IOS开发 IOS7使导航栏透明

- (void)setNavBarAppearance:(BOOL)animated
{
    self.navigationController.navigationBar.backgroundColor = [UIColor clearColor];
    self.navigationController.navigationBar.tintColor = [UIColor clearColor];
    
    self.navigationController.navigationBar.barStyle = UIBarStyleBlackTranslucent;
    self.navigationController.navigationBar.translucent = YES;
    self.navigationController.navigationBar.opaque = NO;
    
    if ([[UINavigationBar class] respondsToSelector:@selector(appearance)]) {
        [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"bg_navigation_bar"] forBarMetrics:UIBarMetricsDefault];
    }
    
    if ([self.navigationController.navigationBar respondsToSelector:@selector(shadowImage)]) {
        [self.navigationController.navigationBar setShadowImage:[UIImage imageNamed:@"bg_navigation_bar"]];
    }
}