4.3和5。0兼容 重写的一些方法 navigationbar

。h文件

#import <UIKit/UIKit.h>

@interface UINavigationBar (setBackgroundColor)

- (void) setBackgroundColor:(UIImage *)backgroundImage;

@end

。m文件

#import "UINavigationBar+setBackgroundColor.h"

UIImage *newimage;

@implementation UINavigationBar (setBackgroundColor)

- (void) drawRect:(CGRect)rect {

UIImage *image = newimage;

[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];

}

- (void) setBackgroundColor:(UIImage *)backgroundImage  {

    if ([UINavigationBar instancesRespondToSelector:

         @selector(setBackgroundImage:forBarMetrics:)]) {

        UIImage *image = backgroundImage;

        [self setBackgroundImage:image forBarMetrics:UIBarMetricsDefault];

    }else{

        newimage=backgroundImage;

        [self setNeedsDisplay];

    }

}

@end