change background color of navigation item (bar)

问题:

is there an easy way to change the background color of the navigation item on top of a view? I have a navigation based app and I only want that one view gets another background color. I created the views mainly with IB. I found the following solution (not tested):

float r=10;
float g=55;
float b=130;
float a=0;

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 120, 30)];
[label setBackgroundColor:[UIColor colorWithRed:r/255.f
                                          green:g/255.f
                                           blue:b/255.f    
                                          alpha:a/255.f];];
[self.navigationController.navigationBar.topItem setTitleView:label];
[label release];

Is there an easier way like

[navigationController.navigationBar setBackgroundColor:blueColor]

Or can I do it with IB (but without having the same color in every view)?

Many thanks in advance!

Cheers

回答1:

You could use:

[navigationController.navigationBar setTintColor:[UIColor redColor]; //Red as an example.

This would tint the color of the Navigation Bar and all it's Buttons to a specific color, in this case red. This property can also be set in Interface Builder.

And if you wanted to customize it further, you can set the background of the UINavigationBar to an image by sub-classing it. Like so…

Header File.

#import <UIKit/UIKit.h>

@interface UINavigationBar (CustomImage)

@end

Implementaion File.

#import "CustomNavigationBar.h"

@implementation UINavigationBar (CustomImage)

- (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx

{
    if([self isMemberOfClass: [UINavigationBar class]]){
        UIImage *image = [UIImage imageNamed:@"bar.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

Then in Interface Builder set the class of you UINavigationBar to (in this case) CustomNavigationBar under the Identity Tab.

回答2:

Try this in Interface Builder on your UINavigationController.

回答3:

[[UINavigationBar appearance] setTintColor:[UIColor colorWithRed:107.0/256.0 green:145.0/256.0 blue:35.0/256.0 alpha:1.0]]; Will change the color of the navigation bar of whole app.

Just place it in Appdelegate's didFinishLauncing method.

回答4:

You can use navigationController.navigationBar.tintColor;

回答5:

@jerry

tint color is not supported to the RGB Coordinates