Ios Swift通知中心导致内存泄漏
第一次海报。我对Swift、编码和通用性非常陌生，遇到了一个我似乎无法解决的问题 在我的代码中，我有两个视图控制器。第一视图控制器允许用户查看蓝牙设备，并选择要连接的设备。当用户选择设备时，它会转到第二视图控制器，该控制器显示来自蓝牙设备的温度数据 这一切都很好，但如果我回到第一个视图控制器，然后再次选择相同的设备，我现在会从该设备收到两个相同的温度读数。（蓝牙设备从我的代码中接收到两个相同的命令，并返回两个值） 实际上，每次我在视图控制器之间来回切换时，似乎都会创建视图控制器的另一个实例，从而造成内存泄漏。（如果我前后切换五次，每次单击按钮接收值时，我将收到五个蓝牙读数） 我相信我的问题在于我创建和解雇了通知中心观察员，但我似乎无法找到正确的解决方案 我遗漏了我觉得与我的问题无关的代码，所以如果我遗漏了解决问题所需的任何代码，请告诉我。任何帮助都将不胜感激 //第一视图控制器Ios Swift通知中心导致内存泄漏,ios,swift,memory,bluetooth,notifications,Ios,Swift,Memory,Bluetooth,Notifications,第一次海报。我对Swift、编码和通用性非常陌生，遇到了一个我似乎无法解决的问题 在我的代码中，我有两个视图控制器。第一视图控制器允许用户查看蓝牙设备，并选择要连接的设备。当用户选择设备时，它会转到第二视图控制器，该控制器显示来自蓝牙设备的温度数据 这一切都很好，但如果我回到第一个视图控制器，然后再次选择相同的设备，我现在会从该设备收到两个相同的温度读数。（蓝牙设备从我的代码中接收到两个相同的命令，并返回两个值） 实际上，每次我在视图控制器之间来回切换时，似乎都会创建视图控制器的另一个实例，从而
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
print("*****************************")
print("Connection complete")
print("Peripheral info: \(String(describing: blePeripheral))")
//Stop Scan- We don't need to scan once we've connected to a peripheral. We got what we came for.
centralManager?.stopScan()
print("Scan Stopped")
//Erase data that we might have
data.length = 0
//Discovery callback
peripheral.delegate = self
//Only look for services that matches transmit uuid
peripheral.discoverServices(nil)
performSegue(withIdentifier: "Go", sender: nil)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let destination = segue.destination as! TempPage
destination.peripheral = blePeripheral
}
func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
if characteristic == rxCharacteristic {
if let ASCIIstring = NSString(data: characteristic.value!, encoding: String.Encoding.utf8.rawValue) {
characteristicASCIIValue = ASCIIstring
NotificationCenter.default.post(name:NSNotification.Name(rawValue: "Notify"), object: nil)
connectionStatus = "Connected!"
}
}
override func viewDidLoad() {
super.viewDidLoad()
//Create and start the peripheral manager
peripheralManager = CBPeripheralManager(delegate: self, queue: nil)
//-Notification for updating the text view with incoming text
updateIncomingData()
}
override func viewDidDisappear(_ animated: Bool) {
peripheralManager?.stopAdvertising()
self.peripheralManager = nil
super.viewDidDisappear(animated)
NotificationCenter.default.removeObserver(self)
}
func updateIncomingData () {
NotificationCenter.default.addObserver(forName: NSNotification.Name(rawValue: "Notify"), object: nil , queue: nil){
notification in
if characteristicASCIIValue != nil
{
self.rawValue = characteristicASCIIValue as String
print(characteristicASCIIValue)
}
self.batteryLevelLabel.text = ("\(String(batteryLevel))%")
}
@IBAction func returnToFirstViewController(_ sender: Any) {
navigationController?.popViewController(animated: true)
dismiss(animated: true, completion: nil)
}
}
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
print("*****************************")
print("Connection complete")
print("Peripheral info: \(String(describing: blePeripheral))")
//Stop Scan- We don't need to scan once we've connected to a peripheral. We got what we came for.
centralManager?.stopScan()
print("Scan Stopped")
//Erase data that we might have
data.length = 0
//Discovery callback
peripheral.delegate = self
//Only look for services that matches transmit uuid
peripheral.discoverServices(nil)
performSegue(withIdentifier: "Go", sender: nil)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let destination = segue.destination as! TempPage
destination.peripheral = blePeripheral
}
func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
if characteristic == rxCharacteristic {
if let ASCIIstring = NSString(data: characteristic.value!, encoding: String.Encoding.utf8.rawValue) {
characteristicASCIIValue = ASCIIstring
NotificationCenter.default.post(name:NSNotification.Name(rawValue: "Notify"), object: nil)
connectionStatus = "Connected!"
}
}
override func viewDidLoad() {
super.viewDidLoad()
//Create and start the peripheral manager
peripheralManager = CBPeripheralManager(delegate: self, queue: nil)
//-Notification for updating the text view with incoming text
updateIncomingData()
}
override func viewDidDisappear(_ animated: Bool) {
peripheralManager?.stopAdvertising()
self.peripheralManager = nil
super.viewDidDisappear(animated)
NotificationCenter.default.removeObserver(self)
}
func updateIncomingData () {
NotificationCenter.default.addObserver(forName: NSNotification.Name(rawValue: "Notify"), object: nil , queue: nil){
notification in
if characteristicASCIIValue != nil
{
self.rawValue = characteristicASCIIValue as String
print(characteristicASCIIValue)
}
self.batteryLevelLabel.text = ("\(String(batteryLevel))%")
}
@IBAction func returnToFirstViewController(_ sender: Any) {
navigationController?.popViewController(animated: true)
dismiss(animated: true, completion: nil)
}
}
尝试在notification center回调中将self捕获为无主或弱：
func updateIncomingData（）{
NotificationCenter.default.addObserver（forName:NSNotification.Name（rawValue:“Notify”），对象：nil，队列：nil）{
如果特征为SCIVALUE！=无
{
self.rawValue=characteristicascivalue作为字符串
印刷品（特征科学版）
}
self.batteryLevelLabel.text=（“\（字符串（batteryLevel））%”）
}
本文可能很有用：尝试在notification center回调中将self捕获为无主或弱：
func updateIncomingData（）{
NotificationCenter.default.addObserver（forName:NSNotification.Name（rawValue:“Notify”），对象：nil，队列：nil）{
如果特征为SCIVALUE！=无
{
self.rawValue=characteristicascivalue作为字符串
印刷品（特征科学版）
}
self.batteryLevelLabel.text=（“\（字符串（batteryLevel））%”）
}
这篇文章可能很有用：Hi！我相信你的问题不在于NotificationController（你给出的代码似乎一切正常），而在于其他方面：我相信你在SecondViewController的某个地方有一个很强的引用循环。添加
print（self）