How to cancel network request with afnetworking

Question

Is there a way to cancel all network request (the request started by another method) before I do a network request with AFNetworking I tried like below but not work:

Answer 1

Both the other two answers are right. Don't Create new AFHTTPRequestOperationManager instance

        @interface OperateCustomerView () {

        AFHTTPRequestOperationManager *manager;// = [AFHTTPRequestOperationManager manager];
    }
- (void)viewDidLoad {
    [super viewDidLoad];
    manager = [AFHTTPRequestOperationManager manager];