iOS 自定义弹框动画

开发过程中，我们经常要用到弹框作为提示框，有时系统默认的弹款不能满足我们的需求，这时就需要我们自己自定义，在弹框出来的时候给它一个动画效果，将视图背景设置为半透明，效果如下：

代码如下：

自定义的弹框view

import UIKit

class ShowView: UIView {

    override init(frame: CGRect) {
        super.init(frame: frame)
        self.backgroundColor = UIColor.black.withAlphaComponent(0.5)
        let button = UIButton.init(frame: .init(x: 0, y: 0, width: 200, height: 200))
        button.backgroundColor = UIColor.green
        button.setTitle("自定义的弹框", for: .normal)
        button.center = self.center
        button.addTarget(self, action: #selector(removeAction(sender:)), for: .touchUpInside)
        self.addSubview(button)

    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    //MARK: 弹框动画
    func animationWithAlertViewWithView() {

        var animation: CAKeyframeAnimation?
        animation = CAKeyframeAnimation(keyPath: "transform")
        animation?.duration = 0.2
        animation?.isRemovedOnCompletion = true
        animation?.fillMode = .forwards
        var values: [AnyHashable] = []
        values.append(NSValue(caTransform3D: CATransform3DMakeScale(1.0, 1.0, 1.0)))
        values.append(NSValue(caTransform3D: CATransform3DMakeScale(1.1, 1.1, 1.0)))
        values.append(NSValue(caTransform3D: CATransform3DMakeScale(1.0, 1.0, 1.0)))
        animation?.values = values
        self.layer.add(animation!, forKey: nil)

    }

    //MARK: 移除弹框
    @objc func removeAction(sender:UIButton) {        
        self.removeFromSuperview()    
    }

}

ViewController

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()        
        let button = UIButton.init(frame: .init(x: 0, y: 0, width: 50, height: 50))
        button.backgroundColor = UIColor.red
        button.setTitle("弹框", for: .normal)
        button.center = self.view.center
        button.addTarget(self, action: #selector(showAction), for: .touchUpInside)
        self.view.addSubview(button)    
}

    @objc func showAction() {   

        let showView = ShowView.init(frame: self.view.bounds)     
        self.view.window?.addSubview(showView)        
        showView.animationWithAlertViewWithView()    
    }
}