更改navigationBar 颜色





    if (IS_IOS7()) {
        /*  iOS7 时 Navigation 颜色    */
        [[UINavigationBar appearance] setBarTintColor: HexColor(0x7bae01)];
    } else {
        /*  iOS 6 更改Navitgation  */
        self.navigationBar.tintColor = HexColor(0x7bae01);
        /*  iOS 6 保持StatusBar颜色为黑色  */
        [[UIApplication sharedApplication]setStatusBarStyle:UIStatusBarStyleBlackOpaque animated:YES];
//        self.navigationBar.translucent = YES;     //  半透明navigationBar
        self.wantsFullScreenLayout = YES;       //  状态栏高度不计算在视图内.隐藏状态时不会出现20px的白条.
    }