UINavigationBar自定义背景以及按钮

UINavigationBar自定义导航栏背景和按钮，完美支持横屏竖屏旋转，视图控制器可以分别使用自己的导航栏

此方法可以通过Apple审核，导航上的按钮背景需要做，否则看起来不那么和之又谐 . 此方法使用于ios5。0以下

//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.navigationBar
        setBackgroundImage:[UIImage imageNamed:@"navigation_bar_bg.png"]];

//判断设备的版本

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 50000

if ([self.navigationController.navigationBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)]){

//ios5 新特性

[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"titleBar.png"] forBarMetrics:UIBarMetricsDefault];

}

#endif

}