将大型视频保存到PHPhotolibrary可能需要一段时间，并且应该显示UIProgressView。我很惊讶我找不到已经问过的问题。有人实现过这样的东西吗？

计数时超级简单...

progressView.progress = 0.0
progress.completedUnitCount = 0
let progress = Progress(totalUnitCount: 10)
self.progress.completedUnitCount += 1
self.progressView.setProgress(Float(self.progress.fractionCompleted),animated: true)
self.progressLabel.text = "\(Int(self.progress.fractionCompleted * 100)) %"