algorithm - LinkedList in Objective C will object be released? -

i making delete method in linked list in objective c. want delete node in list, however, in delete code, set "head" element's "next" node deleted's "next". cause node deleted not freed memory? if so, how fix?

the list node follows

@interface listnode : nsobject @property (nonatomic, assign) int data; @property (nonatomic, strong) listnode* next; @end 

the code delete below.

-(bool)deleteelementwithhead:(listnode*)headnode andnodetodelete:(listnode*)deletenode{      if (!head || !deletenode) {         return false;     }     listnode *element = head;      if (deletenode == head) {         listnode *temp;     temp = element.next;     head = nil;     head = temp;     return true;     }      while (element) {         if (element.next == deletenode) {             element.next = deletenode.next;//set pointer element node delete's "next" property points next 1 in list             deletenode = nil;             return true;         }         element = element.next;     }      return false; }