Change Navigation bar Background image on each navigation

Question

I am working on iPhone app. I have added Navigation bar Background image

With interface: -

@interface UINavigationBar (backgroundImageWithTitle)

And method: -

- (void)drawRect:(CGRect)rect

By this method Navigation bar background images is being set one time.

I want to call it from different .m files for assigning different images on bar.

How it can be implemented?

Thanks in advance.

Answer 1

CustomNavigation.h

    #import <Foundation/Foundation.h>


    @interface UINavigationBar (UINavigationBarCustomDraw){

    }

    @end

CustomNavigation.m

    @implementation UINavigationBar (UINavigationBarCustomDraw)

    - (void) drawRect:(CGRect)rect {

        [self setTintColor:[UIColor colorWithRed:0.5f
                                           green: 0.5f
                                            blue:0 
                                           alpha:1]];

        if ([self.topItem.title length] > 0) {


            if ([self.topItem.title isEqualToString:@"First"]) {

                [[UIImage imageNamed:@"First.png"] drawInRect:rect];

            }

            else if ([self.topItem.title isEqualToString:@"Second"]) {

                [[UIImage imageNamed:@"Second.png"] drawInRect:rect];                   

            }




            CGRect frame = CGRectMake(0, 0, 320, 44);
            UILabel *label = [[[UILabel alloc] initWithFrame:frame] autorelease];
            [label setBackgroundColor:[UIColor clearColor]];
            label.font = [UIFont boldSystemFontOfSize: 20.0];
            label.shadowColor = [UIColor colorWithWhite:0.0 alpha:1];
            label.textAlignment = UITextAlignmentCenter;
            label.textColor = [UIColor whiteColor];
            label.text = self.topItem.title;
            self.topItem.titleView = label;





        } 


        else {
            [[UIImage imageNamed:@"wood.png"] drawInRect:rect];
            self.topItem.titleView = [[[UIView alloc] init] autorelease];
        }



    }

    @end

if u want to First.png to set navigationBar background image in FirstViewController then

in ur FirstViewController.m

        -(void) viewWillAppear:(BOOL)animated{

        [super viewWillAppear:animated];



            self.title=@"First";
            [self.navigationController.navigationBar drawRect:CGRectMake(0, 0, 320, 480)];

    }

if u want to Second.png to set navigationBar background image in SecondViewController then

in ur SecondViewController.m

        -(void) viewWillAppear:(BOOL)animated{

        [super viewWillAppear:animated];



            self.title=@"Second";
            [self.navigationController.navigationBar drawRect:CGRectMake(0, 0, 320, 480)];

    }

Answer 2

On iOS 5 this will not work but the good news is that there is a simple way of doing this

[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"name"] forBarMetrics:UIBarMetricsDefault];

NOTE: This will only work on iOS 5 and above so make sure you check iOS version if you want to be backwards compatible.

Answer 3

Or other option so that code runs only incase of iOS 5

if([[UINavigationBar class] respondsToSelector:@selector(appearance)]) //iOS >=5.0
{
    [[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"navigationBar.png"] forBarMetrics:UIBarMetricsDefault];
    [[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"navBar-Landscape.png"] forBarMetrics:UIBarMetricsLandscapePhone];   

}

Answer 4

I have tried this

[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"name"] forBarMetrics:UIBarMetricsDefault];

It works fine for iOS 5.0 but got crashed in iOS 4.3 or below.

You have either set conditional i.e for

iOS 5

[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"name"] forBarMetrics:UIBarMetricsDefault];

else

[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"name"]];

but still there is issue that it shows line under image.

Or you can do in this way

self.navigationItem.hidesBackButton = YES; 
UINavigationBar *navBar = self.navigationController.navigationBar;

UIImage *image = [UIImage imageNamed:@"image.png"];
UIView *tempView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 45)];
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 45)];
imgView.image = image;
[tempView addSubview:imgView];
[navBar clearBackgroundImage];
[navBar addSubview:tempView];
[tempView release];

Answer 5

You can try in this way

if([[UINavigationBar class] respondsToSelector:@selector(appearance)]) //iOS >=5.0
{
    //[[UINavigationBar appearance] setFrame:CGRectMake(0, 0, 320, 40)];
    [[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"navigationBar.png"] forBarMetrics:UIBarMetricsDefault];
    [[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"navBar-Landscape.png"] forBarMetrics:UIBarMetricsLandscapePhone];   

    [[UINavigationBar appearance] setBarStyle:UIBarStyleBlack];
}

and in else case you can add previous code i.e setBackgroundImage ....

Answer 6

Using (SDK 3.2.5.) - In one of my Apps I needed navigationBar with custom image both in landscape and portrait.

What I did was:

@implementation UINavigationBar (BackgroundImage)

- (void)drawRect:(CGRect)rect 
{
    UIImage *image;

    if(self.frame.size.width == 320) //for iPhone - portrait will have 320 pix width.
    {
        image = [UIImage imageNamed: @"portraitNavigationBar.png"];
    }
    else
    {
        image = [UIImage imageNamed: @"landscapeNavigationBar.png"];
    }

    [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}

@end

Luckily my app supports rotation - so, when rotating - navigation bar automatically redraws itself.

But to manually redraw it - you can also call :

[navigationController.navigationBar setNeedsDisplay];