When I run ContentView.swift code as follows
import SwiftUI
import UIKit
class MainViewController: UIViewController{
let collectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
let darkGrey = UIColor(hexString: "#757575")
cv.backgroundColor = UIColor(hexString: "#757575")
return cv
}()
override func viewDidLoad(){
super.viewDidLoad()
view.addSubview(collectionView)
collectionView.frame = view.frame
}
}
extension UIColor {
convenience init(hexString: String) {
let hex = hexString.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
var int = UInt64()
Scanner(string: hex).scanHexInt64(&int)
let a, r, g, b: UInt64
switch hex.count {
case 3: // RGB (12-bit)
(a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
case 6: // RGB (24-bit)
(a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
case 8: // ARGB (32-bit)
(a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
default:
(a, r, g, b) = (255, 0, 0, 0)
}
self.init(red: CGFloat(r) / 255, green: CGFloat(g) / 255, blue: CGFloat(b) / 255, alpha: CGFloat(a) / 255)
}
}
I get a white screen on Canvas and I don`t understand why my code does not work since I built an extesion UIColor. I tried also writing cv.backgroundColor = .green without extesion UIColor but I obtain the same result. Any idea would be appreciated! Thank you for your patience.