_ Bridge _ bridge_retained _ bridge_transfer, bridgetransfer

_ Bridge _ bridge_retained _ bridge_transfer, bridgetransfer

_ Bridge only performs type conversion, but does not modify the object (memory) management right;

_ Bridge_retained (you can also use CFBridgingRetain) to convert an Objective-C object to a Core Foundation object, and assign the object (memory) management right to us, CFRelease or related methods will be used to release objects in the future;

_ Bridge_transfer (CFBridgingRelease can also be used) converts the Core Foundation object to an Objective-C object, and grants the object (memory) Management Right to ARC.