如何在iOS上以编程方式截取屏幕截图

时间：2010-02-04 15:14:50

标签： ios iphone screenshot

我想要保存在已保存照片库中的屏幕上的图像截图。

20 个答案:

答案 0 :(得分：231)

考虑检查视网膜显示器，请使用以下代码段：

#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");
}

答案 1 :(得分：45)

以下方法适用于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;
}

答案 2 :(得分：20)

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];

答案 3 :(得分：14)

- (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

答案 4 :(得分：10)

请参阅this帖子，看起来您现在可以使用UIGetScreenImage（）。

答案 5 :(得分：8)

IN SWIFT 

func captureScreen() -> UIImage
{

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

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

    let image: UIImage = UIGraphicsGetImageFromCurrentImageContext()

    UIGraphicsEndImageContext()

    return image
}

答案 6 :(得分：7)

从iOS10开始，这会变得更简单一些。 UIKit附带UIGraphicsImageRender，允许你

  

...完成绘图任务，无需处理颜色深度和图像比例等配置，或管理核心图形上下文

Apple Docs - UIGraphicsImageRenderer

所以你现在可以这样做：

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

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

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ARSCNView的快照时，我只能使用上述方法进行拍摄。虽然值得注意的是，目前ARKit尚处于测试阶段且Xcode处于测试阶段4

答案 7 :(得分：6)

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;
}

答案 8 :(得分：5)

我认为如果您想要全屏显示以下代码段（状态栏除外），只需在必要时将AppDelegate替换为您的应用代理名称。

- (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;
}

答案 9 :(得分：4)

我无法通过Swift 3实现找到答案。所以就这样了。

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
}

答案 10 :(得分：3)

适用于iOS 7.0或更高版本..

如果您想截取视图说明（myView），可以使用单行执行此操作：

[myView snapshotViewAfterScreenUpdates:NO];

答案 11 :(得分：2)

这将与 swift 4.2 一起使用，屏幕截图将保存在库中，但是请不要忘记编辑info.plist @ NSPhotoLibraryAddUsageDescription：

  @IBAction func takeScreenshot(_ sender: UIButton) {

    //Start full Screenshot
    print("full Screenshot")
    UIGraphicsBeginImageContext(card.frame.size)
    view.layer.render(in: UIGraphicsGetCurrentContext()!)
    var sourceImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    UIImageWriteToSavedPhotosAlbum(sourceImage!, nil, nil, nil)

    //Start partial Screenshot
    print("partial Screenshot")
    UIGraphicsBeginImageContext(card.frame.size)
    sourceImage?.draw(at: CGPoint(x:-25,y:-100)) //the screenshot starts at -25, -100
    var croppedImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    UIImageWriteToSavedPhotosAlbum(croppedImage!, nil, nil, nil)

}

答案 12 :(得分：2)

从视图获取屏幕截图：

- (UIImage *)takeSnapshotView {
    CGRect rect = [myView bounds];//Here you can change your view with myView
    UIGraphicsBeginImageContextWithOptions(rect.size,YES,0.0f);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [myView.layer renderInContext:context];
    UIImage *capturedScreen = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return capturedScreen;//capturedScreen is the image of your view
}

希望，这就是你要找的东西。任何关注都会回复给我。 ：）

答案 13 :(得分：2)

从视图中获取屏幕截图 

-(UIImage *)getScreenshotImage {
    if ([[UIScreen mainScreen] scale] == 2.0) {
        UIGraphicsBeginImageContextWithOptions(self.view.frame.size, FALSE, 2.0);
    } else {
        UIGraphicsBeginImageContextWithOptions(self.view.frame.size, FALSE, 1.0);
    }

    [self.view.window.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage * result = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return result;
}

将图片保存到照片 

UIImageWriteToSavedPhotosAlbum(YOUR_IMAGE, nil, nil, nil);

如何对 

UIImageWriteToSavedPhotosAlbum([self getScreenshotImage], nil, nil, nil);

答案 14 :(得分：1)

在Swift中，您可以使用以下代码。

if UIScreen.mainScreen().respondsToSelector(Selector("scale")) {
    UIGraphicsBeginImageContextWithOptions(self.window!.bounds.size, false, UIScreen.mainScreen().scale)
}
else{
    UIGraphicsBeginImageContext(self.window!.bounds.size)
}
self.window?.layer.renderInContext(UIGraphicsGetCurrentContext())
var image : UIImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)

答案 15 :(得分：1)

波纹管网站提供两种选择：

选项1：使用UIWindow（尝试并完美地工作）

// create graphics context with screen size
CGRect screenRect = [[UIScreen mainScreen] bounds];
UIGraphicsBeginImageContext(screenRect.size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
[[UIColor blackColor] set];
CGContextFillRect(ctx, screenRect);

// grab reference to our window
UIWindow *window = [UIApplication sharedApplication].keyWindow;

// transfer content into our context
[window.layer renderInContext:ctx];
UIImage *screengrab = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

选项2：使用UIView 

// grab reference to the view you'd like to capture
UIView *wholeScreen = self.splitViewController.view;

// define the size and grab a UIImage from it
UIGraphicsBeginImageContextWithOptions(wholeScreen.bounds.size, wholeScreen.opaque, 0.0);
[wholeScreen.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *screengrab = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

对于视网膜屏幕（如DenNukem回答）

// grab reference to our window
    UIWindow *window = [UIApplication sharedApplication].keyWindow;

    // create graphics context with screen size
    CGRect screenRect = [[UIScreen mainScreen] bounds];
    if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
        UIGraphicsBeginImageContextWithOptions(screenRect.size, NO, [UIScreen mainScreen].scale);
    } else {
        UIGraphicsBeginImageContext(screenRect.size);
        [window.layer renderInContext:UIGraphicsGetCurrentContext()];
    }

了解更多细节： OR operator

答案 16 :(得分：1)

只是一个小小的贡献，我用按钮做了这个，但按下也意味着按下了按钮。所以首先我不亮。

- (IBAction)screenShot:(id)sender {
    // Unpress screen shot button
    screenShotButton.highlighted = NO;

    // create graphics context with screen size
    CGRect screenRect = [[UIScreen mainScreen] bounds];

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

    CGContextRef ctx = UIGraphicsGetCurrentContext();
    [[UIColor blackColor] set];
    CGContextFillRect(ctx, screenRect);

    // grab reference to our window
    UIWindow *window = [UIApplication sharedApplication].keyWindow;

    // transfer content into our context
    [window.layer renderInContext:ctx];
    UIImage *screengrab = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    // save screengrab to Camera Roll
    UIImageWriteToSavedPhotosAlbum(screengrab, nil, nil, nil);
}

我得到了代码的主体： http://pinkstone.co.uk/how-to-take-a-screeshot-in-ios-programmatically/ 在我使用选项1的地方，选项2似乎对我不起作用。添加了此线程中Rentina屏幕尺寸的调整，以及screenShotButton的不突出显示。我正在使用它的视图是一个按钮和标签的StoryBoarded屏幕，稍后通过该程序添加了几个UIView。

答案 17 :(得分：1)

另一种选择是在仪器上使用自动化工具。你编写一个脚本将屏幕放入你想要的任何状态，然后拍摄。这是我用于其中一个应用程序的脚本。显然，脚本的详细信息将因您的应用而异。

var target = UIATarget.localTarget();
var app = target.frontMostApp();
var window = app.mainWindow();
var picker = window.pickers()[0];
var wheel = picker.wheels()[2];
var buttons = window.buttons();
var button1 = buttons.firstWithPredicate("name == 'dateButton1'");
var button2 = buttons.firstWithPredicate("name == 'dateButton2'");

function setYear(picker, year) {
    var yearName = year.toString();
    var yearWheel = picker.wheels()[2];
    yearWheel.selectValue(yearName);
}

function setMonth(picker, monthName) {
    var wheel = picker.wheels()[0];
    wheel.selectValue(monthName);
}

function setDay(picker, day) {
    var wheel = picker.wheels()[1];
    var name = day.toString();
    wheel.selectValue(name);
}

target.delay(1);
setYear(picker, 2015);
setMonth(picker, "July");
setDay(picker, 4);
button1.tap();
setYear(picker, 2015);
setMonth(picker, "December");
setDay(picker, 25);

target.captureScreenWithName("daysShot1");

var nButtons = buttons.length;
UIALogger.logMessage(nButtons + " buttons");
for (var i=0; i<nButtons; i++) {
    UIALogger.logMessage("button " + buttons[i].name());
}

var tabBar = window.tabBars()[0];
var barButtons = tabBar.buttons();

var nBarButtons = barButtons.length;
UIALogger.logMessage(nBarButtons + " buttons on tab bar");

for (var i=0; i<nBarButtons; i++) {
    UIALogger.logMessage("button " + barButtons[i].name());
}

var weeksButton = barButtons[1];
var monthsButton = barButtons[2];
var yearsButton = barButtons[3];

target.delay(2);
weeksButton.tap();
target.captureScreenWithName("daysShot2");
target.delay(2);
monthsButton.tap();
target.captureScreenWithName("daysShot3");
target.delay(2);
yearsButton.tap();
target.delay(2);
button2.tap();
target.delay(2);
setYear(picker, 2018);
target.delay(2);
target.captureScreenWithName("daysShot4");

答案 18 :(得分：0)

斯威夫特4：

func makeImage(withView view: UIView) -> UIImage? {

    let rect = view.bounds

    UIGraphicsBeginImageContextWithOptions(rect.size, true, 0)

    guard let context = UIGraphicsGetCurrentContext() else {
      assertionFailure()
      return nil
    }

    view.layer.render(in: context)

    guard let image = UIGraphicsGetImageFromCurrentImageContext() else {
      assertionFailure()
      return nil
    }

    UIGraphicsEndImageContext()

    return image
}

答案 19 :(得分：0)

我正在回答这个问题，因为它受到了高度重视，并且答案很多，还有Swift和Obj-C。

免责声明 这不是我的代码， 也不是我的答案， 这只是为了帮助住在这里的人快速找到回答。有指向原始答案的链接，可在应计积分的情况下给予功劳！ 如果使用其答案，请以+1表示感谢！

Using 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 

func captureScreen() -> UIImage
{

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

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

    let image: UIImage = UIGraphicsGetImageFromCurrentImageContext()

    UIGraphicsEndImageContext()

    return image
}

注意： 由于编程的本质， 可能需要进行更新，因此请编辑或让我知道！ *此外，如果我未能包含值得包括在内的答案/方法，请随时告诉我！

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