NSArray *array1 = @[@1, @2, @3];
NSArray *array2 = @[@1, @2, @3];
// ARC任然具备Objective-c对象的所有权，不需手动释放
CFArrayRef arrayRef1 = (__bridge CFArrayRef)(array1);
NSLog(@"count = %ld", CFArrayGetCount(arrayRef1));
// __bridge_retained == __bridge_retained
// __bridge_retained意味着ARC交出对象所有权，要自己释放内存
CFArrayRef arrayRef2 = CFBridgingRetain(array1);
CFRelease(arrayRef2);
// CFArrayRef->NSArray
NSArray *array3 = (__bridge NSArray *)(arrayRef1);
