不是正确的答案，但希望我能给一些提示。如果您认为这不是正确的方法，请告诉我。谢谢。我的情况如下（我认为是因为设计不同。）
var resultSearchController: UISearchController!()
Then, I had to add below.
然后，我不得不在下面添加。
self.resultSearchController.loadViewIfNeeded()
回答by Apoorv Mote
Just change following line
只需更改以下行
var resultSearchController = UISearchController()
to following line
到以下行
var resultSearchController:UISearchController!
Your rest of the code is ok. Only that one change is required.
你的其余代码没问题。只需要进行一项更改。
If you want to see detailed explanation then check my tutorial on UISearchController
如果您想查看详细说明，请查看我在 UISearchController 上的教程
