How to take a screenshot programmatically on iOS

Question

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

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Get Screenshot From View  - 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      Save Image to Photos  UIImageWriteToSavedPhotosAlbum YOUR IMAGE  nil  nil  nil     How-To  UIImageWriteToSavedPhotosAlbum  self getScreenshotImage   nil  nil  nil

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See this post  it looks like you can use UIGetScreenImage   for now

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Considering a check for retina display use the following code snippet    import  lt QuartzCore QuartzCore h gt    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

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IN SWIFT  func captureScreen   - gt  UIImage        UIGraphicsBeginImageContextWithOptions self view bounds size  false  0        self view drawViewHierarchyInRect view bounds  afterScreenUpdates  true       let image  UIImage   UIGraphicsGetImageFromCurrentImageContext        UIGraphicsEndImageContext        return image

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Another option is to use the Automation tool on instruments   You write a script to put the screen into whatever you state you want  then take the shots   Here is the script I used for one of my apps   Obviously  the details of the script will be different for your app   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 lt 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 lt 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

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I couldn t find an answer with Swift 3 implementation  So here it goes   static func screenshotOf window  UIWindow  - gt  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

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Just a small contribution  I ve done this with a button but the pressing also means the button is captured pressed    So first I unhighlight   -  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       I got the main body of the code from  http   pinkstone co uk how-to-take-a-screeshot-in-ios-programmatically  where I used option 1  option 2 didn t seem to work for me    Added the adjustments for Rentina screen sizes from this thread  and the unhighlighting of the screenShotButton    The view I m using it on is a StoryBoarded screen of buttons and labels and with several UIView added later via the program

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As of iOS10  this gets a bit simpler  UIKit comes with UIGraphicsImageRender that allows you to          accomplish drawing tasks  without having to handle configuration such as color depth and image scale  or manage Core Graphics contexts   Apple Docs - UIGraphicsImageRenderer  So you can now do something like this   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

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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   Disclaimer This 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     Using QuartzCore   import  lt QuartzCore QuartzCore h gt    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   - gt  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

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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   -  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

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Swift 4    func makeImage withView view  UIView  - gt  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

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

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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

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-  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  lt 480  y                  for int x   0  x  lt 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

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In Swift you can use following code   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

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Get Screenshot From View    -  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     Hope  this is what you re looking for  Any concern get back to me

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Two options available at bellow site    OPTION 1  using UIWindow  tried and work perfectly      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      OPTION 2  using 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      For retina screen  as DenNukem answer      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             for more detail   http   pinkstone co uk how-to-take-a-screeshot-in-ios-programmatically

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This will work with swift 4 2  the screenshot will be saved in library  but please don t forget to edit the 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

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For iOS 7 0 or above    If you want to take screenshots of view say myView   you can do this with single line    myView snapshotViewAfterScreenUpdates NO

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Below method works for OPENGL objects also    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

[ios] How to take a screenshot programmatically on iOS

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