self.navigationController is null

Question

in my viewcontroller,I have a button,when press the button,entry the navigationController,my code like:

-(IBAction)ShangHaiButtonPressed:(id)sender{
    mark         


        

Answer 1

This code will yield the solution you're looking for:

-(IBAction)ShangHaiButtonPressed:(id)sender {
     UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:self];
     [self.view removeFromSuperview];
     [appDelegate.window addSubview:nav.view];   // appDelegate is the delegate of your Application
     marketViewController = [[MarketViewController alloc] initWithNibName:@"MarketViewController" bundle:nil];
     [nav pushViewController:marketViewController animated:YES];
     [marketViewController release];    
}