iOS 弹框的几种方法.md

Popover

class ViewController: UIViewController {

    @IBAction func clicked(_ sender: Any) {

        let vc = UIHostingController(rootView: AlertView(cancel: {
            //
            self.dismiss(animated: true)
        }, done: { text in
            if text.isEmpty {
                return
            }
            self.dismiss(animated: true)
        }))
        vc.modalPresentationStyle = .popover
        vc.preferredContentSize = CGSize(width: 200, height: 200)
        let popoverVC = vc.popoverPresentationController
        popoverVC?.permittedArrowDirections = []
        popoverVC?.sourceView = view
        popoverVC?.sourceRect = view.bounds
        popoverVC?.delegate = self
        popoverVC?.popoverLayoutMargins = .zero
        popoverVC?.backgroundColor = .blue
        present(vc, animated: true)
    }
}

记得实现下面这个方法

extension ViewController: UIPopoverPresentationControllerDelegate {
    func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
        return .none
    }
}

UIView 弹出来

extension UIView {
    func showViewWithSpringAnimation(_ view: UIView, completion: (() -> Void)? = nil) {
        view.transform = CGAffineTransform(scaleX: 0.01, y: 0.01)
        view.center = CGPoint(x: self.frame.width / 2, y: self.frame.height / 2)
        
        // Animate the popover view into the screen
        UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.8, options: .curveEaseInOut, animations: {
            view.transform = CGAffineTransform.identity
        }) { completed in
            if completed {
                completion?()
            }
        }
    }
    
    func dismissWithAnimation(_ completion: (() -> Void)? = nil) {
        UIView.animate(withDuration: 0.3) {
            self.transform = CGAffineTransform(scaleX: 0.01, y: 0.01)
        } completion: { completed in
            if completed {
                self.removeFromSuperview()
                completion?()
            }
        }

    }
}

@IBAction func clicked(_ sender: Any) {
    let popoverView = UIView(frame: self.view.bounds)
    popoverView.backgroundColor = UIColor.black.withAlphaComponent(0.2)
    
    let containerView = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
    containerView.layer.cornerRadius = 10
    containerView.backgroundColor = .red
    
    popoverView.addSubview(containerView)
    containerView.center = popoverView.center
    
    popoverView.addGestureRecognizer(UITapGestureRecognizer(action: { _ in
        
        popoverView.dismissWithAnimation()
    }))
    
    self.view.addSubview(popoverView)
    self.view.showViewWithSpringAnimation(popoverView)

UIAlertController 的 私有API

http://iphonedevwiki.net/index.php/UIAlertController

vc.preferredContentSize = CGSize(width: 270, height: 300)

let alert = UIAlertController(title: nil, message: nil, preferredStyle: .alert)
alert.setValue(vc, forKeyPath: "contentViewController")

present(alert, animated: true)