问题
I'm creating a new CBMutableCharacteristic for use in a Bluetooth app I'm making. I got some code from a tutorial, which looks like this:
_customCharacteristic = [[CBMutableCharacteristic alloc] initWithType:characteristicUUID properties:CBCharacteristicPropertyNotify value:nil permissions:CBAttributePermissionsReadable];
where _customCharacteristic is my CBMutableCharacteristic.
However, I want to initialize my _customCharacteristic with other properties, such as CBCharacteristicPropertyRead and CBCharacteristicPropertyWrite. The same is true for the permissions: I want to also give it CBAttributePermissionsWriteable.
According to this: http://developer.apple.com/library/ios/#documentation/CoreBluetooth/Reference/CBCharacteristic_Class/translated_content/CBCharacteristic.html#//apple_ref/doc/c_ref/CBCharacteristicProperties
and this: http://developer.apple.com/library/ios/#documentation/CoreBluetooth/Reference/CBMutableCharacteristic_Class/Reference/CBMutableCharacteristic.html#//apple_ref/doc/c_ref/CBAttributePermissions
I can have both multiple properties and permissions for each characteristic. However, I don't know how to initialize my CBMutableCharacteristic in this way.
回答1:
Its an enum, whose different values can be ORed bitwisely, so you can use the characteristic properties and permissions together:
CBMutableCharacteristic *_customCharacteristic = [[CBMutableCharacteristic alloc] initWithType:characteristicUUID properties:CBCharacteristicPropertyNotify+CBCharacteristicPropertyRead
value:nil permissions:CBAttributePermissionsReadable|CBAttributePermissionsWriteable];
回答2:
tdevoy answer is right one , Or following is also working code for me
characteristic = [[CBMutableCharacteristic alloc] initWithType:characteristicUUID properties:CBCharacteristicPropertyWriteWithoutResponse|CBCharacteristicPropertyRead value:nil permissions:CBAttributePermissionsReadable|CBAttributePermissionsWriteable];
来源：https://stackoverflow.com/questions/18114121/how-to-initialize-a-cbmutablecharacteristic-with-multiple-cbcharacteristicproper