如何生长一个弹出控制器开发者社区

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func openView(sourceView: UIView?, sourceRect: CGRect?) {
    let vc = ViewControllerA()
    //Try popover
    if let sourceView = sourceView,
        let sourceRect = sourceRect {
            vc.modalPresentationStyle = .popover
            if let popover = vc.popoverPresentationController {
                vc.preferredContentSize = return CGSize(width: 390, height: 390)
                vc.presentationController?.delegate = self
                popover.sourceView = sourceView
                popover.sourceRect = sourceRect
                popover.permittedArrowDirections = [.up, .left]
                self.present(vc, animated: true, completion: nil)
                return
    //present it normally if there's no source view
    vc.modalPresentationStyle = .overCurrentContext
    vc.modalTransitionStyle = .crossDissolve
    self.present(vc, animated: true, completion: nil)
}

@IBAction func showPopover(_ sender: UIButton) {
    // Create controller
    guard let controller = storyboard?.instantiateViewController(withIdentifier: "Popover") else {
        return
    controller.modalPresentationStyle = .popover
    controller.preferredContentSize = CGSize(width: 200, height: 200)
    // Configure popover
    guard let popover = controller.popoverPresentationController else {
        return
    popover.permittedArrowDirections = .up
    popover.sourceView = self.view
    popover.sourceRect = sender.frame
    popover.delegate = self
    present(controller, animated: true, completion: nil)

问 如何生长一个弹出控制器 EN

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