swift - 模拟器工作但再次呈现 UiViewController 时设备崩溃

Question

我一直在开发一款具有不同关卡的游戏，您可以通过菜单访问这些关卡。关卡是 3D 的并使用 SceneKit，菜单是 2D 的并使用 SpriteKit。

游戏从第 1 级开始，这是一个 UiViewController，当你击败它时，菜单就会出现。如果你在菜单中按下一个按钮(上面写着“Level 1”)，你将被引导回到 level 1，但是由于某种原因在 iPhone 上再次加载 level 1 时，它崩溃了，但模拟器工作正常。

我这里有一个简单的示例代码，它做的事情几乎相同，并且只在设备上崩溃:

import UIKit
import QuartzCore
import SceneKit

class GameViewController: UIViewController {


func ajrj() {
presentViewController(GameViewController(), animated: true, completion: nil)
}


override func viewDidLoad() {
    super.viewDidLoad()
    self.view = SCNView()
    var jarrarar = NSTimer.scheduledTimerWithTimeInterval(2, target: self, selector: #selector(GameViewController.ajrj), userInfo: nil, repeats: true)
    // create a new scene
    let scene = SCNScene(named: "art.scnassets/ship.scn")!

    // create and add a camera to the scene
    let cameraNode = SCNNode()
    cameraNode.camera = SCNCamera()
    scene.rootNode.addChildNode(cameraNode)

    // place the camera
    cameraNode.position = SCNVector3(x: 0, y: 0, z: 15)

    // create and add a light to the scene
    let lightNode = SCNNode()
    lightNode.light = SCNLight()
    lightNode.light!.type = SCNLightTypeOmni
    lightNode.position = SCNVector3(x: 0, y: 10, z: 10)
    scene.rootNode.addChildNode(lightNode)

    // create and add an ambient light to the scene
    let ambientLightNode = SCNNode()
    ambientLightNode.light = SCNLight()
    ambientLightNode.light!.type = SCNLightTypeAmbient
    ambientLightNode.light!.color = UIColor.darkGrayColor()
    scene.rootNode.addChildNode(ambientLightNode)

    // retrieve the ship node
    let ship = scene.rootNode.childNodeWithName("ship", recursively: true)!

    // animate the 3d object
    ship.runAction(SCNAction.repeatActionForever(SCNAction.rotateByX(0, y: 2, z: 0, duration: 1)))

    // retrieve the SCNView
    let scnView = self.view as! SCNView

    // set the scene to the view
    scnView.scene = scene

    // allows the user to manipulate the camera
    scnView.allowsCameraControl = true

    // show statistics such as fps and timing information
    scnView.showsStatistics = true

    // configure the view
    scnView.backgroundColor = UIColor.blackColor()

    // add a tap gesture recognizer
    let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTap(_:)))
    scnView.addGestureRecognizer(tapGesture)
}

func handleTap(gestureRecognize: UIGestureRecognizer) {
    // retrieve the SCNView
    let scnView = self.view as! SCNView

    // check what nodes are tapped
    let p = gestureRecognize.locationInView(scnView)
    let hitResults = scnView.hitTest(p, options: nil)
    // check that we clicked on at least one object
    if hitResults.count > 0 {
        // retrieved the first clicked object
        let result: AnyObject! = hitResults[0]

        // get its material
        let material = result.node!.geometry!.firstMaterial!

        // highlight it
        SCNTransaction.begin()
        SCNTransaction.setAnimationDuration(0.5)

        // on completion - unhighlight
        SCNTransaction.setCompletionBlock {
            SCNTransaction.begin()
            SCNTransaction.setAnimationDuration(0.5)

            material.emission.contents = UIColor.blackColor()

            SCNTransaction.commit()
        }

        material.emission.contents = UIColor.redColor()

        SCNTransaction.commit()
    }
}

override func shouldAutorotate() -> Bool {
    return true
}

override func prefersStatusBarHidden() -> Bool {
    return true
}

override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
    if UIDevice.currentDevice().userInterfaceIdiom == .Phone {
        return .AllButUpsideDown
    } else {
        return .All
    }
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Release any cached data, images, etc that aren't in use.
}

}

那么这是一个错误吗？我应该只相信模拟器吗？这是呈现 View Controller 的糟糕方式吗？为什么会在设备上崩溃？

Answer 1

UIViewController 没有不带参数的初始化器。你应该使用这个:

public init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?)

并为其提供 xib 文件的名称。模拟器可以处理这种情况 - 它猜测 xib，但设备没有。