How do I add resizing without IB - objective-c

Question

Since starting with iPhone app development (last 9 months) I have only used IB. I have a project to work on already built by another developer that I need to optimise for iPhone screen. No problem in IB, I know how to do that, in this project however the Nav bar is added using code only and is an image view. Could someone advise me how I go about resizing/positioning the nav bar when IB isnt used? Im trying to enhance this app for the iphone 5 screen.
#define BAR_FRAME CGRectMake(0,0,320.0f,43.0f)
#implementation ICNavbarView
#synthesize homeButton=__homeButton;
#synthesize prevButton=__prevButton;
#synthesize nextButton=__nextButton;
#synthesize delegate=__delegate;
- (id)initWithFrame:(CGRect)frame
{
LogCmd();
self = [super initWithFrame:BAR_FRAME];
if (self) {
self.backgroundColor = [UIColor clearColor];
self.alpha = 0.9f;
// Add Navigation bar background // <<<<<< navigation bar from ui image
UIImageView *bgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"BgNavBarNew"]];
[self addSubview:bgView];
// Add back button
__prevButton = [UIButton buttonWithType:UIButtonTypeCustom];
__prevButton.frame = CGRectMake(30.0f, 6.0f, 29.0f, 31.0f);
UIImage *prevButtonPressed = [UIImage imageNamed:#"BtnPrevPressed"];
[__prevButton setImage:[UIImage imageNamed:#"BtnPrev"] forState:UIControlStateNormal];
[__prevButton setImage:prevButtonPressed forState:UIControlStateSelected];
[__prevButton setImage:prevButtonPressed forState:UIControlStateHighlighted];
[__prevButton addTarget:self action:#selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:__prevButton];
// Add next button
__nextButton = [UIButton buttonWithType:UIButtonTypeCustom];
__nextButton.frame = CGRectMake(262.0f, 6.0f, 29.0f, 31.0f);
UIImage *nextButtonPressed = [UIImage imageNamed:#"BtnNextPressed"];
[__nextButton setImage:[UIImage imageNamed:#"BtnNext"] forState:UIControlStateNormal];
[__nextButton setImage:nextButtonPressed forState:UIControlStateSelected];
[__nextButton setImage:nextButtonPressed forState:UIControlStateHighlighted];
[__nextButton addTarget:self action:#selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:__nextButton];
// Add home button
__homeButton = [UIButton buttonWithType:UIButtonTypeCustom];
__homeButton.frame = CGRectMake(145.0f, 6.0f, 31.0f, 30.0f);
UIImage *homeButtonPressed = [UIImage imageNamed:#"BtnHomePressed"];
[__homeButton setImage:[UIImage imageNamed:#"BtnHome"] forState:UIControlStateNormal];
[__homeButton setImage:homeButtonPressed forState:UIControlStateSelected];
[__homeButton setImage:homeButtonPressed forState:UIControlStateHighlighted];
[__homeButton addTarget:self action:#selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:__homeButton];
}
return self;
}
- (id)init
{
return [self initWithFrame:CGRectZero];
}
#pragma mark - Button handlers
- (void)buttonPressed:(id)sender
{
if (sender == __prevButton) {
[self.delegate performSelector:#selector(navBarPrevButtonPressed)];
} else if (sender == __homeButton) {
[self.delegate performSelector:#selector(navBarHomeButtonPressed)];
} else {
[self.delegate performSelector:#selector(navBarNextButtonPressed)];
}
}
#end
So far I tried UIViewAutoresizingFlexibleHeight; like this
// Add Navigation bar background
UIImageView *bgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"BgNavBarNew"]];
[self addSubview:bgView];
//resize
bgView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
This seems to make no difference and the nav bar hasn't moved

Answer 1

I've used this before, but I used the setter function instead of using the property. I don't know if that would change anything or not, but try it this way:
[bgView setAutoresizingMask:(UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth)];
The parens are important, if you have multiple re-sizing options.