从不调用BLE - didDiscoverServices

Question

我已经看到了这种性质的一些问题，但似乎没有一个问题可以解决我的情况。我试图连接到BLE设备。一切顺利，直到我进入回调

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error

似乎从未调用过。这就是我所拥有的：

- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
    self.connected = [NSString stringWithFormat:@"Connected: %@", peripheral.state == CBPeripheralStateConnected ? @"YES" : @"NO"];
    NSLog(@"%@", self.connected);

    [peripheral setDelegate:self];

    if (peripheral.services) {
        [self peripheral:peripheral didDiscoverServices:nil]; //already discovered services, DO NOT re-discover. Just pass along the peripheral.
    } else {
        [peripheral discoverServices:nil]; //yet to discover, normal path. Discover your services needed
    }
}

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
{
    NSLog(@"here");

    for(CBService* svc in peripheral.services)
    {
        if(svc.characteristics)
            [self peripheral:peripheral didDiscoverCharacteristicsForService:svc error:nil]; //already discovered characteristic before, DO NOT do it again
        else
            [peripheral discoverCharacteristics:nil
                                     forService:svc]; //need to discover characteristics

        NSString *string = [NSString stringWithFormat:@"Discovered service: %@", svc.UUID];
        NSLog(@"%@", string);
        [self appendTextToDeviceInfo:string];
    }

}

我可以看到日志输出：

  

已连接：是

但就是这样。似乎没有调用didDiscoverServices回调中的任何内容。我已删除并重新安装了该应用，并重新启动了该设备。

任何人都能看到我做错了什么？谢谢！

修改
这是头文件：

#import <UIKit/UIKit.h>
@import CoreBluetooth;
@import QuartzCore;

@interface ViewController : UIViewController <CBCentralManagerDelegate, CBPeripheralDelegate>

@property (nonatomic, strong) CBCentralManager *centralManager;
@property (nonatomic, strong) CBPeripheral *myPeripheral;

@end

编辑＃2

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

    NSString *localName = [advertisementData objectForKey:CBAdvertisementDataLocalNameKey];
    if ([localName length] > 0) {

        NSLog(@"Found the device: %@", localName);

        [_centralManager cancelPeripheralConnection:peripheral]; //IMPORTANT, to clear off any pending connections
        [_centralManager stopScan];
        _myPeripheral = peripheral;
        _myPeripheral.delegate = self;
        [_centralManager connectPeripheral:_myPeripheral options:nil];
    }
}