如何在 iOS 上以编程方式截取屏幕截图

How to take a screenshot programmatically on iOS

提问by Jab

I want a screenshot of the image on the screen saved into the saved photo library.

我想要保存到保存的照片库中的屏幕上的图像的屏幕截图。

采纳答案by Jab

I'm answering this question as it's a highly viewed, and there are many answers out there plus there's Swift and Obj-C.

我正在回答这个问题，因为它受到高度评价，并且有很多答案，还有 Swift 和 Obj-C。

DisclaimerThis is not my code,nor my answers,this is only to help people that land here find a quick answer. There are links to the original answers to give credit where credit is due!!Please honor the original answers with a +1 if you use their answer!

免责声明这不是我的代码，也不是我的答案，这只是为了帮助登陆这里的人快速找到答案。有原始答案的链接可以在信用到期时给予信用！！如果您使用他们的答案，请以 +1 尊重原始答案！

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Using QuartzCore

使用 QuartzCore

#import <QuartzCore/QuartzCore.h> 

if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
    UIGraphicsBeginImageContextWithOptions(self.window.bounds.size, NO, [UIScreen mainScreen].scale);
} else {
    UIGraphicsBeginImageContext(self.window.bounds.size);
}

[self.window.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *imageData = UIImagePNGRepresentation(image);
if (imageData) {
    [imageData writeToFile:@"screenshot.png" atomically:YES];
} else {
    NSLog(@"error while taking screenshot");
}

---

---

In Swift

在斯威夫特

func captureScreen() -> UIImage
{

    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, false, 0);

    self.view.drawViewHierarchyInRect(view.bounds, afterScreenUpdates: true)

    let image: UIImage = UIGraphicsGetImageFromCurrentImageContext()

    UIGraphicsEndImageContext()

    return image
}

Note:As the nature with programming,updates may need to be done so please edit or let me know!*Also if I failed to include an answer/method worth including feel free to let me know as well!

注意：由于编程的性质，可能需要进行更新，因此请编辑或让我知道！*此外，如果我没有包含值得包含的答案/方法，也请随时让我知道！

回答by DenNukem

Considering a check for retina displayuse the following code snippet:

考虑检查视网膜显示，请使用以下代码片段：

#import <QuartzCore/QuartzCore.h> 

if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
    UIGraphicsBeginImageContextWithOptions(self.window.bounds.size, NO, [UIScreen mainScreen].scale);
} else {
    UIGraphicsBeginImageContext(self.window.bounds.size);
}

[self.window.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *imageData = UIImagePNGRepresentation(image);
if (imageData) {
    [imageData writeToFile:@"screenshot.png" atomically:YES];
} else {
    NSLog(@"error while taking screenshot");
}

回答by Mann

Below method works for OPENGL objects also

下面的方法也适用于 OPENGL 对象

//iOS7 or above
- (UIImage *) screenshot {

    CGSize size = CGSizeMake(your_width, your_height);

    UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale);

    CGRect rec = CGRectMake(0, 0, your_width, your_height);
    [_viewController.view drawViewHierarchyInRect:rec afterScreenUpdates:YES];

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

回答by IOS Rocks

UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, self.view.opaque, 0.0);
[self.myView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

NSData *imageData = UIImageJPEGRepresentation(image, 1.0 ); //you can use PNG too
[imageData writeToFile:@"image1.jpeg" atomically:YES];

回答by Aistina

- (UIImage*) getGLScreenshot {
    NSInteger myDataLength = 320 * 480 * 4;

    // allocate array and read pixels into it.
    GLubyte *buffer = (GLubyte *) malloc(myDataLength);
    glReadPixels(0, 0, 320, 480, GL_RGBA, GL_UNSIGNED_BYTE, buffer);

    // gl renders "upside down" so swap top to bottom into new array.
    // there's gotta be a better way, but this works.
    GLubyte *buffer2 = (GLubyte *) malloc(myDataLength);
    for(int y = 0; y <480; y++)
    {
        for(int x = 0; x <320 * 4; x++)
        {
            buffer2[(479 - y) * 320 * 4 + x] = buffer[y * 4 * 320 + x];
        }
    }

    // make data provider with data.
    CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, buffer2, myDataLength, NULL);

    // prep the ingredients
    int bitsPerComponent = 8;
    int bitsPerPixel = 32;
    int bytesPerRow = 4 * 320;
    CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
    CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault;
    CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;

    // make the cgimage
    CGImageRef imageRef = CGImageCreate(320, 480, bitsPerComponent, bitsPerPixel, bytesPerRow, colorSpaceRef, bitmapInfo, provider, NULL, NO, renderingIntent);

    // then make the uiimage from that
    UIImage *myImage = [UIImage imageWithCGImage:imageRef];
    return myImage;
}

- (void)saveGLScreenshotToPhotosAlbum {
    UIImageWriteToSavedPhotosAlbum([self getGLScreenshot], nil, nil, nil);  
}

Source.

来源。

回答by Vicky

IN SWIFT

迅速

func captureScreen() -> UIImage
{

    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, false, 0);

    self.view.drawViewHierarchyInRect(view.bounds, afterScreenUpdates: true)

    let image: UIImage = UIGraphicsGetImageFromCurrentImageContext()

    UIGraphicsEndImageContext()

    return image
}

回答by Hua-Ying

See thispost it looks like you can use UIGetScreenImage() for now.

看到这篇文章，你现在可以使用 UIGetScreenImage() 了。

回答by Tulio Troncoso

As of iOS10, this gets a bit simpler. UIKit comes with UIGraphicsImageRenderthat allows you to

从 iOS10 开始，这变得更简单了。UIKit 附带的UIGraphicsImageRender允许您

... accomplish drawing tasks, without having to handle configuration such as color depth and image scale, or manage Core Graphics contexts

... 完成绘图任务，无需处理颜色深度和图像比例等配置，或管理 Core Graphics 上下文

Apple Docs - UIGraphicsImageRenderer

Apple 文档 - UIGraphicsImageRenderer

So you can now do something like this:

所以你现在可以做这样的事情：

let renderer = UIGraphicsImageRenderer(size: someView.bounds.size)

let image = renderer.image(actions: { context in
    someView.drawHierarchy(in: someView.bounds, afterScreenUpdates: true)
})

Many of the answers here worked for me in most cases. But when trying to take a snapshot of an ARSCNView, I was only able to do it using the method described above. Although it might be worth noting that at this time, ARKit is still in beta and Xcode is in beta 4

在大多数情况下，这里的许多答案对我有用。但是在尝试拍摄 的快照时ARSCNView，我只能使用上述方法来完成。尽管可能值得注意的是，此时 ARKit 仍处于测试阶段，而 Xcode 处于测试阶段 4

回答by A. Adam

This will save a screenshot and as well return the screenshot too.

这将保存屏幕截图并返回屏幕截图。

-(UIImage *)capture{
    UIGraphicsBeginImageContext(self.view.bounds.size);
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *imageView = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    UIImageWriteToSavedPhotosAlbum(imageView, nil, nil, nil); //if you need to save
    return imageView;
}

回答by tounaobun

I think the following snippet would help if you want to take a full screen(except for status bar),just replace AppDelegate with your app delegate name if necessary.

我认为如果您想全屏显示（状态栏除外），以下代码段会有所帮助，如有必要，只需将 AppDelegate 替换为您的应用程序委托名称。

- (UIImage *)captureFullScreen {

    AppDelegate *_appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;

    if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
        // for retina-display
        UIGraphicsBeginImageContextWithOptions(_appDelegate.window.bounds.size, NO, [UIScreen mainScreen].scale);
        [_appDelegate.window drawViewHierarchyInRect:_appDelegate.window.bounds afterScreenUpdates:NO];
    } else {
        // non-retina-display
        UIGraphicsBeginImageContext(_bodyView.bounds.size);
        [_appDelegate.window drawViewHierarchyInRect:_appDelegate.window.bounds afterScreenUpdates:NO];
    }

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

回答by jarora

I couldn't find an answer with Swift 3 implementation. So here it goes.

我找不到 Swift 3 实现的答案。所以就到这里了。

static func screenshotOf(window: UIWindow) -> UIImage? {

    UIGraphicsBeginImageContextWithOptions(window.bounds.size, true, UIScreen.main.scale)

    guard let currentContext = UIGraphicsGetCurrentContext() else {
        return nil
    }

    window.layer.render(in: currentContext)
    guard let image = UIGraphicsGetImageFromCurrentImageContext() else {
        UIGraphicsEndImageContext()
        return nil
    }

    UIGraphicsEndImageContext()
    return image
}