如何为 UITabBar 项目之一添加左右边框?

How can I add left and right borders for one of the UITabBar items?

如果您查看下图,您会看到两条竖线 -- 分隔中间的选项卡项。 (线条模糊)

在代码中,如何创建这两行?

您可以:
1. 在 .png
中添加带有线条的选定图像 2. 设置带线条的背景图像并根据所选选项卡更改此图像。
3. 创建自己的视图,继承自 UIView 并将其添加为子视图(在这种情况下,您必须实现自己的切换逻辑)

 This will help you to add the seperators
//Add seperators Line
        if let items = self.tabBar.items {
            //Get the height of the tab bar
            let height = self.tabBar.bounds.height
            let width = self.tabBar.bounds.width

//Calculate the size of the items
            let numItems = CGFloat(items.count)
            let itemSize = CGSize(
                width: tabBar.frame.width / numItems,
                height: tabBar.frame.height)

            for (index, _) in items.enumerated() {
                //We don't want a separator on the left of the first item.
                if index > 0 {

//Xposition of the item
                    let xPosition = itemSize.width * CGFloat(index)

                    let separator = UIView(frame: CGRect(
                        x: xPosition, y: 0, width: 3.5, height: height))
                    separator.backgroundColor = UIColor.white
                    tabBar.insertSubview(separator, at: 1)
               }
           }

扩展 UIImage {

class func imageWithColor(color: UIColor, size: CGSize) -> UIImage {
    let rect: CGRect = CGRectMake(0, 0, size.width, size.height)
    UIGraphicsBeginImageContextWithOptions(size, false, 0)
    color.setFill()
    UIRectFill(rect)
    let image: UIImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image
}

}