iOS：如何在UITabBarItem中添加下划线

问题描述

我正在申请工作，我需要在 UITabbarItem 中添加下划线。

I am working in a application where i need to add underline in UITabbarItem.

所以我想要在iOS的默认 UITabbarcontroller 中的所选 UITabbarItem 下添加下划线。

so i would like to add underline under the selected UITabbarItem in Default UITabbarcontroller of iOS.

我已经创建了 UITabbarcontroller 的子类，但没有找到任何方法来添加行。

I have already created subclass of UITabbarcontroller but didn't find any way to add line in that.

我想做类似下图的事情。

I want to do something like below image.

如果有人对此有任何想法，请在这里分享。

If anyone have any idea for this please share here.

推荐答案

请尝试这个。
我曾在我的应用程序中使用过一次，并希望它也能帮到你。

Please try this one.I have used in my application once and hope it will help you too.

这就是我以编程方式创建Tab栏的方式：

This is how I have created Tab bar programmatically:

      UITabBarController *tab = [[UITabBarController alloc]init];
      ViewController1 *v1 = [[ViewController1 alloc]init];
      ViewController1 *v2 = [[ViewController1 alloc]init];
      ViewController1 *v3 = [[ViewController1 alloc]init];
      ViewController1 *v4 = [[ViewController1 alloc]init];

      tab.viewControllers = [NSArray
arrayWithObjects:v1,v2,v3,v4,nil];

      [[tab.tabBar.items objectAtIndex:0]setImage:[UIImage imageNamed:@""]];
      [[tab.tabBar.items objectAtIndex:1]setImage:[UIImage imageNamed:@""]];
      [[tab.tabBar.items objectAtIndex:2]setImage:[UIImage imageNamed:@""]];
      [[tab.tabBar.items objectAtIndex:3]setImage:[UIImage imageNamed:@""]];
      int divide = 4;
      if([UIDevice currentDevice].userInterfaceIdiom ==UIUserInterfaceIdiomPad)
          divide =6;
      }
      UIView *view = [[UIView alloc]initWithFrame:CGRectMake(tab.tabBar.frame.origin.x,tab.tabBar.frame.origin.y, self.view.frame.size.width/divide, 56)];

      UIImageView *border = [[UIImageView alloc]initWithFrame:CGRectMake(view.frame.origin.x,view.frame.size.height-6, self.view.frame.size.width/divide, 6)];  
      border.backgroundColor = "your color";
      [view addSubview:border];
      [tab.tabBar setSelectionIndicatorImage:[self changeViewToImage:view]];

//This is the method that will draw the underline
-(UIImage ) changeViewToImage : (UIView ) viewForImage {
      UIGraphicsBeginImageContext(viewForImage.bounds.size);
      [viewForImage.layer   renderInContext:UIGraphicsGetCurrentContext()];
      UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
      UIGraphicsEndImageContext();
      return img;
}

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