ios - 每秒截取 20 张屏幕截图 Swift？

Question

我想每秒截取 20 个屏幕截图，持续 3 秒，所有这些都添加到 UIImage 数组中，该数组被转换成视频。

这是我用来截图的代码:

func screenshot() {
        var imageSize = CGSize.zero

        let orientation = UIApplication.shared.statusBarOrientation
        if UIInterfaceOrientationIsPortrait(orientation) {
            imageSize = UIScreen.main.nativeBounds.size
        } else {
            imageSize = CGSize(width: UIScreen.main.nativeBounds.size.height, height: UIScreen.main.nativeBounds.size.width)
        }

        UIGraphicsBeginImageContextWithOptions(imageSize, false, 0)
        for window in UIApplication.shared.windows {
            window.drawHierarchy(in: window.bounds, afterScreenUpdates: true)
        }

        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        images.append(image!)

    }

我已阅读以下内容 question ，虽然它很老旧，而且我确信它可以在 20FPS 下持续 3 秒，但我不确定哪种方法是实现它的最佳方法。

编辑: 使用 UIScreen.main.nativeBounds.size 而不是 UIScreen.main.bounds.size 否则你会得到“错误的”图像大小，这可能会很痛苦.如果 Display Zoom 设置为 Zoomed 而不是标准 Credit:@ Christopher Pickslay

Answer 1

这有效:

var limit = 80 

func capture() {

     if limit > 0 {

     delay(0.03) {

     self.screenshot()

     self.capture()

   } else {

convertToVideo()

}

 func screenshot()  {

        var imageSize = CGSize.zero

        let orientation = UIApplication.shared.statusBarOrientation
        if UIInterfaceOrientationIsPortrait(orientation) {
            imageSize = UIScreen.main.nativeBounds.size
        } else {
            imageSize = CGSize(width: UIScreen.main.nativeBounds.size.height, height: UIScreen.main.nativeBounds.size.width)
        }

        UIGraphicsBeginImageContextWithOptions(imageSize, false, 0)
        for window in UIApplication.shared.windows {
            window.drawHierarchy(in: window.bounds, afterScreenUpdates: true)
        }

        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        images.append(image!)

        limit = limit - 1

    }

延迟是:

func delay(_ delay:Double, closure:@escaping ()->()) {
    DispatchQueue.main.asyncAfter(
        deadline: DispatchTime.now() + Double(Int64(delay * Double(NSEC_PER_SEC))) / Double(NSEC_PER_SEC), execute: closure)
}