我想更新弹出框的布局，我已经尝试过使用setNeedsLayout()andlayoutIfNeeded()方法但找不到解决方案。
我有一个简单的屏幕，有 4 个调用弹出框的按钮，在弹出框内有 2 个额外的按钮：
- Button -> 隐藏 button3，并将 button1 和 button2 向左移动。
- 重新定位 -> 将弹出框的源视图从 button1/2/3/4（发送者）更改为 button4。 布局图
我遇到的问题是我无法更新/刷新屏幕，并且弹出框一直指向以前的源视图位置。 弹出框的图片
不知何故，我需要一种方法来更新我的视图，并且比layoutIfNeeded()因为如果屏幕从纵向/横向更改，弹出框会自动更改。在这里我改变了肖像/风景/肖像
项目的 GitHub。GitHub
使用的代码如下：
class ViewController: UIViewController, ButtonDidDisappearDelegate {
@IBOutlet weak var button1: UIButton!
@IBOutlet weak var button2: UIButton!
@IBOutlet weak var button3: UIButton!
@IBOutlet weak var button4: UIButton!
@IBOutlet weak var constrain2: NSLayoutConstraint!
var popVC: PopVC?
override func viewDidLoad() {
super.viewDidLoad()
}
@IBAction func buttonPopover(_ sender: UIButton) {
configureAndPresentPopover(from: sender)
}
func buttonDisappear() {
self.constrain2.constant = 100
self.button3.isHidden = !self.button3.isHidden
if !self.button3.isHidden {
self.constrain2.constant = 10
}
}
func repositionPopover() {
DispatchQueue.main.async {
if let popVC = self.popVC {
self.self.popoverPresentationController(popVC.popoverPresentationController!, willRepositionPopoverTo: self.button4.bounds, in: self.button4)
}
self.view.setNeedsLayout()
self.view.layoutIfNeeded()
}
}
}
extension ViewController: UIPopoverPresentationControllerDelegate {
func configureAndPresentPopover(from sender: UIButton) {
popVC = storyboard?.instantiateViewController(withIdentifier: "popVC") as? PopVC
guard let popVC = popVC else {
return
}
popVC.popOverDelegate = self
popVC.modalPresentationStyle = .popover
let popOverVC = popVC.popoverPresentationController
popOverVC?.delegate = self
popOverVC?.sourceView = sender
popOverVC?.sourceRect = sender.bounds
popVC.preferredContentSize = CGSize(width: 300, height: 60)
popOverVC?.permittedArrowDirections = .down
self.present(popVC, animated: true)
}
func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
return .none
}
func popoverPresentationController(_ popoverPresentationController: UIPopoverPresentationController,
willRepositionPopoverTo rect: CGRect,
in view: UIView) {
popoverPresentationController.sourceView = view
popoverPresentationController.sourceRect = rect
}
}
和弹出控制器：
protocol ButtonDidDisappearDelegate: class {
func configureAndPresentPopover(from sender: UIButton)
func buttonDisappear()
func repositionPopover()
}
class PopVC: UIViewController {
weak var popOverDelegate: ButtonDidDisappearDelegate?
override func viewDidLoad() {
super.viewDidLoad()
}
@IBOutlet weak var popoverButton: UIButton!
@IBAction func popoverAction(_ sender: Any) {
popOverDelegate?.buttonDisappear()
DispatchQueue.main.async {
self.view.setNeedsLayout()
self.view.layoutIfNeeded()
}
}
@IBAction func reposition(_ sender: Any) {
popOverDelegate?.repositionPopover()
}
}