ios - 内存使用量随着每个 segue 到模态 vc 的增加而增加

Question

我有两个 View Controller ，一个是时间线，第二个是用于创建。在第二个 View Controller 中，我有一个 subview 。这个 subview 是一个 SKView。现在每次我使用它时，它都会增加 2mb 的内存使用量(在真实设备上)，但是当我展开它时内存使用量保持不变。
所以它是这样的:我开始使用 12mb，然后它变成 14-15mb。展开后，它保持在 14-15mb 左右。在第二次 segue 之后，它变成 17mb...等等。

这是时间轴 Controller 中使用的代码:

@IBAction func createButtonAct(sender: AnyObject) {

    self.performSegueWithIdentifier("create", sender: self)


}

@IBAction func unwindFromCreation(segue: UIStoryboardSegue) {


}




// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    if segue.identifier == "create"{
        let vc = segue.destinationViewController as! CreateViewController
        if vc.currCountry == nil || vc.currCountry != self.currCountry{
        vc.currCountry = self.currCountry
        }

    }


}

这是创建 View Controller 的代码:

class CreateViewController: UIViewController, UITextViewDelegate {

@IBOutlet weak var bubbleView: SKView!

@IBOutlet var arrow: UIButton!

var ref: Firebase!


let categories = CatsAndColors.categories


@IBOutlet var doneButton: UIButton!

@IBOutlet var titleField: UITextField!

@IBOutlet var descriptionView: KMPlaceholderTextView!

var choosedCat: String!

var selectedCats: NSMutableArray!

var currCountry:String!

var tap: UITapGestureRecognizer!

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(true)

    UIApplication.sharedApplication().statusBarStyle = .Default
    UIView.animateWithDuration(0.5, animations: { () -> Void in
        self.arrow.transform = CGAffineTransformMakeRotation(3.14159)
    })



    titleField.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged) 

    titleField.addTarget(self, action: "textFieldDidBegin:", forControlEvents: UIControlEvents.EditingDidBegin)

    titleField.addTarget(self, action: "textFieldDidEnd:", forControlEvents: UIControlEvents.EditingDidEnd)
    // the targets get removed in viewWillDisappear
    selectedCats = NSMutableArray()

}



override func viewDidLoad() {
    super.viewDidLoad()

    ref = Firebase(url: "https://blabber2.firebaseio.com")

    self.doneButton.enabled = false

    doneButton.setBackgroundImage(UIImage(named: "Done button inactive"), forState: .Disabled)

    doneButton.setTitleColor(UIColor(netHex: 0xF6F6F6), forState: .Disabled)

    doneButton.setTitleColor(UIColor.whiteColor(), forState: .Normal)

    self.setupBubbles()

    self.descriptionView.delegate = self

}

func setupBubbles(){



    let floatingCollectionScene = ChooseBubblesScene(size: bubbleView.bounds.size)

    // floatingCollectionScene.scaleMode = .AspectFit


    /*let statusBarHeight = CGRectGetHeight(UIApplication.sharedApplication().statusBarFrame)
    let titleLabelHeight = CGRectGetHeight(self.tibleLabel.frame)*/

    bubbleView.presentScene(floatingCollectionScene)



    for (category, color) in categories {

        let node = ChooseBubbleNode.instantiate()
        node!.vc = self
        node!.fillColor = SKColor(netHex: color)
        node!.strokeColor = SKColor(netHex: color)
        node!.labelNode.text = category

        floatingCollectionScene.addChild(node!)

    }


}
...

catsAndColors 结构如下所示:

struct CatsAndColors{

static var categories = ["Crime":0x5F5068, "Travel":0xFBCB43, "Religion":0xE55555, "Tech":0xAF3151, "Economy":0x955BA5, "Games":0xE76851, "Climate":0x6ED79A, "Books":0xE54242, "History":0x287572, "Clothes":0x515151, "Sports":0x4AB3A7, "Food":0xD87171, "Politics":0x5FA6D6, "Music":0xDD2E63, "Tv-shows":0x77A7FB]

 }

Answer 1

也许您已经在 View Controller 之间创建了某种保留循环。
如果两个 View Controller 都持有对彼此的引用，则尝试将其中一个引用声明为 weak。

有关该主题的更多信息，请阅读 Resolving Strong Reference Cycles Between Class Instances .