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!