swift iOS中的屏幕截图？ [英] Screenshot in swift iOS?

问题描述

有谁知道如何通过代码（在swift中）从我的屏幕截取屏幕截图并保存？
我可以截取屏幕并将其另存为图像吗？

Does anyone know how can I take screenshot from my screen by code (in swift) and save it? Can I take screenshot and save it as image?

我看了，我看到了这段代码，但我不能用它（我想），因为它没有做任何事情......

I've looked and I see this code, but I can't use it (I Think) because it doesn't do anything..

    var screen:UIScreen = UIScreen.mainScreen()
    snapshotVieww = screen.snapshotViewAfterScreenUpdates(false)
    UIGraphicsBeginImageContextWithOptions(screen.bounds.size, false, 0);
    snapshotVieww.drawViewHierarchyInRect(view.bounds, afterScreenUpdates: true)
    var image:UIImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    provino = UIImageView(image: image)

先谢谢！

推荐答案

使用Swift 4 / iOS 10.3，您可以选择以下方法之一来解决问题。

With Swift 4 / iOS 10.3, you can choose one of the following ways in order to solve your problem.

以下代码显示如何截取屏幕截图并将其保存在设备相册中：

The following code shows how to take a screenshot and save it in the device photo album:

import UIKit

class ViewController: UIViewController {

    /* ... */

    @IBAction func screenshot(_ sender: UIBarButtonItem) {
        //Create the UIImage
        UIGraphicsBeginImageContextWithOptions(view.frame.size, true, 0)
        guard let context = UIGraphicsGetCurrentContext() else { return }
        view.layer.render(in: context)
        guard let image = UIGraphicsGetImageFromCurrentImageContext() else { return }
        UIGraphicsEndImageContext()

        //Save it to the camera roll
        UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
    }

}

请注意，此代码的结果将是.JPG图像。另请注意，导航栏和状态栏不会出现在最终图像中。

Note that the result of this code will be a .JPG image. Also note that the navigation bar and the status bar will not appear in the final image.

从iOS 10开始，作为前一代码的替代，您可以使用代码下面：

Since iOS 10, as an alternative to the previous code, you can use the code below:

import UIKit

class ViewController: UIViewController {

    /* ... */

    @IBAction func screenshot(_ sender: UIBarButtonItem) {
        //Create the UIImage
        let renderer = UIGraphicsImageRenderer(size: view.frame.size)
        let image = renderer.image(actions: { context in
            view.layer.render(in: context.cgContext)
        })

        //Save it to the camera roll
        UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
    }

}

---

2。截取iPhone窗口的屏幕截图

如果要拍摄包含导航栏（但不包括状态栏）的屏幕截图，可以使用以下代码：

---

2. Take a screenshot of an iPhone window

If you want to take a screenshot that includes the navigation bar (but not the status bar), you can use the following code:

import UIKit

class ViewController: UIViewController {

    /* ... */

    @IBAction func screenshot(_ sender: UIBarButtonItem) {
        //Create the UIImage
        guard let layer = UIApplication.shared.keyWindow?.layer else { return }
        UIGraphicsBeginImageContextWithOptions(layer.frame.size, true, 0)
        guard let context = UIGraphicsGetCurrentContext() else { return }
        layer.render(in: context)
        guard let image = UIGraphicsGetImageFromCurrentImageContext() else { return }
        UIGraphicsEndImageContext()

        //Save it to the camera roll
        UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
    }

}

自iOS 10起，作为前一代码的替代，您可以使用以下代码：

Since iOS 10, as an alternative to the previous code, you can use the code below:

import UIKit

class ViewController: UIViewController {

    /* ... */

    @IBAction func screenshot(_ sender: UIBarButtonItem) {
        //Create the UIImage
        guard let layer = UIApplication.shared.keyWindow?.layer else { return }
        let renderer = UIGraphicsImageRenderer(size: layer.frame.size)
        let image = renderer.image(actions: { context in
            layer.render(in: context.cgContext)
        })

        //Save it to the camera roll
        UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
    }

}

---

提醒

自iOS 10起，为了防止您的应用在调用屏幕截图（_ :)时崩溃方法，你需要将密钥 NSPhotoLibraryUsageDescription 添加到你的项目中nfo.plist文件：

---

Reminder

Since iOS 10, in order to prevent your app from crashing when calling your screenshot(_:) method, you need to add the key NSPhotoLibraryUsageDescription to your project's Info.plist file:

<key>NSPhotoLibraryUsageDescription</key>
<string>Some description to explain why access is required</string>

这篇关于swift iOS中的屏幕截图？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！