I'm trying to apply gradient background to a UITextView object, not sure if it's possible because I get white background instead.
Here is my UIView extension:
extension UIView{
func setTextGradient(startColor:UIColor,endColor:UIColor)
{
let gradient:CAGradientLayer = CAGradientLayer()
gradient.colors = [startColor.cgColor, endColor.cgColor]
gradient.locations = [0.0 , 1.0]
gradient.startPoint = CGPoint(x: 0.0, y: 0.0)
gradient.endPoint = CGPoint(x: 0.0, y: 1.0)
gradient.frame = self.bounds
self.layer.insertSublayer(gradient, at: 0)
}
Here where I assign gradient to the text view:
detailTxtView.translatesAutoresizingMaskIntoConstraints = false
detailTxtView.bottomAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
detailTxtView.rightAnchor.constraint(equalTo: self.rightAnchor, constant: -8).isActive = true
detailTxtView.leftAnchor.constraint(equalTo: self.leftAnchor, constant: 8).isActive = true
detailTxtView.heightAnchor.constraint(equalTo: self.heightAnchor, multiplier: 0.5).isActive = true
detailTxtView.setTextGradient(startColor: Constants.Colors.bluLight, endColor: Constants.Colors.silver)
// Set up text
let attributedTxt = NSMutableAttributedString(string: titleStr, attributes:[NSFontAttributeName: UIFont(name: "Jazeel-Bold", size: 24)!, NSForegroundColorAttributeName: Constants.Colors.bluLight])
attributedTxt.append(NSAttributedString(string: "\n\n\(detailStr)", attributes:[NSFontAttributeName: UIFont(name: "HacenTunisia", size: 20)!, NSForegroundColorAttributeName: Constants.Colors.aluminum]))
let txtStyle = NSMutableParagraphStyle()
txtStyle.alignment = .center
let length = attributedTxt.string.count
attributedTxt.addAttribute(NSParagraphStyleAttributeName, value: txtStyle, range: NSRange(location: 0, length: length))
detailTxtView.attributedText = attributedTxt
Here are the colors in the Constants class:
struct Colors{
static let bluDark = UIColor(colorLiteralRed: 51/255, green: 50/255, blue: 80/255, alpha: 1)
static let bluLight = UIColor(colorLiteralRed: 68/255, green: 85/255, blue: 138/255, alpha: 1)
static let greenLight = UIColor(colorLiteralRed: 200/255, green: 255/255, blue: 132/255, alpha: 1)
static let mercury = UIColor(colorLiteralRed: 235/255, green: 235/255, blue: 235/255, alpha: 1)
static let silver = UIColor(colorLiteralRed: 214/255, green: 214/255, blue: 214/255, alpha: 1)
static let magnesium = UIColor(colorLiteralRed: 192/255, green: 192/255, blue: 192/255, alpha: 1)
static let aluminum = UIColor(colorLiteralRed: 169/255, green: 169/255, blue: 169/255, alpha: 1)
static let blu2 = UIColor(colorLiteralRed: 88/255, green: 120/255, blue: 166/255, alpha: 0.2)
static let bluLighter = #colorLiteral(red: 0.451, green: 0.5569, blue: 0.8314, alpha: 1) /* #738ed4 */
}
I always get white background when using the gradient method. Appreciate any suggestions.
i think you forget location
extension UIView
{
func setGradient(startColor:UIColor,endColor:UIColor)
{
let gradient:CAGradientLayer = CAGradientLayer()
gradient.colors = [startColor.cgColor, endColor.cgColor]
gradient.locations = [0.0 , 1.0]
gradient.startPoint = CGPoint(x: 0.0, y: 0.0)
gradient.endPoint = CGPoint(x: 0.0, y: 1.0)
gradient.frame = self.bounds
self.layer.insertSublayer(gradient, at: 0)
}
}
use
txtView.setGradient(startColor: UIColor.blue, endColor: UIColor.green)
Output:
You need to use locations property of CAGradientLayer
extension UIView{
func setGriadientBackrnd(color1: UIColor, color2: UIColor){
let gradientLayer = CAGradientLayer()
gradientLayer.frame = bounds
gradientLayer.colors = [color1.cgColor, color2.cgColor]
gradientLayer.locations = [0.5 , 0.5] //here you can set percentage of color part are display betwin 0 to 1
layer.insertSublayer(gradientLayer, at: 0)
}
}
Please check your code Output
Hi Folk try like that hope you helps,
let titleStr = "Hi How are you ?"
let detailStr = "HI How UR preparation..."
gradientTextview.translatesAutoresizingMaskIntoConstraints = false
gradientTextview.bottomAnchor.constraint(equalTo:self.view.bottomAnchor).isActive = true
gradientTextview.rightAnchor.constraint(equalTo: self.view.rightAnchor, constant: -8).isActive = true
gradientTextview.leftAnchor.constraint(equalTo: self.view.leftAnchor, constant: 8).isActive = true
gradientTextview.heightAnchor.constraint(equalTo: self.view.heightAnchor, multiplier: 0.5).isActive = true
gradientTextview.setGradient(startColor: UIColor(colorLiteralRed: 68/255, green: 85/255, blue: 138/255, alpha: 1), endColor: UIColor(colorLiteralRed: 214/255, green: 214/255, blue: 214/255, alpha: 1))
let attributedTxt = NSMutableAttributedString(string: titleStr, attributes:[NSFontAttributeName: UIFont (name: "HelveticaNeue-Bold", size: 20)! , NSForegroundColorAttributeName: UIColor(colorLiteralRed: 68/255, green: 85/255, blue: 138/255, alpha: 1)])
attributedTxt.append(NSAttributedString(string: "\n\n\(detailStr)", attributes:[NSFontAttributeName: UIFont (name: "HelveticaNeue-Bold", size: 18)! , NSForegroundColorAttributeName:UIColor(colorLiteralRed: 169/255, green: 169/255, blue: 169/255, alpha: 1)]))
let txtStyle = NSMutableParagraphStyle()
txtStyle.alignment = .center
let length = attributedTxt.string.characters.count
attributedTxt.addAttribute(NSParagraphStyleAttributeName, value: txtStyle, range: NSRange(location: 0, length: length))
gradientTextview.attributedText = attributedTxt
===============================================================
extension UIView{
func setTextGradient(startColor:UIColor,endColor:UIColor)
{
let gradient:CAGradientLayer = CAGradientLayer()
gradient.colors = [startColor.cgColor, endColor.cgColor]
gradient.locations = [0.0 , 1.0]
gradient.startPoint = CGPoint(x: 0.0, y: 0.0)
gradient.endPoint = CGPoint(x: 0.0, y: 1.0)
gradient.frame = self.bounds
self.layer.insertSublayer(gradient, at: 0)
}
NOTE:-
instead of view you can add self.gradientTextview also...
The gradient worked when I set it after setting text attributes
detailTxtView.attributedText = attributedTxt
detailTxtView.setTextGradient(startColor: Constants.Colors.silver, endColor: Constants.Colors.bluDark)
Related
How we can set gradient colour in UIButton using swift?
I have tried this:
func addGradient(btn : UIButton){
let color1 = UIColor(red: 221.0/255, green: 96.0/255, blue: 129.0/255, alpha: 1.0).cgColor
let color2 = UIColor(red: 171.0/255, green: 74.0/255, blue: 141.0/255, alpha: 1.0).cgColor
let gradientLayer = CAGradientLayer()
gradientLayer.colors = [color2,color1 ]
gradientLayer.locations = [0.0, 1.0]
gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.6)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.6)
btn.layer.insertSublayer(gradientLayer, at: 0)
}
it's not working properly.
Try below code hope it will fix your issue:
Uses:
override func viewDidAppear(_ animated: Bool) {
yesBtn.clipsToBounds = true
yesBtn.addGradient(btn: yesBtn)
}
Extension:
func addGradient(btn : UIButton){
let color1 = UIColor(red: 221.0/255, green: 96.0/255, blue: 129.0/255, alpha: 1.0).cgColor
let color2 = UIColor(red: 171.0/255, green: 74.0/255, blue: 141.0/255, alpha: 1.0).cgColor
let gradientLayer = CAGradientLayer()
gradientLayer.frame = btn.bounds
gradientLayer.colors = [color2,color1 ]
gradientLayer.locations = [0.0, 1.0]
gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.6)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.6)
btn.layer.insertSublayer(gradientLayer, at: 0)
}
I would like to add gradient layer to my navbar, but after I add it, layer hides my title, like its behind that new sublayer.
override func viewDidLoad() {
super.viewDidLoad()
self.title = "My Trips"
self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedString.Key.foregroundColor:UIColor.white]
//self.navigationController?.navigationBar.layer.addSublayer(gradientLayer)
self.navigationController?.navigationBar.layer.insertSublayer(gradientLayer, at: 1)
setupGradient()
}
let gradientLayer = CAGradientLayer()
func setupGradient() {
gradientLayer.colors = [
UIColor(red: 0.259, green: 0.188, blue: 0.475, alpha: 1).cgColor,
UIColor(red: 0.11, green: 0.024, blue: 0.369, alpha: 1).cgColor
]
gradientLayer.locations = [0, 1]
gradientLayer.startPoint = CGPoint(x: 0.25, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 0.75, y: 0.5)
gradientLayer.transform = CATransform3DMakeAffineTransform(CGAffineTransform(a: 0, b: 0.58, c: -0.58, d: 0, tx: 0.5, ty: 0))
gradientLayer.bounds = (self.navigationController?.navigationBar.bounds.insetBy(dx: -0.01*view.bounds.size.width, dy: -1*view.bounds.size.height))!
}
Use this line for inserting layer.
self.navigationController?.navigationBar.subviews.first?.layer.insertSublayer(gradientLayer, at: 0)
When I run the app the gradient layer frame doesn't match with UIView frame. I tried with below code:
let color1 = UIColor(red: 20.0/255, green: 43.0/255, blue: 81.0/255, alpha: 1.0).cgColor
let color2 = UIColor(red: 149.0/255, green: 45.0/255, blue: 122.0/255, alpha: 1.0).cgColor
let gradientLayer = CAGradientLayer()
gradientLayer.frame = self.backBarcodeSrch.bounds
gradientLayer.colors = [color1,color2 ]
gradientLayer.locations = [0.0, 1.0]
gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.6)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.6)
self.backBarcodeSrch.layer.addSublayer(gradientLayer)
Update the frame of gradientLayer in viewDidLayoutSubviews() in your ViewController.
class VC: UIViewController {
var gradientLayer = CAGradientLayer()
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
gradientLayer.frame = self.backBarcodeSrch.bounds
}
override func viewDidLoad() {
super.viewDidLoad()
self.addGradient()
}
func addGradient() {
let color1 = UIColor(red: 20.0/255, green: 43.0/255, blue: 81.0/255, alpha: 1.0).cgColor
let color2 = UIColor(red: 149.0/255, green: 45.0/255, blue: 122.0/255, alpha: 1.0).cgColor
gradientLayer.frame = self.backBarcodeSrch.bounds
gradientLayer.colors = [color1,color2 ]
gradientLayer.locations = [0.0, 1.0]
gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.6)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.6)
self.backBarcodeSrch.layer.addSublayer(gradientLayer)
}
}
try this :
func addGradientLayer() {
let color1 = UIColor(red: 20.0/255, green: 43.0/255, blue: 81.0/255, alpha:1.0).cgColor
let color2 = UIColor(red: 149.0/255, green: 45.0/255, blue: 122.0/255, alpha: 1.0).cgColor
let gradientLayer = CAGradientLayer()
gradientLayer.frame = self.backBarcodeSrch.bounds
gradientLayer.colors = [color1,color2 ]
gradientLayer.locations = [0.0, 1.0]
gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.6)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.6)
self.backBarcodeSrch.layer.addSublayer(gradientLayer)
}
override func viewDidLayoutSubviews() {
addGradientLayer()
}
I've set constraints for these UITextField like this
But when I custom the textfield it's gone over the constraint
emailTextField.backgroundColor = UIColor.clear
emailTextField.attributedPlaceholder = NSAttributedString(string: emailTextField.placeholder!, attributes: [NSAttributedString.Key.foregroundColor: #colorLiteral(red: 0.8039215803, green: 0.8039215803, blue: 0.8039215803, alpha: 1)])
emailTextField.borderStyle = .none
emailTextField.tintColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
let bottomLayer = CALayer()
bottomLayer.frame = CGRect(x: 0, y: 20, width: 1000, height: 0.7)
bottomLayer.backgroundColor = #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1)
emailTextField.layer.addSublayer(bottomLayer)
Run..
Please tell me why? Many thanks for that...
You have set CALayer width 1000. It should be width of your TextField.
Change below code:
Add below code to get updated frame of emailTextField and set the width of Layer:
emailTextField.setNeedsLayout()
emailTextField.layoutIfNeeded()
bottomLayer.frame = CGRect(x: 0, y: 20, width: emailTextField.frame.size.width, height: 0.7)
UPDATE
If you want to reuse this textField configuration you can create one function like below:
func setupTextField(textField: UITextField) {
textField.backgroundColor = UIColor.clear
textField.attributedPlaceholder = NSAttributedString(string: textField.placeholder!, attributes: [NSAttributedString.Key.foregroundColor: #colorLiteral(red: 0.8039215803, green: 0.8039215803, blue: 0.8039215803, alpha: 1)])
textField.borderStyle = .none
textField.tintColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
textField.setNeedsLayout()
textField.layoutIfNeeded()
let bottomLayer = CALayer()
bottomLayer.frame = CGRect(x: 0, y: 20, width: textField.frame.size.width, height: 0.7)
bottomLayer.backgroundColor = #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1)
textField.layer.addSublayer(bottomLayer)
}
You can call above method this way:
setupTextField(textField: textField)
I have a project in Swift 3 that I am using a gradient on the view. I placed a image on the view, but it is under the gradient layer so I was going to draw the image programmatically instead of with the storyboard. I can't seem to figure out how to get the image to be centered and to aspect fit inside the bounds of the view.
What I have...
//Gradient Background
let gradientLayer = CAGradientLayer()
gradientLayer.frame = self.view.frame
gradientLayer.colors = [UIColor(red: 0/255, green: 147/255, blue: 255/255, alpha: 1.0).cgColor, UIColor(red: 162/255, green: 134/255, blue: 255/255, alpha: 1.0).cgColor]
gradientLayer.locations = [0.0, 1.0]
gradientLayer.startPoint = CGPoint(x: 0.0, y: 1.0)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.0)
self.view.layer.addSublayer(gradientLayer)
//Image
let mainImage = UIImage(named:"WhiteLogoFront")
var mainImageView = UIImageView(image:mainImage)
self.view.addSubview(mainImageView)
You can try it
let mainImage = UIImage(named:"WhiteLogoFront")
var mainImageView = UIImageView(image:mainImage)
mainImageView.contentMode = .ScaleAspectFit
let gradientLayer = CAGradientLayer()
gradientLayer.frame = self.view.frame
gradientLayer.colors = [UIColor(red: 0/255, green: 147/255, blue: 255/255, alpha: 1.0).cgColor, UIColor(red: 162/255, green: 134/255, blue: 255/255, alpha: 1.0).cgColor]
gradientLayer.locations = [0.0, 1.0]
gradientLayer.startPoint = CGPoint(x: 0.0, y: 1.0)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.0)
self.view.layer.addSublayer(gradientLayer)
//Image
let mainImage = UIImage(named:"WhiteLogoFront")
var mainImageView = UIImageView(image:mainImage)
mainImageView.center = self.view.cente
mainImageView.contentMode = .ScaleAspectFit
self.view.addSubview(mainImageView)
Try this one