iOS - Getting desired shadow above UITabBar

Question

I am trying to get my tab bar shadow to look like the one seen in this image:

What is the best way of doing thi

Answer 1

Swift 4:

Use This Extension

extension UIImage {
class func colorForNavBar(color: UIColor) -> UIImage {
    //let rect = CGRectMake(0.0, 0.0, 1.0, 1.0)

    let rect = CGRect(origin: CGPoint(x: 0,y :0), size: CGSize(width: 1.0, height: 1.0))

    UIGraphicsBeginImageContext(rect.size)
    let context = UIGraphicsGetCurrentContext()

    context!.setFillColor(color.cgColor)
    context!.fill(rect)

    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()


     return image!
    } 
}

Set Shadow Color Using RGB

//Set BackgroundColor
 UITabBar.appearance().backgroundImage = UIImage.colorForNavBar(color: .white)

//Set Shadow Color
 UITabBar.appearance().shadowImage = UIImage.colorForNavBar(color: UIColor.init(red: 120/255.0, green: 120/255.0, blue: 120/255.0, alpha: 1.0))