Change Navigation bar Background image on each navigation - iphone

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];