iOS 从未调用过蓝牙 peripheralManagerDidUpdateState

Question

我正在尝试将我的 iPhone 设置为充当心率监测器并使用标准心率服务发送信息，以便我电脑上的运行应用程序可以检索数据。我是 iOS 的新手，但我之前在 Android 和 Windows 上安装过蓝牙设备运行。我正在关注信息here，我在第一个障碍中倒下了...

按照文档中的说明，我首先调用

CBPeripheralManager *myPeripheralManager = [[CBPeripheralManager alloc] initWithDelegate:(id<CBPeripheralManagerDelegate>)self queue:nil options:nil];

我也实现了 peripheralManagerDidUpdateState 回调，但问题就出在这里。这个回调永远不会运行！我等了几分钟，什么也没发生。我怀疑我错过了一个非常简单的步骤，因为我搜索了一整天但在网上找不到任何东西！任何人都可以解释在代码中和使用我的 iPhone 实际执行操作时要采取的明确步骤吗？在此回调运行之前是否必须有连接？它必须与任何东西配对吗？

这是完整的代码。一切正常，我一点错误都没有。

#import "ViewController.h"
@import CoreBluetooth;

@interface ViewController()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    NSLog(@"App running...");

    //Create the peripheral manager
    CBPeripheralManager *myPeripheralManager = [[CBPeripheralManager alloc] initWithDelegate:(id<CBPeripheralManagerDelegate>)self queue:nil options:nil];
}

- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral{
    int state = peripheral.state;
    NSLog(@"Peripheral manager state =  %d", state);

    //Set the UUIDs for service and characteristic
    CBUUID *heartRateServiceUUID = [CBUUID UUIDWithString: @"180D"];
    CBUUID *heartRateCharacteristicUUID = [CBUUID UUIDWithString:@"2A37"];
    CBUUID *heartRateSensorLocationCharacteristicUUID = [CBUUID UUIDWithString:@"0x2A38"];


    //char heartRateData[2]; heartRateData[0] = 0; heartRateData[1] = 60;

    //Create the characteristics
    CBMutableCharacteristic *heartRateCharacteristic =
    [[CBMutableCharacteristic alloc] initWithType:heartRateCharacteristicUUID
                                       properties: CBCharacteristicPropertyNotify
                                            value:nil
                                      permissions:CBAttributePermissionsReadable];

    CBMutableCharacteristic *heartRateSensorLocationCharacteristic =
    [[CBMutableCharacteristic alloc] initWithType:heartRateSensorLocationCharacteristicUUID
                                       properties:CBCharacteristicPropertyRead
                                            value:nil
                                      permissions:CBAttributePermissionsReadable];
    //Create the service
    CBMutableService *myService = [[CBMutableService alloc] initWithType:heartRateServiceUUID primary:YES];
    myService.characteristics = @[heartRateCharacteristic, heartRateSensorLocationCharacteristic];

    //Publish the service
    NSLog(@"Attempting to publish service...");
    [peripheral addService:myService];

    //Set the data
    NSDictionary *data = @{CBAdvertisementDataLocalNameKey:@"iDeviceName",
                           CBAdvertisementDataServiceUUIDsKey:@[[CBUUID UUIDWithString:@"180D"]]};

    //Advertise the service
    NSLog(@"Attempting to advertise service...");
    [peripheral startAdvertising:data];

}

- (void)peripheralManager:(CBPeripheralManager *)peripheral
            didAddService:(CBService *)service
                    error:(NSError *)error {

    if (error) {
        NSLog(@"Error publishing service: %@", [error localizedDescription]);
    }
    else NSLog(@"Service successfully published");
}

- (void)peripheralManagerDidStartAdvertising:(CBPeripheralManager *)peripheral
                                       error:(NSError *)error {

    if (error) {
        NSLog(@"Error advertising: %@", [error localizedDescription]);
    }
    else NSLog(@"Service successfully advertising");
}

@end

Answer 1

对象 myPeripheralManager 在 viewDidLoad 方法 returns 后立即被释放，因为您只有一个指向该对象的引用并且它超出了范围。

解决方案是在 ViewController 中创建一个属性，它引用 CBPeripheralManager 的实例：

@interface ViewController()
@property (nonatomic, strong) CBPeripheralManager *myPeripheralManager;
@end

然后在viewDidLoad中初始化属性:

self.myPeripheralManager = myPeripheralManager = [[CBPeripheralManager alloc] initWithDelegate:(id<CBPeripheralManagerDelegate>)self queue:nil options:nil];

您可能想在 Objective-C 中阅读有关内存管理（尤其是自动引用计数）的更多信息。

Answer 2

我的解决方案是：

import UIKit
import CoreBluetooth

class BluetoothManager: NSObject, CBPeripheralManagerDelegate {

    static let sharedInstance = BluetoothManager()

    var bluetoothPeripheralManager: CBPeripheralManager?


    override fileprivate init() {
    }

    func start() {
        bluetoothPeripheralManager = CBPeripheralManager(delegate: self, queue: nil, options: nil)

    }

    // MARK - CBCentralManagerDelegate
    func peripheralManagerDidUpdateState(_ peripheral: CBPeripheralManager) {

        var statusMessage = ""

        switch peripheral.state {
        case .poweredOn:
            statusMessage = "Bluetooth Status: Turned On"

        case .poweredOff:
            statusMessage = "Bluetooth Status: Turned Off"

        case .resetting:
            statusMessage = "Bluetooth Status: Resetting"

        case .unauthorized:
            statusMessage = "Bluetooth Status: Not Authorized"

        case .unsupported:
            statusMessage = "Bluetooth Status: Not Supported"

        default:
            statusMessage = "Bluetooth Status: Unknown"
        }

        print(statusMessage)

        if peripheral.state == .poweredOff {
            //TODO: Update this property in an App Manager class
        }
    }}

用法：

BluetoothManager.sharedInstance.start()

启动您的 turn/off 和蓝牙应该会出现一条日志消息，指示蓝牙状态。

iOS 从未调用过蓝牙 peripheralManagerDidUpdateState

iOS Bluetooth peripheralManagerDidUpdateState never called

bluetooth

objective-c

ios

core-bluetooth

cbperipheralmanager