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

问题描述

如何通过代码(在 Swift 中)从我的屏幕上截取屏幕截图并保存它?我可以截图并保存为图像吗?

How can I take screenshot from my screen by code (in Swift) and save it? Can I take screenshot and save it as image?

我查看并看到了这段代码，但我无法使用它(我认为)，因为它没有任何作用.

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.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)

推荐答案

在 Swift 4/iOS 10.3 中，您可以选择以下方式之一来解决您的问题.

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

以下代码展示了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.还要注意导航栏和状态栏将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，作为之前代码的替代，您可以使用下面的代码:

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
        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

如果要截取包含导航栏(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)
    }
 
}

从 iOS 10 开始，作为之前代码的替代，您可以使用下面的代码:

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

从 iOS 10 开始，为了防止您的应用在调用您的 screenshot(_:) 方法时崩溃，您需要将密钥 NSPhotoLibraryUsageDescription 添加到您的项目的信息中.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！