问iOS核心蓝牙CBCentralManager scanForPeripheralsWithServices无结果

EN

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

@interface ViewController : UIViewController <CBCentralManagerDelegate>

@property (strong, nonatomic) CBCentralManager *centralManager;

@end

#import "ViewController.h"

@interface ViewController ()
@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.centralManager = [[CBCentralManager alloc]initWithDelegate:self queue:nil];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


#pragma mark - CBCentralManager Delegate

- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
    if (self.centralManager.state == CBCentralManagerStatePoweredOn)
    {
        NSLog(@"is on");
        [self.centralManager scanForPeripheralsWithServices:nil options:nil];

    }
}


- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{   
    NSLog(@"Discovered %@", peripheral.name);

}