1

我正在使用核心蓝牙。我添加了在特性上写入/读取的功能。在此之前，我想检查特征是否可写。我为此目的使用了characteristic.properties，我的代码是：

    if (characteristic.properties==CBCharacteristicPropertyRead)
    {
        [peripheralDevice readValueForCharacteristic:characteristic];
    }
    else if(characteristic.properties==CBCharacteristicPropertyWrite)
    {
        [peripheralDevice setNotifyValue:YES forCharacteristic:characteristic];
    }
  NSLog(@"the property :%d",currentCharacteristic.properties );

这是文档中 Characteristic.properties 的枚举：

typedef NS_ENUM(NSInteger, CBCharacteristicProperties) {
    CBCharacteristicPropertyBroadcast                                               = 0x01,
    CBCharacteristicPropertyRead                                                    = 0x02,
    CBCharacteristicPropertyWriteWithoutResponse                                    = 0x04,
    CBCharacteristicPropertyWrite                                                   = 0x08,
    CBCharacteristicPropertyNotify                                                  = 0x10,
    CBCharacteristicPropertyIndicate                                                = 0x20,
    CBCharacteristicPropertyAuthenticatedSignedWrites                               = 0x40,
    CBCharacteristicPropertyExtendedProperties                                      = 0x80,
    CBCharacteristicPropertyNotifyEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0)     = 0x100,
    CBCharacteristicPropertyIndicateEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0)   = 0x200
};

它可以很好地从特征中读取值。但问题是在写入值时它不会进入第二个循环。我已经用可写属性设置了特性。我得到了我检查过的两个外围设备的 136 in print 语句。请提出一些解决方案来克服这个问题？

4

2 回答 2

2

通过使用 ANDing 操作解决了这个问题：

 if (characteristic.properties&CBCharacteristicPropertyRead!=0)
 {
      [peripheralDevice readValueForCharacteristic:characteristic];
 }
于 2013-06-03T05:09:22.277 回答
0

这是 Swift 3 的解决方案：

if characteristic.properties.contains(.write) {
    ...
}
于 2017-06-12T13:53:04.820 回答