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在 Swift 3 中使用 Alamofire 为 macOS 应用程序下载文件时，我试图显示进度。

这是我所拥有的：

func downloadFile() {
    progressIndicator.isHidden = false
    progressIndicator.minValue = 0
    progressIndicator.maxValue = 10
    progressIndicator.isIndeterminate = false

    outputTextField.stringValue = ""

    let mainURL = "https://somethinghere.org/macos/\(comboCellBox.stringValue)"
    let destination = DownloadRequest.suggestedDownloadDestination(for: .downloadsDirectory)
    Alamofire.download(mainURL, to: destination)
        .downloadProgress(queue: DispatchQueue.global(qos: .utility)) { progress in
            print("Download Progress: \(progress.fractionCompleted)")

         // I want to show progress from .fractionCompleted to NSProgressIndicator here

        }
        .responseJSON { response in
            debugPrint(response)
            }
}

对于每个 .fractionCompleted，我希望 NSProgressIndicator 显示和动画下载进度。

我不知道从哪里开始，我想知道是否有人可以帮助我开始。我已阅读 Alamofire 文档，但找不到任何相关内容。

编辑：

输出：

print("Download Progress: \(progress.fractionCompleted)")

看起来像这样：

Download Progress: 0.00208984202190035
Download Progress: 0.198987043477936
Download Progress: 0.298296286511484
Download Progress: 0.397831087926645
Download Progress: 0.49933983672564
Download Progress: 0.598874638140801
Download Progress: 0.698409439555962
Download Progress: 0.797944240971122
Download Progress: 0.897479042386283
Download Progress: 0.997013843801444
Download Progress: 1.0

回答：

self.progressIndicator.doubleValue = progress.fractionCompleted
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1 回答 1

1

回答

func downloadFile() {
    progressIndicator.isHidden = false
    progressIndicator.minValue = 0
    progressIndicator.maxValue = 10
    progressIndicator.isIndeterminate = false

    outputTextField.stringValue = ""

    let mainURL = "https://somethinghere.org/macos/\ .(comboCellBox.stringValue)"
    let destination = DownloadRequest.suggestedDownloadDestination(for: .downloadsDirectory)
    Alamofire.download(mainURL, to: destination)
    .downloadProgress { progress in
            print("Download Progress: \(progress.fractionCompleted)")
            self.progressIndicator.doubleValue = progress.fractionCompleted
        }
    }
    .responseJSON { response in
        debugPrint(response)
        }
}
于 2017-01-24T08:46:56.630 回答