在尝试使用 SafariViewController 时遇到了一些类似的问题。当出现弹出窗口时，将我的问题跟踪到使用 SafariViewController。整理了一些代码来显示我的问题和可能的解决方案。
ViewController.swift：
/*
This view controller tries to boil down to the essence of a problem seen
when trying to use SafariViewController. The net result is DO NOT present
the SafariViewController when a popup is present.
This controller and the associated popup show 3 ways to
present the SafariViewController:
Always Good: This uses a button on the controller to simply call the
showSVC() routine and never had a problem.
Good: This is a work-around for the "Bad" case to follow. In this case,
we are using a button in a popup to bring up the SafariViewController.
The trick is to get rid of the popup before calling showSVC(). This is
done by dismissing the popup immediately without animation and then
adding a delay before calling showSVC(). Seems to work fine, but using
delays to accomplish things always seems a bit suspect. Use at your own risk.
Bad: When this goes bad, a blank white screen is presented with no way
to escape. Using "Reset Content and Settings..." in the simulator can
get one back to where it will work one time. It seemed originally that
this worked on iOS9 but not on iOS10. But now seems to fail similarly
on both iOS9 and iOS10. This case is dismissing the popup with animation
while trying to bring up the SafariViewController.
Other info: This view controller is embedded in a navigation controller -
basically to provide a navigation bar and button to act as the anchor
point for the popup. The popup provides two buttons that call back
to this controller with the "PopButtonPressedProtocol". This controller
uses the title in the popup's buttons to differentiate the "good" and
"bad" cases.
The problems shown by this example sounded similar to problems various
others reported, but these reports may be for other reasons, which may
or may not be similar.
*/
import UIKit
import SafariServices
class ViewController: UIViewController, UIPopoverPresentationControllerDelegate, PopButtonPressedProtocol {
@IBOutlet weak var btnAlwaysGood: UIButton!
@IBOutlet weak var btnPopup: UIBarButtonItem!
let webAddr = "http://www.google.com"
func delay(_ delay: Double, closure:@escaping ()->()) {
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + Double(Int64(delay * Double(NSEC_PER_SEC))) / Double(NSEC_PER_SEC), execute: closure)
}
func showSVC() {
let svc = SFSafariViewController(url: URL(string: webAddr)!)
self.present(svc, animated: true, completion: nil)
}
func popButtonPressed(_ button: UIButton) {
if let title = button.currentTitle {
switch title {
case "Bad":
dismiss(animated: true, completion: nil)
showSVC()
case "Good":
dismiss(animated: false, completion: nil)
delay(0.5, closure: { self.showSVC() })
default:
break
}
}
}
func popupButtonPressed() {
performSegue(withIdentifier: "popup", sender: nil)
}
func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle { // Needed for popup
return .none
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
btnAlwaysGood.addTarget(self, action: #selector(showSVC), for: .touchUpInside)
btnPopup.target = self
btnPopup.action = #selector(popupButtonPressed)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let vc = segue.destination as? PopVC {
vc.delegate = self
vc.modalPresentationStyle = .popover
vc.preferredContentSize = CGSize(width: 60, height: 100)
if let popover = vc.popoverPresentationController {
popover.permittedArrowDirections = .any
popover.delegate = self
popover.barButtonItem = navigationItem.rightBarButtonItem
}
}
}
}
PopVC.swift：
import UIKit
protocol PopButtonPressedProtocol : class {
func popButtonPressed(_ button: UIButton) // protocol:
}
class PopVC: UIViewController {
@IBOutlet weak var btnBad: UIButton!
@IBOutlet weak var btnGood: UIButton!
weak var delegate : PopButtonPressedProtocol?
func buttonPressed(_ button: UIButton) {
delegate?.popButtonPressed(button)
}
override func viewDidLoad() {
super.viewDidLoad()
btnBad.addTarget(self, action: #selector(buttonPressed(_:)), for: .touchUpInside)
btnGood.addTarget(self, action: #selector(buttonPressed(_:)), for: .touchUpInside)
}
}