我在homeViewController上自定义了Floating UIButton，并将其显示在其他viewControllers中。我尝试使用此方法将其删除
if roundButton.superView！= nil { DispatchQueue.main.async { roundButton.removeFromSuperview（） roundButton =零 } }
但是在我按下一次后它会删除它，并且从不显示它消失了。如果有人知道如何将其从其他viewControllers删除并仅在HomeviewController上显示，将不胜感激。这是我的代码
override func viewDidLoad() {
super.viewDidLoad()
tableView.rowHeight = UITableView.automaticDimension
tableView.estimatedRowHeight = 200
tabBarController?.customizableViewControllers = nil
createFloatingButton()
buttonSetup()
navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)
}
override func viewDidAppear(_ animated: Bool) {
if UserDefaults.standard.bool(forKey: "hasViewedWalkthrough") {
return
}
let storyboard = UIStoryboard(name: "Onboarding", bundle: nil)
if let walkthroughViewController = storyboard.instantiateViewController(withIdentifier: "WalkthroughViewController") as? WalkthroughViewController {
present(walkthroughViewController, animated: true, completion: nil)
}
}
func createFloatingButton() {
roundButton = UIButton(type: .custom)
roundButton.translatesAutoresizingMaskIntoConstraints = false
roundButton.backgroundColor = .white
// Make sure you replace the name of the image:
roundButton.setImage(UIImage(named:"nile1"), for: .normal)
roundButton.imageView?.layer.cornerRadius = 37.5
// create a function
roundButton.addTarget(self, action: #selector(clickhereButtonPressed(_:)), for: UIControl.Event.touchUpInside)
roundButton.setNeedsLayout()
roundButton.layoutIfNeeded()
// We're manipulating the UI, must be on the main thread:
DispatchQueue.main.async {
if let keyWindow = UIApplication.shared.keyWindow {
keyWindow.addSubview(self.roundButton)
NSLayoutConstraint.activate([
keyWindow.trailingAnchor.constraint(equalTo: self.roundButton.trailingAnchor, constant: 10),
keyWindow.bottomAnchor.constraint(equalTo: self.roundButton.bottomAnchor, constant: 90),
self.roundButton.widthAnchor.constraint(equalToConstant: 75),
self.roundButton.heightAnchor.constraint(equalToConstant: 75)])
}
// Make the button round:
self.roundButton.layer.cornerRadius = 37.5
// Add a black shadow:
self.roundButton.layer.shadowColor = UIColor.black.cgColor
self.roundButton.layer.shadowOffset = CGSize(width: 0.0, height: 5.0)
self.roundButton.layer.masksToBounds = false
self.roundButton.layer.shadowRadius = 2.0
self.roundButton.layer.shadowOpacity = 0.5
// Add a pulsing animation to draw attention to button:
let scaleAnimation: CABasicAnimation = CABasicAnimation(keyPath: "transform.scale")
scaleAnimation.duration = 0.4
scaleAnimation.repeatCount = .greatestFiniteMagnitude
scaleAnimation.autoreverses = true
scaleAnimation.fromValue = 1.0;
scaleAnimation.toValue = 1.05;
self.roundButton.layer.add(scaleAnimation, forKey: "scale")
}
}