如何以编程方式扫描并连接到iOS上的Bluetooth A2DP设备

Question

我已经构建了一个Android APP，可以处理扫描，返回附近的设备以及在BLE和Bluetooth A2DP上连接步骤，并且运行良好。 现在，我正在开发功能完全相同的iOS版本。 对于BLE部分，我可以使用CoreBluetooth毫无问题地执行所需的操作，但是我不知道如何在iOS上为Bluetooth A2DP设备执行“扫描->返回附近可发现的设备->连接”的步骤。 到目前为止，我发现的唯一解决方案是从iOS APP导航到“设置”页面并在其上执行连接。 有什么方法可以在我的iOS APP内部以编程方式实现Bluetooth A2DP连接过程吗？

Answer 1

在iOS中，蓝牙适用于中央外围设备概念。 以下是它如何扫描附近的设备。

#import <UIKit/UIKit.h>
#import <CoreBluetooth/CoreBluetooth.h>


@interface MyViewController : UIViewController <CBPeripheralDelegate, CBCentralManagerDelegate>
{
    CBCentralManager *mgr;
}
@property (readwrite, nonatomic) CBCentralManager *mgr;
@end



- (void)viewDidLoad
{
    [super viewDidLoad];

    mgr = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
}


- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI {


    NSLog([NSString stringWithFormat:@"%@",[advertisementData description]]);
}

-(void)centralManager:(CBCentralManager *)central didRetrievePeripherals:(NSArray *)peripherals{
    NSLog(@"This is it!");
}


- (void)centralManagerDidUpdateState:(CBCentralManager *)central{ 
    NSString *messtoshow;

    switch (central.state) {
        case CBCentralManagerStateUnknown:
        {
            messtoshow=[NSString stringWithFormat:@"State unknown, update imminent."];
            break;
        }
        case CBCentralManagerStateResetting:
        {
            messtoshow=[NSString stringWithFormat:@"The connection with the system service was momentarily lost, update imminent."];
            break;
        }
        case CBCentralManagerStateUnsupported:
        {
            messtoshow=[NSString stringWithFormat:@"The platform doesn't support Bluetooth Low Energy"];
            break;
        }
        case CBCentralManagerStateUnauthorized:
        {
            messtoshow=[NSString stringWithFormat:@"The app is not authorized to use Bluetooth Low Energy"];
            break;
        }
        case CBCentralManagerStatePoweredOff:
        {
            messtoshow=[NSString stringWithFormat:@"Bluetooth is currently powered off."];
            break;
        }
        case CBCentralManagerStatePoweredOn:
        {
            messtoshow=[NSString stringWithFormat:@"Bluetooth is currently powered on and available to use."];
            [mgr scanForPeripheralsWithServices:nil options:nil];
            //[mgr retrieveConnectedPeripherals];

//--- it works, I Do get in this area!

            break;
        }   

    }
    NSLog(messtoshow); 
}