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我已经编写了一些 CoreBluetooth 代码，我可以发现这些设备，但我似乎无法发现我发现的外围设备的特征。有没有人有一个很好的示例代码可以用来验证我的代码？

这是我写的：

#import "ViewController.h"
@property(nonatomic, strong) CBCentralManager* centralmanager;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.centralmanager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
}

- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
    CBCentralManagerState currentState =  central.state;
    NSLog(@"state %i", currentState);

    switch (central.state)
    {
        case CBCentralManagerStatePoweredOn:
        {
            NSDictionary *options = @{
                                      CBCentralManagerScanOptionAllowDuplicatesKey: @YES
                                      };
            [self.centralmanager scanForPeripheralsWithServices:nil options:options];
            NSLog(@"I just started scanning for peripherals");
            break;
        }
    }
}
- (void)centralManager:(CBCentralManager *)central
  didConnectPeripheral:(CBPeripheral *)peripheral{
    NSLog(@"connected!");
}

- (void) centralManager:(CBCentralManager *)central
  didDiscoverPeripheral:(CBPeripheral *)peripheral
      advertisementData:(NSDictionary *)advertisementData
                   RSSI:(NSNumber *)RSSI
{
    [self.centralmanager connectPeripheral:peripheral options:nil];

    if ([[advertisementData description] containsString:@“keyword”]) {


         NSLog(@"peripheral count %lu", (unsigned long)[peripheral.services count]);
         [peripheral.services count];
       for (int i=0; [peripheral.services count]; i++) {
            for (CBService *s in peripheral.services) {
                [peripheral discoverCharacteristics:nil forService:s];
            }
        }
    }
}


- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{
    NSLog(@"did discover characteristic for service");
}

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSArray *)serviceUuids{
    NSLog(@"discovered a peripheral's services: %@", serviceUuids);
}
4

1 回答 1

5

看看这里： 示例代码

基本上流程是：

  1. 扫描设备
  2. 发现设备
  3. 连接到设备
  4. 向设备询问服务
  5. 向服务询问特征
  6. 写入、读取或通过特征获得通知

随后，您不必搜索和发现设备，因为以前发现的设备可以从缓存中检索并直接连接。

编辑： - - - - - - - - - -

阅读示例： [aPeripheral readValueForCharacteristic:aChar];

通知示例： [aPeripheral setNotifyValue:YES forCharacteristic:aChar];

- (void) peripheral:(CBPeripheral *)aPeripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error当 BLE 设备返回一个值时，这两个调用都会导致调用- 函数。使用通知时，每次设备更新其该特征的值时，都会自动调用此回调。

于 2015-09-14T20:54:19.103 回答