Is there a way to add an image in the background of UINavigationBar. There is no direct option through interface builder but I have seen apps implemented this thing.
Any help would be appreciated.
Thanks
Create a UIView and add it as a subview.
Edit: You can now use setBackgroundImage:forBarMetrics:. Source: https://stackoverflow.com/a/7765102/313875
Use this code
UIImage *backgroundImage = [UIImage imageNamed:#"strip.png"];
[upnavbar setBackgroundImage:backgroundImage forBarMetrics:UIBarMetricsDefault];
this wil work.
Just add your background as a subview, as jrtc27 suggested and change the tint color according your needs.
You can also override the drawLayer:inContext: method in a UINavigationBar category class. Inside the drawLayer:inContext: method, you can draw the background image you want to use. You can also use different sized images for portrait and landscape orientations if you'd like to.
- (void) drawLayer:(CALayer *)layer inContext:(CGContextRef)context
{
if ([self isMemberOfClass:[UINavigationBar class]] == NO) {
return;
}
UIImage *image = (self.frame.size.width > 320) ?
[UINavigationBar bgImageLandscape] : [UINavigationBar bgImagePortrait];
CGContextClip(context);
CGContextTranslateCTM(context, 0, image.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGContextDrawImage(context, CGRectMake(0, 0, self.frame.size.width, self.frame.size.height), image.CGImage);
}
And as a complete demo Xcode project on customizing the appearance of UINavigationBar this and this might be helpful.
I recently wrote an article about customization of background for UINavigatioBar and UIToolbar. You can find a code sample and categories for seamless integration of this functionality in your app by following link — http://leonov.co/2011/04/uinavigationbar-and-uitoolbar-customization-ultimate-solution/
You can also override the drawRect function.
#implementation UINavigationBar (UINavigationBarCustom)
- (void)drawRect:(CGRect)rect {
UIImage *image = [UIImage imageNamed:#"nav_bar_logo.png"];
[image drawInRect:rect];
}
#end
Related
I'm trying to figure out how to add a custom background image to NavigationBar buttons that use system icons, or image icons.
I've figured out how to add a background image to NavigationBar buttons with text, but I'm struggling to figure out how to accomplish this with icon buttons.
For the text buttons I followed this tutorial:
http://idevrecipes.com/2010/12/13/wooduinavigation/
How can I create custom buttons w/ icons?
Thanks!
u might get help with this
#implementation UINavigationBar (UINavigationBarCategory)
-(void)setBackgroundImage:(UIImage*)image{
if(!image) return;
UIImageView *aTabBarBackground = [[UIImageView alloc]initWithImage:image];
// aTabBarBackground.frame = CGRectMake(0,0,self.frame.size.width,self.frame.size.height);
aTabBarBackground.frame = CGRectMake(0,0,self.frame.size.width * .6,self.frame.size.height);
// [self addSubview:aTabBarBackground];
// [self sendSubviewToBack:aTabBarBackground];
[self insertSubview: aTabBarBackground atIndex: 0];
[aTabBarBackground release];
}
#end
it works fine for me
also we hav another idea.
#implementation UINavigationBar (UINavigationBarCategory)
- (void)drawRect:(CGRect)rect {
// Drawing code
UIImage *img = [UIImage imageNamed: #"navbar_background.png"];
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextDrawImage(context, CGRectMake(0, 0, 320, self.frame.size.height), img.CGImage);
}
#end
I'd like to change the background of my UINavigationBar to a [UIColor colorWithImage:], but it isn't working. What am I missing?
EDIT:
Once I've created my subclass, where do I set the UINavigationController to use it?
You can use the tintColor property to change the colour of a UINavigationBar, but to set an image as the background you'll have to provide your own UINavigationBar subclass and override the drawRect: method, for example:
- (void)drawRect:(CGRect)rect {
// Drawing code
UIImage *img = [UIImage imageNamed: #"background-image.png"];
[img drawInRect:CGRectMake(0,
0,
self.frame.size.width,
self.frame.size.height)];
}
If you use Interface Builder to build your UI then to use the custom navigation bar, just select the UINavigationBar element in Interface Builder, open the Inspector and in the Identity tab specify your UINavigationBar subclass in the class field, like so:
To have an image in the navigation bar, you have to draw it yourself, which actually isn't that hard. Save this as UINavigationBar+CustomBackground.m (it adds a custom category to UINavigationBar):
#implementation UINavigationBar (CustomBackground)
- (void)drawRect:(CGRect)rect {
UIImage *image = [UIImage imageNamed:#"NavMain.png"];
[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}
#end
I use the following UITTabBar and UINavigationBar built-in code to place my own custom image on the background of Tabbar and Navigation bar. It works great in my iPhone 3.0 application. Now, i am trying to convert my iPhone 3.0 application to iOS4.0. I ran the same project in Xcode 3.2.3(for iOS 4.0) now but unable to view my custom Tabbar image in the background of Tabbar. I tried debugging it, but it is not calling to this function UITabbar at all, but the same time it calls UINavigationBar well and works. Is this function(UITabbar) not there (or) can't use in iOS 4.0?
#implementation UITabBar(CustomImage)
- (void)drawRect:(CGRect)rect {
UIImage *image = [UIImage imageNamed: #"Tabbar.png"];
[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}
#end
#implementation UINavigationBar (UINavigationBarCategory)
- (void)drawRect:(CGRect)rect {
UIImage *image = [UIImage imageNamed: #"NavigationImage.png"];
[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}
#end
Please advise.
Thank you.
I have resolved it by adding the code below:
[self.tabBarController.tabBar insertSubview:[ [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"Tabbar.png"]] autorelease] atIndex:0];
I have been trying to figure out how to display a background image behind a UINavigationBar on my iPhone app and have come across the same solution many times which is as follows:
#implementation UINavigationBar (UINavigationBarCategory) {
- (void)drawRect:(CGRect)rect {
UIImage *img = [UIImage imageNamed: #"logo_bar.png"];
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextDrawImage(context, CGRectMake(0, 0, 317, 27), img.CGImage);
}
#end
Which works to a degree
My image is upside down and backwards!! why on earth would that be? I have checked the image itself which is fine. Where would this transform be getting applied??
I also have further questions, like:
How can I choose to show the BG image or perhaps toggle its alpha on selected screens? There is one particular screen where there is a back button and it covers the image, which I dont want, I would rather just not display the image on that screen.
The image is not the entire height of the UINavigationBar its just a small slice of it (27 as you can see). How can I keep the tint color for the rest of the bar using this technique?
Thanks, I have not used Categories before which may be key to me understanding this, but perhaps not...
// Drawing code
CGContextRef c = UIGraphicsGetCurrentContext();
UIImage *back=[UIImage imageNamed:#"bar.png"];
CGContextScaleCTM(c,1,-1);
CGContextTranslateCTM(c,0,-44);
CGContextDrawImage(c,CGRectMake(0, 0, 320, 44),[back CGImage]);
This is how I draw my custom navigation bar. Hope that helps.
You can also do it in the drawLayer:inContext: method in a UINavigationBar category class. Inside the drawLayer:inContext: method, you can draw the background image you want to use. This code also supports both portrait and landscape orientations.
- (void) drawLayer:(CALayer *)layer inContext:(CGContextRef)context
{
if ([self isMemberOfClass:[UINavigationBar class]] == NO) {
return;
}
UIImage *image = (self.frame.size.width > 320) ?
[UINavigationBar bgImageLandscape] : [UINavigationBar bgImagePortrait];
CGContextClip(context);
CGContextTranslateCTM(context, 0, image.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGContextDrawImage(context, CGRectMake(0, 0, self.frame.size.width, self.frame.size.height), image.CGImage);
}
And this complete demo Xcode project on customizing the appearance of UINavigationBar might be helpful.
I am adding a custom background for my UINavigationBar. It works fine as long as the phone is in portrait mode. As soon as I switch to landscape mode, half the bar appears blue (the default navbar color) and half of it has my image
How can I stretch the image for landscape mode and make it small again for portrait mode?
Thanks
Solution
Incase anyone is looking for an answer to how to add an image to navigation bar - here goes
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, 480.0, 44.0)];
[imgView setImage:[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"navbar_landscape" ofType:#"png"]]];
[navigationController.navigationBar addSubview:imgView];
[imgView release];
In both screen orientation modes it's much better to use
[navigationController.navigationBar insertSubview:imgView atIndex:0];
This puts image view under all other views and all the default navigation bar elements (title, standard buttons) work OK.
After a bit of research and trail and error, I found a work around, that will not replace the navbar when you enter the movie playback mode. Hopeefully this does not cause problems with app approval, but based on this post, I think it should be fine:
http://developer.apple.com/iphone/library/qa/qa2009/qa1637.html
#implementation UINavigationBar (UINavigationBarCategory)
- (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx
{
if([self isMemberOfClass: [UINavigationBar class]]){
UIImage *image = [UIImage imageNamed:#"navBarBackground.png"];
CGContextClip(ctx);
CGContextTranslateCTM(ctx, 0, image.size.height);
CGContextScaleCTM(ctx, 1.0, -1.0);
CGContextDrawImage(ctx, CGRectMake(0, 0, self.frame.size.width, self.frame.size.height), image.CGImage);
}else{
[super drawLayer:layer inContext:ctx];
}
}
#end
You probably need to set the autoresizingMask of your background image view; try using UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight
The solution Ben gave did solve the problem but it stretches the image in landscape mode. I ended up creating two images- one for landscape and other for the portrait mode. I then added code in shouldAutoRotate to change the navbar image based on the orientation
You can change the image for both portrait and landscape orientations by supplying different images for different orientations by checking the frame size of that UINavigation bar instance:
- (void) drawLayer:(CALayer *)layer inContext:(CGContextRef)context
{
if ([self isMemberOfClass:[UINavigationBar class]] == NO) {
return;
}
UIImage *image = (self.frame.size.width > 320) ?
[UINavigationBar bgImageLandscape] : [UINavigationBar bgImagePortrait];
CGContextClip(context);
CGContextTranslateCTM(context, 0, image.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGContextDrawImage(context, CGRectMake(0, 0, self.frame.size.width, self.frame.size.height), image.CGImage);
}
And this complete demo Xcode project on customizing the appearance of UINavigationBar might be helpful. It also includes #2x versions of background images to support retina displays on iPhone 4 devices.
Try the simpler method of [UIImage imageNamed:#"navbar_landscape.png"] since a UI element is exactly what imageNamed: is intended for, as ljonesATL shows.