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
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 want to apply gradient color on navigation bar. I applied that but the status bar color is not changing. Can anyone help me with this?
Here is the code for implementing the gradient color:
let colorTop = UIColor(red: 69/255, green: 90/255, blue: 195/255, alpha: 1.0).CGColor
let colorBottom = UIColor(red: 230/255, green: 44/255, blue: 75/255, alpha: 1.0).CGColor
let gradientLayer = CAGradientLayer()
gradientLayer.colors = [ colorTop, colorBottom]
gradientLayer.locations = [ 0.0, 1.0]
gradientLayer.frame = CGRectMake(0, 0, 375, 64)
self.navigationController?.navigationBar.layer.addSublayer(gradientLayer)
Use this:
gradientLayer.frame = CGRect(x:0, y:-20, width:375, height:64)
output:
In Swift3:
let colorTop = UIColor(red: 69/255, green: 90/255, blue: 195/255, alpha: 1.0).cgColor
let colorBottom = UIColor(red: 230/255, green: 44/255, blue: 75/255, alpha: 1.0).cgColor
let gradientLayer = CAGradientLayer()
gradientLayer.colors = [ colorTop, colorBottom]
gradientLayer.locations = [ 0.0, 1.0]
gradientLayer.frame = CGRect(x:0, y:-20, width:375, height:64)
self.navigationController?.navigationBar.layer.addSublayer(gradientLayer)
Replace
self.navigationController?.navigationBar.layer.addSublayer(gradientLayer) with
self.navigationController?.navigationBar.layer.sublayers?.insert(gradientLayer, at: 0)
Added image after building with above code
let gradient: CAGradientLayer = CAGradientLayer()
let colorTop = UIColor(red: 112.0/255.0, green: 219.0/255.0, blue: 155.0/255.0, alpha: 1.0).CGColor
let colorBottom = UIColor(red: 86.0/255.0, green: 197.0/255.0, blue: 238.0/255.0, alpha: 1.0).CGColor
gradient.colors = [colorTop, colorBottom]
gradient.startPoint = CGPoint(x: 0.0, y: 0.5)
gradient.endPoint = CGPoint(x: 1.0, y: 0.5)
gradient.frame = loginButton.bounds
gradient.cornerRadius = 5
loginButton.layer.addSublayer(gradient)
The resulting gradient runs off goes beyond the button's frame. Why does this happen?
Probably you are setting gradient layer in viewDidLoad() or viewWillAppear(). At that time controller did not calculated views sizes. At time you add this sublayer button size was not calculated yet, so sublayer size is wrong. So you should fix next things:
First of all you should add gradient at viewDidAppear(), at this point all view's sizes are calculated.
Second, you should use layer.insertSublayer(layer, atIndex:index) instead of addSublayer(layer). Because in your case sublayer will hide buttons native layer (title, background...)
You should recalculate your sublayer size in viewDidLayoutSubviews(). Because when your button will change it's size (while rotating for example), sublayer will not change it's frame, so you should change it by yourself.
Add clipsToBounds and cornerRadius to loginbutton. That should fix the problem.
loginButton.clipsToBounds = true
loginButton.layer.cornerRadius = 5;
Is your Login Button's frame correct?It seems correct when I reproduce
let loginButton = UIButton(frame: CGRect(x: 10, y: 50, width: 300, height: 30))
self.view.addSubview(loginButton)
let gradient:CAGradientLayer = CAGradientLayer()
let colorTop = UIColor(red: 112.0/255.0, green: 219.0/255.0, blue: 155.0/255.0, alpha: 1.0).CGColor
let colorBottom = UIColor(red: 86.0/255.0, green: 197.0/255.0, blue: 238.0/255.0, alpha: 1.0).CGColor
gradient.colors = [colorTop, colorBottom]
gradient.startPoint = CGPoint(x: 0.0, y: 0.5)
gradient.endPoint = CGPoint(x: 1.0, y: 0.5)
gradient.frame = loginButton.bounds
gradient.cornerRadius = 5
loginButton.layer.addSublayer(gradient)
And it appear like below