single border for UITextField within a UIcollectionViewCell (swift 3 xcode) - ios

Question

I'm trying to apply a single bottom border to a textField that sits within one of my collectionViewCells. Here is the code:
class AddressCell: UICollectionViewCell {
override init(frame: CGRect) {
super.init(frame: frame)
setupViews()
}
func basicTextField(placeHolderString: String) -> UITextField {
let textField = UITextField()
textField.font = UIFont.boldSystemFont(ofSize: 12)
textField.attributedPlaceholder = NSAttributedString(string: placeHolderString, attributes:[NSForegroundColorAttributeName: UIColor.lightGray, NSFontAttributeName: UIFont.boldSystemFont(ofSize: 12)])
textField.backgroundColor = UIColor.white
textField.translatesAutoresizingMaskIntoConstraints = false
return textField
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setupViews() {
backgroundColor = UIColor.white
layer.addBorder(edge: UIRectEdge.bottom, color: .black, thickness: 0.5)
let streetTextfield = basicTextField(placeHolderString: "street")
addSubview(streetTextfield)
}
}
I am using an extension that enables me to apply a single border, which has worked great so far:
extension CALayer {
func addBorder(edge: UIRectEdge, color: UIColor, thickness: CGFloat) {
let border = CALayer()
switch edge {
case UIRectEdge.top:
border.frame = CGRect.init(x: 0, y: 0, width: frame.width, height: thickness)
break
case UIRectEdge.bottom:
border.frame = CGRect.init(x: 0, y: frame.height - thickness, width: frame.width, height: thickness)
break
case UIRectEdge.left:
border.frame = CGRect.init(x: 0, y: 0, width: thickness, height: frame.height)
break
case UIRectEdge.right:
border.frame = CGRect.init(x: frame.width - thickness, y: 0, width: thickness, height: frame.height)
break
default:
break
}
border.backgroundColor = color.cgColor;
self.addSublayer(border)
}
}
When i simply add a borderWidth to the textfield like this:
textField.layer.borderWidth = 0.5
I get a border and it renders fine. However, when i apply the extension to add a bottom border, like this:
textField.layer.addBorder(edge: UIRectEdge.bottom, color: .black, thickness: 0.5)
the border doesn't apply for some reason.

Answer 1

I'm not sure about the extension, but I have a working solution for a TextField with a bottom border.
basically create a class BottomBorderedTextField subclassing UITextField and insert the following code:
class BottomBorderedTextField: UITextField {
override func draw(_ rect: CGRect) {
super.draw(rect)
//this is the color of the bottom border. Change to whatever you what
let color: UIColor = UIColor.rgb(red: 230, green: 230, blue: 230)
let bottomBorder = CALayer()
bottomBorder.frame = CGRect(x: 0, y: bounds.size.height - 1, width: bounds.size.width, height: 2)
bottomBorder.backgroundColor = color.cgColor
self.layer.addSublayer(bottomBorder)
}
}
Then on your basicTextField function set the return type to the BottomBorderedTextField class you just made. so your new code will look like:
func basicTextField(placeHolderString: String) -> BottomBorderedTextField {
let textField = BottomBorderedTextField()
textField.font = UIFont.boldSystemFont(ofSize: 12)
textField.attributedPlaceholder = NSAttributedString(string: placeHolderString, attributes:[NSForegroundColorAttributeName: UIColor.lightGray, NSFontAttributeName: UIFont.boldSystemFont(ofSize: 12)])
textField.backgroundColor = UIColor.white
textField.translatesAutoresizingMaskIntoConstraints = false
return textField
}

Answer 2

I wrote a UIView extension that accomplishes the same thing:
extension UIView {
func addBottomBorder(width: CGFloat, color: UIColor, alpha: CGFloat) {
let border = CALayer()
let width = width
border.borderColor = color.withAlphaComponent(alpha).cgColor
border.frame = CGRect(x: 0, y: self.frame.size.height - width, width: self.frame.size.width, height: self.frame.size.height)
border.borderWidth = width
self.layer.addSublayer(border)
self.layer.masksToBounds = true
}
}
Usage:
usernameField.addBottomBorder(width: 2.0, color: UIColor.white, alpha: 0.5)
Also, seems within setupViews() you're calling:
layer.addBorder... //this is being called on the collection view cells layer
As opposed to:
streetTextfield.layer.addBorder...