我有一个名为的局部变量bomb tower.代码如下:
if checkMark.contains(touchLocation) {
let bombTowerLevel1 = SKSpriteNode(imageNamed: "bomb tower trial 2")
bombTowerLevel1.name = "bomb tower" //change later maybe
bombTowerLevel1.position = bombTowerGhost.position
bombTowerLevel1.zPosition = 1 //change later for health
bombTowerLevel1.setScale(frame.size.height/2500)
self.addChild(bombTowerLevel1)
}
我稍后使用name这里访问它:
func turretShoot() {
let bombTower = self.childNode(withName: "bomb tower") as! SKSpriteNode
bombTower.zRotation = mainturret.zRotation
}
让我明确一下,场景中可能有多个炸弹塔,因此我没有做出bomb tower全局变量.当前代码的问题在于,当我放置一个以上的炸弹塔时,该功能中的动作仅由放置的第一个炸弹塔执行.关于如何访问局部变量并使每一个炸弹塔转向的任何想法？
我在相机应用程序中有这个
session.sessionPreset = AVCaptureSession.Preset.high
camera = AVCaptureDevice.default(for: AVMediaType.video)
do {
let cameraCaptureInput = try AVCaptureDeviceInput(device: camera!)
cameraCaptureOutput = AVCapturePhotoOutput()
session.addInput(cameraCaptureInput)
session.addOutput(cameraCaptureOutput!)
} catch {
print(error.localizedDescription)
}
如何访问前置摄像头？
class ViewController3: UIViewController {
let session = AVCaptureSession()
var camera : AVCaptureDevice?
var cameraPreviewLayer : AVCaptureVideoPreviewLayer?
var cameraCaptureOutput : AVCapturePhotoOutput
我很困惑,因为我在不同的相机应用程序中使用了完全相同的代码,但无论出于何种原因,我收到错误,说viewcontroller没有初始化器.我该如何修复错误？