快速关闭变量并导致内存泄漏 [英] Swift closure with variable causing memory leak

问题描述

我正在调试带有内存泄漏问题的程序. 在ViewController中，当弹出它时，应调用deinit函数.但这没有，所以我尝试通过以下步骤弄清楚.

I am debugging my program with a memory leak issue. In the ViewController, when it is pop out, the deinit function should be called. But it didnt, so I try to figure it out with the following step.

通过注释很多行，我发现以下几行使ViewController没有取消分配.

by commenting many lines, I found that the following lines make the ViewController didnt dealloc.

var api:APIGetList = APIGetList(tripId: trip.id, offsetToken: offsetToken,shouldRemoveAll:self.shouldRemoveAll)
api.request({ (obj, error) -> Void in
    //ingore here
    }, immediateHandler: {[unowned self](obj) -> Void in
        if var tripPosts = obj as? [TripPost]{
            self.tripPosts = tripPosts<--- this line cause the leak
        }
        self.tableView.reloadData()

    }, failHandler: { (errCode, errMsg, error) -> Void in
        self.isLoading = false
        self.refreshControl.endRefreshing()
})

在我的ViewController中，我将调用api以获取数据，并替换当前的tripPosts列表.我提到的这一行是此行导致泄漏"，当我对其进行注释时，调用deinit.所以我认为这是问题的原因.

in my ViewController, I will call the api to get data, and replace the current tripPosts list. the line I mentioned as "this line cause the leak", when I comment it, the deinit called. So I think this line is the cause of the problem.

用于回叫对象-obj.它来自以下代码:

for the call back object - obj. It comes from the following codes:

var tripPosts = [TripPost]()
tripPosts = TripPost.MR_findAll()
immediateHandler(obj: tripPosts)

那什么导致内存泄漏呢?

so what cause the memory leak??

推荐答案

尝试在api.request({在

Try putting [weak self] soon after the api.request({ in

  var api:APIGetList = APIGetList(tripId: trip.id, offsetToken: offsetToken,shouldRemoveAll:self.shouldRemoveAll)

        api.request({ [weak self](obj, error) -> Void in
            //ingore here
            }, immediateHandler: {[weak self](obj) -> Void in
                if var tripPosts = obj as? [TripPost]{
                    self.tripPosts = tripPosts<--- this line cause the leak
                }
                self.tableView.reloadData()

            }, failHandler: {[weak self] (errCode, errMsg, error) -> Void in
                self.isLoading = false
                self.refreshControl.endRefreshing()
        })

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