Address of property expression requested

Question

i am passing my UINavigationController by reference to another class . but it is showing an error Address of property expression requested .

MyUtil *util =[[MyUtil alloc] init];

[util NavAndBackBtn:&self.navigationController];// giving error here..

MyUtil.m

-(void)NavAndBackBtn:(UINavigationController **)nav // ** for passing by reference
{

 UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

[btn setImage:[UIImage imageNamed:@"icon_back.png"] forState:UIControlStateNormal];

[button setFrame:CGRectMake(0,0,36,20);

UIBarButtonItem *barbtn = [[UIBarButton alloc] initWithCustomView:btn];

//*nav.navigationController.navigationItem.leftBarButtonItem = barbtn;// this gives error
//then i set this nav to Util nav

self.main_nav_ofUtilClass = *nav;

sefl.main_nav_ofUtilClass.navigationItem.leftBarButtonItem =barbtn;
}

Problem

how can i pass UINavigationController by reference . so that whatever changing i did to UINavigationController in another class happens to it.

I simply want to add a back button image to UINavigationController in another class name MyUtil

Answer 1

I think you have made mistake in method name

-(void)NavAndBackBtn:(UINavigationController **)nav

use insted of this

-(void)NavAndBackBtn:(UINavigationController *)nav

Remove **