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You can do it with adding custom image, which will be created in your code, to selectionIndicatorImage in your Uitabbar object. For example, you can create extension for the Uiimage class like this:
extension UIImage {
func createSelectionIndicator(color: UIColor, size: CGSize, lineWidth: CGFloat) -> UIImage {
UIGraphicsBeginImageContextWithOptions(size, false, 0)
color.setFill()
UIRectFill(CGRectMake(0, size.height - lineWidth, size.width, lineWidth))
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
}
And call it your first loaded Viewcontroller, something like this.
class FirstViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let tabBar = self.tabBarController!.tabBar
tabBar.selectionIndicatorImage = UIImage().createSelectionIndicator(UIColor.blueColor(), size: CGSizeMake(tabBar.frame.width/CGFloat(tabBar.items!.count), tabBar.frame.height), lineWidth: 2.0)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
And the result will look like this.
Here explains very well... http://stackoverflow.com/questions/33667481/add-a-line-as-a-selection-indicator-to-a-uitabbaritem-in-swift
– JdsMedeirosBR