Question

首先想知道如何调试问题所在，什么是无限期地停止主线程。我读到某个地方，一旦我的应用程序冻结，我应该暂停它并看到线程，我能够看到这么长时间内占用的东西。我做到了但我无法找出原因。

其次，我还应该提一下我的场景，因为冻结总是可以重复的。我点击tableViewController（通过UILabel）打开TapGestureRecongniser。用户可以在tableViewController中选择多个单元格，UILabel可以反映用户在tableViewController中选择的值。我有一个中央ContentManager来处理应用程序的内容。 tableViewController更改了ContentManager和UILabel次提取的列表，以便自行更新。一切都很好，直到这里。如果我再次打开TableViewController，该应用会冻结。仅当用户更改了所选单元格时才会发生这种情况。如果用户打开tableViewController但未更改任何单元格的选定状态并按下，则应用程序在再次打开时不会冻结。这是我的tableViewController

的代码

import UIKit
import SwiftEventBus

class InterestsTableViewController: UITableViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        title = "Select Your Interests"

        navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Select", style: .Plain, target: self, action: #selector(addTapped))
        navigationItem.rightBarButtonItem?.enabled = false

        self.clearsSelectionOnViewWillAppear = false
        setPreSelectedCells()
    }

    func setPreSelectedCells() {
        var interestList = ContentManager.shared.getInterests()!

        if interestList.count > 0 {

            for i in 0..<interestList.endIndex {

                let interest  = interestList[i]
                let indexPath = NSIndexPath(forRow: 0, inSection: i)

                if interest.isSelected {

                    tableView.selectRowAtIndexPath(indexPath, animated: false, scrollPosition: UITableViewScrollPosition.None)
                    self.tableView(self.tableView, didSelectRowAtIndexPath: indexPath);
                } else {

                    tableView.deselectRowAtIndexPath(indexPath, animated: false)
                    self.tableView(self.tableView, didDeselectRowAtIndexPath: indexPath);
                }
            }
        }
    }

    func addTapped() {
        print("interests selected")
        print(tableView.indexPathsForSelectedRows?.count)

        if let indexPaths = tableView.indexPathsForSelectedRows {

            var selectedInterests : [String] = []
            for indexPath in indexPaths {
                selectedInterests.append(ContentManager.shared.getInterests()![indexPath.section].id)
            }

            if selectedInterests.count > 0 {
                ApiCallsManager.updateInterests(selectedInterests)
                navigationController?.popViewControllerAnimated(true)
            }
        }
    }

    // MARK: - Table view data source
    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {

        if ContentManager.shared.getInterests() != nil {
            return ContentManager.shared.getInterests()!.count
        } else {
            return 0
        }
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 1
    }

    override func tableView(tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return 10.0
    }

    override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView {

        let headerView: UIView = UIView()
        headerView.backgroundColor = UIColor.clearColor()
        return headerView
    }

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

        let cell = tableView.dequeueReusableCellWithIdentifier("InterestsTableViewCell", forIndexPath: indexPath) as! InterestsTableViewCell

        let interest = ContentManager.shared.getInterests()![indexPath.section]
        cell.interestLabel.text = interest.getCategory()
        cell.picture.kf_setImageWithURL(NSURL(string: interest.picture)!)

        if cell.selected {
            cell.filter.alpha = 0.85
        } else {
            cell.filter.alpha = 0.3
        }

        return cell
    }

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

        if let cell = tableView.cellForRowAtIndexPath(indexPath) as? InterestsTableViewCell {
                    cell.filter.alpha = 0.85

            if let count = tableView.indexPathsForSelectedRows?.count {
                navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Select (\(count))", style: .Plain, target:    self, action: #selector(addTapped))
        } else {
                navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Select", style: .Plain, target:    self, action: #selector(addTapped))
                navigationItem.rightBarButtonItem?.enabled = false
            }
        }
    }

    override func tableView(tableView: UITableView, didDeselectRowAtIndexPath indexPath: NSIndexPath) {

        if let cell = tableView.cellForRowAtIndexPath(indexPath) as? InterestsTableViewCell  {
            cell.filter.alpha = 0.3

            if let count = tableView.indexPathsForSelectedRows?.count {
                navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Select (\(count))", style: .Plain, target:    self, action: #selector(addTapped))
            } else {
                navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Select", style: .Plain, target:    self, action: #selector(addTapped))
                navigationItem.rightBarButtonItem?.enabled = false
            }
        }
    }
}

感谢。

打开tableViewController时应用程序冻结

0 个答案: