Note: This only supports iOS 14 and above and can only be used in Xcode 12+.

注意：此功能仅支持iOS 14及更高版本，并且只能在Xcode 12+中使用。

先决条件 (Prerequisites)

To follow along with this tutorial, you’ll need some basic knowledge in:

要继续学习本教程，您将需要一些基本知识：

• SwiftSwift
• At least Xcode 12+至少Xcode 12+

不确定的进度 (Indeterminate Progress)

Indeterminate refers to a nonstop animation, and by default, it is in an indeterminate behaviour that spins endlessly:

不确定是指不间断的动画，默认情况下，它处于不确定的行为中，会不断旋转：

ProgressView("Loading…")

线性进展 (Linear Progress)

In order to create a linear progress view, you will have to specify the current value and the total value. The value is currently being set at 50, which is half of the total:

为了创建线性进度视图，您将必须指定当前值和总值。 该值当前设置为50 ，是总数的一半：

ProgressView("Downloading…", value: 50, total: 100)    .padding()

You can even see it in action with the linear progress view continuing to progress. First, you will create a state where it will keep track of its current progress:

您甚至可以在线性进度视图继续进行的情况下查看它的运行情况。 首先，您将创建一个状态来跟踪当前的进度：

@State private var currentProgress = 0.0

Then you will create a timer with the following code:

然后，您将使用以下代码创建一个计时器：

let timer = Timer.publish(every: 0.1, on: .main, in: .common).autoconnect()

Next, use the current progress in the progress view:

接下来，在进度视图中使用当前进度：

ProgressView("Downloading…", value: currentProgress, total: 100)

Add an action to the progress view whereby it will continually add 1 until it reaches 100:

在进度视图中添加一个操作，它将持续添加1直到达到100 ：

.onReceive(timer) { _ in    if currentProgress < 100 {        currentProgress += 1    }}

As a result:

结果是：

客制化 (Customisation)

accentColor allows you to edit the color of the bar:

accentColor允许您编辑条的颜色：

.accentColor(.green)

foregroundColor allows you to edit the color of the title:

foregroundColor可让您编辑标题的颜色：

.foregroundColor(.yellow)

Thanks for reading!

谢谢阅读！