关闭 ViewController 不会在 Swift 中释放内存

Question

我有一个视图控制器（我们称之为 TableViewController）。当用户点击自定义 UITableViewCell 中的按钮时，一个新的视图控制器（我们称之为 DetailViewcontroller）正在打开。当用户点击 DetailViewController 内的返回按钮时，我调用了关闭函数，并且 TableViewController 再次打开。

我的问题是，当我执行 50 次这种情况时，内存使用率会更高。所以我猜它不会做任何释放。

我如何打开 DetailViewController；

    @objc func voteBtnTapped(_ sender: UIButton){
    guard let team = FirebaseManager.instance.currentTeam else { return }
    FirebaseManager.instance.delegate = nil
    let voteController = VoteViewController()
    voteController.currentTeam = team
    let transition = CATransition()
    transition.duration = 0.5
    transition.type = kCATransitionPush
    transition.subtype = kCATransitionFromRight
    transition.timingFunction = CAMediaTimingFunction(name:kCAMediaTimingFunctionEaseInEaseOut)
    view.window!.layer.add(transition, forKey: kCATransition)
    self.present(voteController, animated: false, completion: nil)
}

我如何关闭 DetailViewController；

    @objc func backBtnTapped(_ sender: UIButton){
    FirebaseManager.instance.delegate = nil
    let transition = CATransition()
    transition.duration = 0.5
    transition.type = kCATransitionPush
    transition.subtype = kCATransitionFromLeft
    transition.timingFunction = CAMediaTimingFunction(name:kCAMediaTimingFunctionEaseInEaseOut)
    view.window!.layer.add(transition, forKey: kCATransition)
    self.dismiss(animated: false, completion: nil)
}

它说仪器有泄漏，但我不知道是什么原因导致这些韭菜。

编辑：我发现我正在使用的选择器库（在 DetailViewController 中）阻止了释放。你知道它为什么会阻止它，我该如何处理它？

从回复回答我如何声明pickerView：

 let config = AZAPickerConfiguration<PickerItem>(items: (1...10).map { PickerItem(number: $0) },
                                                    defaultSelectedIndex: 4,
                                                    selectedFont: UIFont(name: "SourceSansPro-SemiBold", size: 50)!, nonSelectedFont:UIFont(name: "SourceSansPro-Light", size: 20)!, selectionRadiusInPercent: 0.5,
                                                    selectionBackgroundColor: UIColor(red:0.00, green:0.42, blue:0.20, alpha:1.0), itemWidth: 80)

    self.pickerView = AZAPicker<PickerItem>(with: config, frame: .zero)

    pickerView!.backgroundColor = .white
    pickerView!.translatesAutoresizingMaskIntoConstraints = false
    //self.pickerView!.onPickItem = self.picker
    self.pickerView!.onPickItem = {( sender : AZAPicker<PickerItem>,item:PickerItem) in
        print("didPickItem: \(item)")
        self.currentPoint = item.number

    }

https://github.com/AvanzaBank/AZAPicker

Answer 1

首先确保detailViewController是导致泄漏的对象。

deinit {
 print("detailViewController deallocated")
}

如果不调用 deinit 则有一个强引用保持 detailsViewController 活动。检查您是否在 detailViewController 中使用 self 而没有弱引用的闭包。或者您在 TableViewController 中保留 detailViewController 引用的地方。

Answer 2

那个库好像在使用形式上有错误，在示例代码中声明了这样的方法

func picker(sender: AZAPicker<PickerItem>, item: PickerItem) {
    print("didPickItem: \(item)")
}

但您需要以这种方式分配闭包并问题已解决！

已更新（在您的代码中）

self.pickerView!.onPickItem = {[weak self]( sender : AZAPicker<PickerItem>,item:PickerItem) in
    print("didPickItem: \(item)")
    self.currentPoint = item.number

}

完整代码参考

class ViewController: UIViewController {

    @IBAction func dismiss(_ sender: Any) {
        self.dismiss(animated: true, completion: nil)
    }
    override func viewDidLoad() {
        super.viewDidLoad()

        let config = AZAPickerConfiguration<PickerItem>(items: (1...100).map { PickerItem(number: $0) },
                                           defaultSelectedIndex: 99,
                                           selectionRadiusInPercent: 0.5,
                                           itemWidth: 80)

        let pickerView = AZAPicker<PickerItem>(with: config, frame: .zero)

        pickerView.backgroundColor = .white
        //in this code [weak self] is not needed because I don't use self inside the closure
        pickerView.onPickItem = {( sender : AZAPicker<PickerItem>,item:PickerItem) in
            print("didPickItem: \(item)")
        }

        pickerView.translatesAutoresizingMaskIntoConstraints = false

        view.addSubview(pickerView)

        NSLayoutConstraint(item: pickerView, attribute: .top, relatedBy: .equal, toItem: topLayoutGuide, attribute: .top, multiplier: 1, constant: 20).isActive = true

        NSLayoutConstraint(item: pickerView, attribute: .leading, relatedBy: .equal, toItem: view, attribute: .leading, multiplier: 1, constant: 0).isActive = true

        NSLayoutConstraint(item: pickerView, attribute: .trailing, relatedBy: .equal, toItem: view, attribute: .trailing, multiplier: 1, constant: 0).isActive = true

        NSLayoutConstraint(item: pickerView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 80).isActive = true
    }

}