Swift如何制作类似于iOS App Launch动画的动画

Question

我正在做一个巨大的秘密项目，它是iOS GUI的复制品，我想制作一个动画，当我们在iOS的主屏幕上打开应用程序时。

我正在用Swift语言制作应用程序。 如果您按一个按钮，例如消息图标，消息ViewController将显示iOS动画（缩放和缩小图标）

Answer 1

以下是放大和缩小动画的完整示例代码：

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var sampleImage: UIImageView!
    var isFullScreen = Bool()
    var prevFrame = CGRect()

    override func viewDidLoad() {
        super.viewDidLoad()
        isFullScreen = false

        // add tap gesture into your image
        var tapGestureRecognizer = UITapGestureRecognizer(target:self, action:Selector("imageTapped:"))
        sampleImage.addGestureRecognizer(tapGestureRecognizer)
    }

    func imageTapped(img: AnyObject){

        //Code for zoom in and zoom out animation
        if !isFullScreen {

            UIView.animateWithDuration (0.5, delay: 0.0, options: nil ,animations: {
                self.prevFrame = self.sampleImage.frame
                self.sampleImage.frame = UIScreen.mainScreen().bounds
                }, completion: { _ in
                    self.isFullScreen = true
            })
        } else {

            UIView.animateWithDuration (0.5, delay: 0.0, options: nil ,animations: {
                self.sampleImage.frame = self.prevFrame
                }, completion: { _ in
                    self.isFullScreen = false
            })
        }
    }
}