在我的 Swift 应用程序中，我有一个 View 可以找到蓝牙设备并连接到它。蓝牙设备已开机。我能够扫描并找到该设备，之后我调用该功能连接到它，但我没有得到任何反馈。我不确定为什么无法连接。
didFailToConnectPeripheral 或 didConnectPeripheral 均未返回任何值。
我如何让它工作？
import UIKit
import CoreBluetooth
class ViewController: UIViewController, CBCentralManagerDelegate, CBPeripheralDelegate {
var manager: CBCentralManager!
override func viewDidLoad() {
super.viewDidLoad()
manager = CBCentralManager (delegate: self, queue: nil)
}
func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {
print("Peripheral: \(peripheral)")
manager.connectPeripheral(peripheral, options:nil)
manager.stopScan()
}
func centralManager(central: CBCentralManager, didConnectPeripheral peripheral: CBPeripheral) {
print("connected!")
}
func centralManager(central: CBCentralManager, didDisconnectPeripheral
peripheral: CBPeripheral, error: NSError?) {
print("disconnected!")
}
func centralManager(central: CBCentralManager,
didFailToConnectPeripheral peripheral: CBPeripheral, error: NSError?) {
print("failed")
}
func centralManagerDidUpdateState(central: CBCentralManager) {
print("Checking")
switch(central.state)
{
case.Unsupported:
print("BLE is not supported")
case.Unauthorized:
print("BLE is unauthorized")
case.Unknown:
print("BLE is Unknown")
case.Resetting:
print("BLE is Resetting")
case.PoweredOff:
print("BLE service is powered off")
case.PoweredOn:
print("BLE service is powered on")
print("Start Scanning")
manager.scanForPeripheralsWithServices(nil, options: nil)
default:
print("default state")
}
}
}
最佳答案
您需要保留您尝试连接的 CBPeripheral 对象，否则一旦委托(delegate)方法 didDiscoverPeripheral 返回，它就会被释放。
import UIKit
import CoreBluetooth
class ViewController: UIViewController, CBCentralManagerDelegate, CBPeripheralDelegate {
var manager: CBCentralManager!
var connectingPeripheral: CBPeripheral?
override func viewDidLoad() {
super.viewDidLoad()
manager = CBCentralManager (delegate: self, queue: nil)
}
func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {
print("Peripheral: \(peripheral)")
self.connectingPeripheral=peripheral
manager.connectPeripheral(peripheral, options:nil)
manager.stopScan()
}
...
}
关于swift - 外围设备未连接 - Swift，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35026093/