阴影图像在第一个视图上不起作用

Question

I am trying to implement a seperatorline between the navigationbar and the content. I found a UIImage extension, which creates an image with a color.

    extension UIImage {
    class func imageWithColor(color: UIColor) -> UIImage {
        let rect = CGRect(x: 0.0, y: 0.0, width: 1.0, height: 0.5)
        UIGraphicsBeginImageContextWithOptions(rect.size, false, 0.0)
        color.setFill()
        UIRectFill(rect)
        let image : UIImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()
        return image
    }
}

I put this in the viewWillAppear like that:

navigationController?.navigationBar.shadowImage = UIImage.imageWithColor(color: constants.lightBlue)

This works well, if I click on an entry in my collection view and come back to the initial view controller. However, it doesn't get loaded on the first startup of the app.

Answer 1

Why don't you just create simple UIView with backgroundColor? You can place it by frame or constraint and it should work well.

I mean, you can even create it in Storyboard and don't use code at all