How to get a UIBarButtonSystemItem on a UIToolBar to take me to another view

Accept my early apologies as totally new to this so my terminology may not be accurate, hope you can understand what it is that i'm asking.

I am having issues getting a UIBarButtonSystemItem to take me back to a different view when p开发者_如何学Pythonushed. I have defined a UIToolBar with a UIBarButtonSystemItem on it which compiles and works perfectly. However, when the button is pushed the app crashes.

This is the code i have used to define the UIToolBar and UIButton:

//create toolbar using new
toolbar = [UIToolbar new];
toolbar.barStyle = UIBarStyleBlackTranslucent;
[toolbar sizeToFit];
toolbar.frame = CGRectMake(0, 410, 320, 50);

//Add buttons
UIBarButtonItem *systemItem1 = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemAction
                     target:self
                     action:@selector(pressButton1:)];

I have then added flexitem to this and added the button to the array using the following code:

//Use this to put space in between your toolbox buttons
UIBarButtonItem *flexItem = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
                     target:nil
                     action:nil];

//Add buttons to the array
NSArray *items = [NSArray arrayWithObjects: systemItem1, flexItem, nil];

This is where I fall down and I have attempted to get the button to take me to a previous view when pushed by using the following code:

-(void)pressButton1:(id)sender {
    BMR_TDEE_CalculatorViewController *controller1 = [[BMR_TDEE_CalculatorViewController alloc] initWithNibName:@"BMR_TDEE_ViewController" bundle:nil];

    controller1.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self presentModalViewController:controller1 animated:YES];
    [controller1 release];
}

Like I said, this just crashes my simulator. It compiles without issue but Im guessing the code is fundamentally wrong as i am new to this. Any help explained dumbed down would be fantastic ;-)

Thanks All

This:

UIBarButtonItem *systemItem1 = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(pressButton1:)

should be:

UIButton *button=[[UIButton alloc] init];
button.frame=CGRectMake(0, 0, 65, 32);
[button addTarget:self action:@selector(pressButton1:) forControlEvents:UIControlEventTouchUpInside];

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];

For the (void)pressbutton code it should now be:

-(IBAction)pressButton1:(id)sender {
    BMR_TDEE_CalculatorViewController *controller = [[BMR_TDEE_CalculatorViewController alloc] initWithNibName:@"BMR_TDEE_CalculatorViewController" bundle:nil];
    [self.navigationController presentModalViewController:controller animated:TRUE];
}