ios - Firebase iOS - 将 StorageUploadTask 进度从 Double 转换为 Int

Question

我正在将视频文件上传到 Firebase 存储，我正在使用进度指示器来显示它的进度。一切正常，除了我无法让它显示 Int(整数)，它正在显示 Doubles，例如:

数字应该是整数，例如 0%、33% 和 96%

我尝试将 Double 类型的 percentLabel 转换 为 Int 但它一直崩溃:

let percentComplete: Double = 100.0 * Double(completedUnitCount) / Double(totalUnitCount)
self?.progressLabel.text = "\(Int(percentComplete))%"

我怎样才能让这些 double 变成整数？

var uploadTask: StorageUploadTask?

uploadTask = videoIdRef?.putFile(from: videoUrl)

uploadTask?.observe(.progress, handler: {
    [weak self] (snapshot) in

    if let completedUnitCount = snapshot.progress?.completedUnitCount, let totalUnitCount =

        snapshot.progress?.totalUnitCount {

        let uploadProgress:Float = Float(completedUnitCount) / Float(totalUnitCount)
        self?.progressView.progress = uploadProgress   

        let percentComplete = 100.0 * Double(completedUnitCount) / Double(totalUnitCount)
        self?.progressLabel.text = "\(percentComplete)%"
    }
})

Answer 1

你可以为此使用简单的字符串初始化器

String(format: "%.0f", floor(percentComplete))