关于NavigationBar背景图片和颜色的设置

第一种：直接在你的UIViewController中设置//颜色设置，采用RGB格式UIColor *bgcolor = [UIColorcolorWithRed:255.0f/255.0fgreen:0.0f/255.0fblue:0.0f/255.0f alpha:1.0f];self.navigationController.navigationBar.tintColor= bicolor;//设置navigationBar的背景图片UIImage *navBarImage = [UIImageimageNamed:@"banner1.jpg"];navigationbaritembackgroundView=[[UIImageViewalloc]initWithImage:navBarImage];[self.navigationController.navigationBarinsertSubview:navigationbaritembackgroundViewatIndex:1];//将背景图片设置在你想要的atIndex处[self.navigationController.navigationBaradduSubview:navigationbaritembackgroundView];//这条指令将会让背景图片出现在最顶层，如果你开始在navigationBar设置得有其它的ui控件的话，它们将会被覆盖隐藏掉；上面的图片是直接加进去的，无法调整图片的大小，那么你的图片最好先制作为适合你预期的效果样式第二种：扩展UINavigationBar这里我先给链接，http://wsqwsq000.iteye.com/blog/1145172这个我认为说得是最清楚的what?不知道怎么扩展，那么看下面选中UINavigationBar，然后命名你想要的名称添加完成后，出现两个文件后然在这个类中进行添加函数，后面的看那个链接

//CustomNavigationBar.h@interface UINavigationBar (UINavigationBarCategory)UIImageView *backgroundView;- (void)setBackgroundImage:(UIImage*)image;- (void)insertSubview:(UIView *)view atIndex:(NSInteger)index;@end//CustomNavigationBar.m@implementation UINavigationBar (UINavigationBarCategory)-(void)setBackgroundImage:(UIImage*)image{if(image == nil){[backgroundView removeFromSuperview];}else{backgroundView = [[UIImageView alloc] initWithImage:image];backgroundView.tag = 1;backgroundView.frame = CGRectMake(0.f, 0.f, self.frame.size.width, self.frame.size.height);backgroundView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;[self addSubview:backgroundView];[self sendSubviewToBack:backgroundView];[backgroundView release];}}//for other views- (void)insertSubview:(UIView *)view atIndex:(NSInteger)index{[super insertSubview:view atIndex:index];[self sendSubviewToBack:backgroundView];}@end//YourViewController.m- (void)viewWillAppear:(BOOL)animated{[super viewWillAppear:animated];[self.navigationController.navigationBarsetBackgroundImage:[UIImage imageNamed:@"navigation_bar_bg.png"]];}综合了网上其它一些方法，有些没测试出效果

#import <UIKit/UIKit.h>@interface UINavigationBar (CustomImage)- (void)setBackgroundImage:(UIImage*)image;@end

#import "UINavigationBar+CustomImage.h"UIImageView *backgroundView;@implementation UINavigationBar (CustomImage)- (void)setBackgroundImage:(UIImage*)image{if(image == nil){UIColor *bgcolor = [UIColor colorWithRed:46.0f/255.0f green:87.0f/255.0f blue:29.0f/255.0f alpha:1.0f];self.tintColor = bgcolor;[backgroundView removeFromSuperview];}else{backgroundView = [[UIImageView alloc] initWithImage:image];//backgroundView.tag = 1;backgroundView.frame = CGRectMake(0.f, 0.f, self.frame.size.width, self.frame.size.height);backgroundView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;[self insertSubview:backgroundView atIndex:1];//这条指令atIndex：1达到了预期的效果[backgroundView release];}}/*- (void)drawRect:(BOOL)color {//颜色填充if(color==YES ){UIColor *bgcolor = [UIColor colorWithRed:46.0f/255.0f green:87.0f/255.0f blue:29.0f/255.0f alpha:1.0f];self.tintColor = bgcolor;return;}UIImageView *backgroundView;UIImage *navBarImage = [UIImage imageNamed:@"banner1.jpg"];backgroundView = [[UIImageView alloc] initWithImage:navBarImage];[self insertSubview:backgroundView atIndex:1];//这条指令atIndex：1达到了预期的效果[backgroundView release];/*//第一种：颜色填充UIColor *color = [UIColor blueColor];CGContextRef context = UIGraphicsGetCurrentContext();CGContextSetFillColor(context, CGColorGetComponents( [color CGColor]));CGContextFillRect(context, rect);self.tintColor = color;*///第二种：图片填充/*UIImage *img	= [UIImage imageNamed: @"net.png"];[img drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];*//*第三种：UIImage *img = [UIImage imageNamed: @"net.png"];CGPoint point = {0,0};[img drawAtPoint:point];*///[self addSubview:backgroundView]; 这条指令addSubview：会让背景图显示在最前面，覆盖掉工程里的搜索按钮//[self sendSubviewToBack:backgroundView];这条指令加上在这个工程里背景图就无法显示了//第四种：加入旋转坐标系代码// Drawing code/*CGContextRef context = UIGraphicsGetCurrentContext();CGContextTranslateCTM(context, 0.0, self.frame.size.height);CGContextScaleCTM(context, 1.0, -1.0);CGPoint center=self.center;CGImageRef cgImage= CGImageCreateWithImageInRect(navBarImage.CGImage,CGRectMake(0, 0, 1, 44));CGContextDrawImage(context, CGRectMake(center.x-160-80, 0, 80,self.frame.size.height), cgImage);CGContextDrawImage(context, CGRectMake(center.x-160, 0, 320,self.frame.size.height), navBarImage.CGImage);CGContextDrawImage(context, CGRectMake(center.x+160, 0, 80,self.frame.size.height), cgImage);}*/@end