iphone - 核心蓝牙内部的可写特性

Question

我正在使用核心蓝牙。我添加了写/读特性的功能。在此之前，我想检查该特性是否可写。为此，我使用了 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
};

它可以很好地读取特征值。但问题是在写入值时它不会进入第二个循环。我已将特性设置为可写属性。对于我检查过的两个外围设备，我都得到了 136 in print 语句。请提出一些解决方案来克服这个问题？

Answer 1

通过使用 ANDing 操作解决了这个问题:

 if (characteristic.properties&CBCharacteristicPropertyRead!=0)
 {
      [peripheralDevice readValueForCharacteristic:characteristic];
 }