Question

我已经构建了一个操纵CIImages的渲染器，我想展示进度。我似乎无法弄清楚如何更新ui。渲染完成后，ui会更新。

这是我的设置，简化：

DispatchQueue.global(qos: .background).async(execute: {
    for i in 0..<count {
        // CIImage manipulation and definition of progress
        DispatchQueue.main.async(execute: {
            self.progress.doubleValue = progress
        })
    }
})

从here获得DispatchQueue代码。

注意，我正在使用旋转滚轮鼠标。

这是我的渲染方法的全部细节：

@IBAction func render_now(_ sender: Any) {

    self.render_button.isEnabled = false

    self.duration = self.player_x1?.currentItem?.asset.duration.seconds

    let videoATrack: AVAssetTrack = (self.player_x1?.currentItem?.asset.tracks(withMediaType: AVMediaTypeVideo).last)!
    self.fps = CMTimeScale(videoATrack.nominalFrameRate)
    self.frame_count = Int(self.duration! * Double(self.fps!))

    let asset_generator = AVAssetImageGenerator(asset: (self.player_x1?.currentItem?.asset)!)
    var time_zero = kCMTimeZero
    var asset_image_arr: [CGImage] = []
    do {
        for i in 0..<self.frame_count! {

            let time = Double(i) / Double(self.fps!)
            let asset_image = try asset_generator.copyCGImage(at: CMTime(seconds: time, preferredTimescale: self.fps!), actualTime: &time_zero)
            asset_image_arr.append(asset_image)

        }
    } catch {print("err")}

    let image_size = CGSize(width: asset_image_arr[0].width, height: asset_image_arr[0].height)
    var ci_image_arr: [CIImage] = []
    for i in 0..<self.frame_count! {
        ci_image_arr.append(CIImage(cgImage: asset_image_arr[i], options: nil))
    }

    let x_factor = Int(NSDecimalNumber(decimal: pow(2, self.radio_index! + 1)))

    let filter_brightness = CIFilter(name: "CIToneCurve")
    let brightness = 1.0 / CGFloat(x_factor)
    filter_brightness?.setValue(CIVector(x:0.0, y: 0.0), forKey: "inputPoint0")
    filter_brightness?.setValue(CIVector(x:0.25, y: 0.25 * brightness), forKey: "inputPoint1")
    filter_brightness?.setValue(CIVector(x:0.50, y: 0.5 * brightness), forKey: "inputPoint2")
    filter_brightness?.setValue(CIVector(x:0.75, y: 0.75 * brightness), forKey: "inputPoint3")
    filter_brightness?.setValue(CIVector(x:1.0, y: 1.0 * brightness), forKey: "inputPoint4")

    let filter_add = CIFilter(name: "CIAdditionCompositing")

    var images: [NSImage] = []

    DispatchQueue.global(qos: .background).async(execute: {

        for i in 0..<self.frame_count! / x_factor {

            filter_brightness?.setValue(ci_image_arr[i * x_factor], forKey: kCIInputImageKey)
            var ci_image: CIImage = (filter_brightness?.outputImage)!

            for x in 1..<x_factor {

                filter_brightness?.setValue(ci_image_arr[i * x_factor + x], forKey: kCIInputImageKey)
                let ci_image_add: CIImage = (filter_brightness?.outputImage)!

                filter_add?.setValue(ci_image, forKey: kCIInputImageKey)
                filter_add?.setValue(ci_image_add, forKey: kCIInputBackgroundImageKey)

                ci_image = (filter_add?.outputImage)!

            }
            let rep: NSCIImageRep = NSCIImageRep(ciImage: ci_image)
            let nsImage: NSImage = NSImage(size: rep.size)
            nsImage.addRepresentation(rep)

            images.append(nsImage)

            let progress = Double(i) / Double(self.frame_count! / x_factor - 1) * 100.0
            DispatchQueue.main.async(execute: {
                print(progress)
                self.progress.doubleValue = progress
            })

        }

    })

    let desktopURL = FileManager.default.urls(for: .desktopDirectory, in: .userDomainMask).first!

    let movie_out = MovieOut()
    movie_out.writeImagesAsMovie(images, path: self.movie_out_x_urls[self.radio_index! - 1].path, size: image_size, fps: self.fps!) { () -> () in

        let player_x = AVPlayer(url: self.movie_out_x_urls[self.radio_index! - 1])
        self.player_view.player = player_x
        self.view.addSubview(self.player_view)
        self.save_button.isEnabled = true
    }

}

任何人都知道我做错了什么？

NSProgressIndicator不在后台线程中更新 - Swift 3

0 个答案: