在我正在开发的应用程序中,需要定期轮询设备的数据,如加速度,陀螺仪和运动。我编写了以下课程来处理所有相关任务(我还使用第三方库SOMotionDetector来检测设备是否正在移动,如果只有这样,我会调用didReceiveAcceleration
委托方法)。代码中潜在的内存泄漏
import CoreMotion
import Foundation
import SOMotionDetector
protocol MotionManagerDelegate: class {
func didReceiveAcceleration(_ acceleration: (x: Double, y: Double, z: Double))
func didReceiveGyro(_ gyro: (x: Double, y: Double, z: Double))
func didReceiveMotion(_ motion: (x: Double, y: Double, z: Double, w: Double))
}
class MotionManager: NSObject {
weak var delegate: MotionManagerDelegate?
fileprivate let motionDetector = SOMotionDetector.sharedInstance()
fileprivate let accelerationCaptureInterval: TimeInterval = 0.02
fileprivate let gyroCaptureInterval: TimeInterval = 1
fileprivate var lastAcceleration: (x: Double, y: Double, z: Double) = (x: 0.0, y: 0.0, z: 0.0)
fileprivate var isMoving: Bool = false
fileprivate var motionManager: CMMotionManager!
override init() {
super.init()
motionManager = CMMotionManager()
motionManager.gyroUpdateInterval = gyroCaptureInterval
motionManager.accelerometerUpdateInterval = accelerationCaptureInterval
motionManager.deviceMotionUpdateInterval = gyroCaptureInterval
motionDetector?.useM7IfAvailable = true
}
func startCapturing() throws {
motionManager.startGyroUpdates(to: OperationQueue()) { gyroData, error in
if let rotation = gyroData?.rotationRate {
let gyro = (x: rotation.x, y: rotation.y, z: rotation.z)
self.delegate?.didReceiveGyro(gyro)
} else {
let gyro = (x: 0.0, y: 0.0, z: 0.0)
self.delegate?.didReceiveGyro(gyro)
}
}
motionDetector?.motionTypeChangedBlock = { motionType in
if motionType == MotionTypeNotMoving {
self.isMoving = false
} else {
self.isMoving = true
}
}
motionDetector?.startDetection()
motionManager.startAccelerometerUpdates(to: OperationQueue()) { accelerometerData, error in
var x = 0.0
var y = 0.0
var z = 0.0
if let acceleration = accelerometerData?.acceleration {
x = acceleration.x
y = acceleration.y
z = acceleration.z
}
if self.isMoving {
if let delegate = self.delegate {
delegate.didReceiveAcceleration((x: x, y: y, z: z))
}
}
}
motionManager.startDeviceMotionUpdates(to: OperationQueue()) { motionData, error in
if let quaternion = motionData?.attitude.quaternion {
let motion = (x: quaternion.x, y: quaternion.y, z: quaternion.z, w: quaternion.w)
self.delegate?.didReceiveMotion(motion)
}
}
}
func stopCapturing() {
motionManager.stopGyroUpdates()
motionManager.stopAccelerometerUpdates()
motionManager.stopDeviceMotionUpdates()
motionDetector?.stopDetection()
}
}
这工作正常。但是我得到随机崩溃报告,说代码中有内存泄漏/堆损坏。由于我无法附加调试器并随电话上运行的应用程序一起移动,因此我无法确定发生这种情况的位置。
我非常感谢任何帮助,找出有问题的代码可能是什么。我的任何代码是否容易出现像保留周期这样的问题?
我看不出有什么明显的。你可能想用你在其他地方使用的语法替换你的“if let delegate = self.delegate {...}”否则我唯一可以建议的是使用Xcode Instruments特别是题为“泄漏”的报道。 – ekscrypto