SplashAnimate

A simple App splash animation

准备工作：

首先我们需要确定作为宣传的图片的宽高比，这个一般是与 UI 确定的。一般启动屏展示会有上下两部分，上面是宣传图片，下面是 App 的 Logo。

实现基本思路：

在 LaunchScreen 结束后，在 AppDelegate 中将 rootViewController 指向展示广告用的 AdViewController，在AdViewController 中设置一段时间后自己销毁，并提供回调方法在 AppDelegate 中将 rootViewController 指向 App 真正的首页。

实现细节：

新建一个 AdViewController 用于放置广告宣传等展示.注意有一个回调方法。

class AdViewController: UIViewController {
    // 用于 AdViewController 销毁后的回调
    var completion: (() -> Void)?

    var adImage: UIImage?
    var adView: UIImageView?

    override func viewDidLoad() {
        // ....
    }
}

在 ViewDidLoad 方法中配置广告图,同时判断 iPhoneX的特殊情况

override func viewDidLoad() {
    super.viewDidLoad()

    var adViewHeight = (1040 / 720) * screenWidth
    var imageName = "start_page"
    if UIDevice.isiPhoneX() {
        adViewHeight = (1920 / 1124) * screenWidth
        imageName = "start_page_x"
    }

    adView = UIImageView(frame: CGRect(x: 0, y: 0, width: screenWidth, height: adViewHeight))
    adView?.image = UIImage(named: imageName)
    adView?.contentMode = .scaleAspectFill
    self.view.addSubview(adView!)

    let bottomHolderView = UIView(frame: CGRect(x: 0, y: screenHeight-120, width: screenWidth, height: 120))
    self.view.addSubview(bottomHolderView)

    let logo = UIImageView(frame: CGRect(x: (screenWidth-120)/2, y: (120-50)/2, width: 120, height: 50))
    logo.image = UIImage(named: "start_logo")
    bottomHolderView.addSubview(logo)

    let time: TimeInterval = 1.0
    DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + time) {
        self.dismissAdView()
    }
}

上面代码中有几个注意的:

因为图片要撑满屏幕的宽度，所以宽度是固定的，根据图片的高宽比，算出图片实际应有的高度，这样图片可以在各个尺寸的 iPhone 中才不会因为拉伸而变形。但是因为 iPhoneX 特殊的宽高比，所以还是要为它特定一张图片，不然即使图片在 iPhoneX 上不变形，图片所占的高度会太小，或者顶部被刘海遮挡内容而不美观。

var adViewHeight = (1040 / 720) * screenWidth
var imageName = "start_page"
if UIDevice.isiPhoneX() {
    adViewHeight = (1920 / 1124) * screenWidth
    imageName = "start_page_x"
}

上面判断是否为 iPhoneX 我是在 UIDevice 里扩展了一个方法：

extension UIDevice {
    public static func isiPhoneX() -> Bool {
        if UIScreen.main.bounds.height == 812 {
            return true
        }
        return false
    }
}

还有注意在执行销毁时调用回调方法

let time: TimeInterval = 1.0
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + time) {
    self.dismissAdView()
}

在 AppDelegate 中 didFinishLaunchingWithOptions 方法中调用下面的 setUpWindowAndRootView() 来管理页面展示

extension AppDelegate {

    func setUpWindowAndRootView() {
        window = UIWindow(frame: UIScreen.main.bounds)
        window!.backgroundColor = UIColor.white
        window!.makeKeyAndVisible()

        let adVC = AdViewController()
        adVC.completion = {
            let vc = ViewController()
            vc.adView = adVC.view
            self.window!.rootViewController = vc
        }
        window!.rootViewController = adVC
    }
}

注意在 AdViewController 销毁的回调方法中，将 AdViewController 的 view 传给真正的首页，让首页来执行动画

adVC.completion = {
    let vc = ViewController()
    // 将 AdViewController 的 view 传给真正的首页，让首页来执行动画
    vc.adView = adVC.view
    self.window!.rootViewController = vc
}

在首页 ViewController 里我们有如下方法来执行 AdViewController 的销毁动画，这里配置的动画是常见的扩大渐变消失

private var advertiseView: UIView?
var adView: UIView? {
    didSet {
        advertiseView = adView!
        advertiseView?.frame = self.view.bounds
        self.view.addSubview(advertiseView!)
        UIView.animate(withDuration: 1.5, animations: { [weak self] in
                self?.advertiseView?.transform = CGAffineTransform(scaleX: 1.2, y: 1.2)
                self?.advertiseView?.alpha = 0
        }) { [weak self] (isFinish) in
                self?.advertiseView?.removeFromSuperview()
                self?.advertiseView = nil
        }
    }
}

至此，一个简单的启动屏动画就完成了. 我的博客myhanson

License

zyphs21/SplashAnimate

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