我将如何测量forEach
循环的进度并将其显示在进度栏中?我将旋转垂直图像以使其变为水平。每次要转换的图像数量都会不同。
这里是我进行的转换图像的工作,我只需要一种向用户显示进度的方法:
func rotateandSave(files: [URL]) {
files.forEach { file in
let path = file
let image = NSImage(contentsOf: path)
let rotatedImage = image?.rotated(by: rotateAngle)
saveImage(image: rotatedImage!, destination: path)
}
}
您可以将ProgressView用于简单的进度条。您可以像其他视图一样将其添加到视图控制器中(作为@IBOutlet弱变量)。在viewDidLoad()中,将进度设置为0,以使栏开始为空。
ProgressView的进度设置在0.0-1.0的范围内,并且可以设置动画选项(我想您希望这样做)。要更新ProgressView,您可以修改现有功能:
@IBOutlet weak var progressView: UIProgressView!
...
func rotateandSave(files: [URL]) {
let numFiles = files.count
let fileNum = 0
files.forEach { file in
let path = file
let image = NSImage(contentsOf: path)
let rotatedImage = image?.rotated(by: rotateAngle)
saveImage(image: rotatedImage!, destination: path)
progressBar.setProgress(Double(fileNum)/Double(numFiles), true)
fileNum += 1
}
}
您可以使用ProgressView
显示进度条。您可以将其添加到您的控制器,如下所示:
@IBOutlet weak var progressView: UIProgressView!
override func viewDidLoad() {
super.viewDidLoad()
progressView.progress = 0.0
}
func rotateandSave(files: [URL]) {
var numberOfFile = files.count
var fileCounter = 0
files.forEach { file in
let path = file
let image = NSImage(contentsOf: path)
let rotatedImage = image?.rotated(by: rotateAngle)
saveImage(image: rotatedImage!, destination: path)
fileCounter + =1
let progress = (Double(fileCounter)/Double(numberOfFile))
progressView.setProgress(progress, animated: true)
}
}
此时,当progressView的进度达到最大时,您可以执行自己的操作