Block多层嵌套导致对象不释放解决

@weakify(self);
 [self.customerViewModel loginCustomerLogicWithMobile:mobile
                                                Password:password
                                        NormalLoginBlock:^{
                                            @strongify(self);  

                                            if ([self.customerViewModel getResponseStatus] == ZSYResponseSuccess) {
                                                if (self.navigationController.presentingViewController != nil) {
                                                    [self.navigationController dismissViewControllerAnimated:YES completion:nil];
                                                } else {
                                                    [self.navigationController popViewControllerAnimated:YES];
                                                }
                                            } else{
                                                //设置手势密码失败、注册失败，停留在手势密码界面
                                                self.buttonNext.enabled = YES;
                                                [self.txtLoginPwd becomeFirstResponder];
                                            }  

                                        } ForgetGesturePasswordBlock:^{
        @strongify(self);
                                       __block ZSYCustomerLoginViewController *point = self;//对指针retain一次</strong></span>
                                            [CLLockVC showSettingLockVCInVC:self successBlock:^(CLLockVC *lockVC, NSString *pwd) {  

                                                //保存手势密码到服务器
                                                GesturePasswordBlock block = [point.customerViewModel saveGesturePasswordCallback];
                                                block(mobile, pwd);  

                                                //密码保存成功之后，退出手势密码界面
                                                [CLLockVC dismiss:.3f Completion:nil];
                                                point = nil;//对指针release一次，保持前后retainCount守恒
                                            }];  

                                        } CreateGesturePasswordBlock:^{  

                                            [CLLockVC showSettingLockVCInVC:self successBlock:^(CLLockVC *lockVC, NSString *pwd) {
                                                @strongify(self);  

                                                //保存手势密码到服务器
                                                GesturePasswordBlock block = [self.customerViewModel saveGesturePasswordCallback];
                                                block(mobile, pwd);  

                                                //密码保存成功之后，退出手势密码界面
                                                [CLLockVC dismiss:.3f Completion:nil];
                                            }];
                                        }];