/** 自定义tabbar属性 */
- (void)customTabBarItemProperties {
    // 1.隐藏系统设置的分割线
    [tabBarController.tabBar setShadowImage:[UIImage new]];
    [tabBarController.tabBar setBackgroundImage:[UIImage new]];
    // 2.添加自定义的分割线
    UIImageView *ima = [[UIImageView alloc] initWithImage:[self imageFromColor:[UIColor redColor]]];
    ima.frame = CGRectMake(0,0,self.view.frame.size.width, 1.0f);
    tabBarController.tabBar.opaque = YES;
    [tabBarController.tabBar insertSubview:ima atIndex:0];
}
/** 根据颜色生成图片 */
+ (UIImage *)imageFromColor:(UIColor *)color{
    UIGraphicsBeginImageContext(0,0,self.view.frame.size.width, 1.0f);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}