去掉Tabbar上的黑线，自定义

项目中遇到把tabBar的黑线换成阴影的问题，搜集很多资料，解决办法如下：

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我用的是切图"tabbar_shadow.png"，已经上传

代码如下：

UIImage *tabImag = [UIImage imageNamed:@"tabbar_shadow.png"];

    UIImageView *imaview = [[UIImageView alloc]initWithFrame:CGRectMake(0, -10, ScreenWidth, 10)];

    //imaview.backgroundColor = [UIColor redColor];

    imaview.image = tabImag;

    self.tabBar.clipsToBounds = NO;

    [self.tabBar addSubview:imaview];

    self.tabBar.backgroundColor = [UIColor clearColor];

    [[UITabBar appearance] setShadowImage:tabImag];

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