CODEWITHSUNDEEP
iphoneobjective-ccocoa-touch
user12345
user12345

Reputation: 2418

how to take a screenshot of the iPhone programmatically?

Is it possible in objective C that we can take the screen shot of screen and stored this image in UIImage.

Upvotes: 14

Views: 31444

Answers (11)

Alex Nazarov
Alex Nazarov

Reputation: 1218

In modern way:

Obj-C

@interface UIView (Snapshot)
- (UIImage * _Nullable)snapshot;
@end

@implementation UIView (Snapshot)

- (UIImage * _Nullable)snapshot {
    UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, UIScreen.mainScreen.scale);
    [self drawViewHierarchyInRect:self.bounds afterScreenUpdates:YES];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

@end

Swift

extension UIView {
    func snapshot() -> UIImage? {
        UIGraphicsBeginImageContextWithOptions(bounds.size, false, UIScreen.main.scale)
        drawHierarchy(in: bounds, afterScreenUpdates: true)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
   }
}

Upvotes: 0

user8098594
user8098594

Reputation:

// 100% Work

- (UIImage *)screenshot
{                   
  UIGraphicsBeginImageContextWithOptions(self.main_uiview.bounds.size, NO, 2.0f);
  [self.main_uiview drawViewHierarchyInRect:_main_uiview.bounds afterScreenUpdates:YES];

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

  return image;
}

Upvotes: 2

Ramani Hitesh
Ramani Hitesh

Reputation: 214

  • (UIImage *)screenshot { UIGraphicsBeginImageContextWithOptions(self.main_uiview.bounds.size, NO, 2.0f); [self.main_uiview drawViewHierarchyInRect:_main_uiview.bounds afterScreenUpdates:YES];

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

    return image; }

Upvotes: 0

dhaya
dhaya

Reputation: 1522

UIGraphicsBeginImageContext(self.window.bounds.size);
[self.window.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData * data = UIImagePNGRepresentation(image);
[data writeToFile:@"foo.png" atomically:YES];

UPDATE April 2011: for retina display, change the first line into this:

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

Upvotes: 2

Rahul Gupta
Rahul Gupta

Reputation: 808

try this... 

- (UIImage*)captureView:(UIView *)view 
{
    CGRect rect = [[UIScreen mainScreen] bounds];
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [view.layer renderInContext:context];
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;
}

- (void)saveScreenshotToPhotosAlbum:(UIView *)view 
{
    UIImageWriteToSavedPhotosAlbum([self captureView:self.view], nil, nil,nil);
}

Upvotes: 3

Madhur Sodhi
Madhur Sodhi

Reputation: 121

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

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

    NSData *data = UIImagePNGRepresentation(image);
    [data writeToFile:@"snapshot.png" options:NSDataWritingWithoutOverwriting error:Nil];
    [data writeToFile:@"snapshot.png" atomically:YES];

    UIImageWriteToSavedPhotosAlbum([UIImage imageWithData:data], nil, nil, nil);
}

Upvotes: 1

Nithinbemitk
Nithinbemitk

Reputation: 2720

Use this code to take the screenshot:

-(void)webViewDidFinishLoad:(UIWebView *)webView
{
UIGraphicsBeginImageContext(self.webView.bounds.size);

    [self.webView.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage *screenshotImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    UIImageWriteToSavedPhotosAlbum(screenshotImage, nil, nil, nil);

    NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];


    NSString *str1=[NSString stringWithFormat:@"%d",myInt];

    NSString *pngFilePath = [NSString stringWithFormat:@"%@/page_%@.png",docDir,str1]; // any name u want for image
    NSLog(@"%@",pngFilePath);
    NSData *data1 = [NSData dataWithData:UIImagePNGRepresentation(screenshotImage)]; 
    [data1 writeToFile:pngFilePath atomically:YES];
}

Upvotes: 0

Bill Garrison
Bill Garrison

Reputation: 2049

Technical Q&A QA1703 Screen Capture in UIKit Applications

http://developer.apple.com/iphone/library/qa/qa2010/qa1703.html

Upvotes: 7

Bill Garrison
Bill Garrison

Reputation: 2049

The previous code assumes that the view to be captured lives on the main screen...it might not.

Would this work to always capture the content of the main window? (warning: compiled in StackOverflow)


- (UIImage *) captureScreen {
    UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
    CGRect rect = [keyWindow bounds];
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [keyWindow.layer renderInContext:context];   
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;
}

Upvotes: 25

VdesmedT
VdesmedT

Reputation: 9113

You need to create a bitmap context of the size of your screen and use

[self.view.layer renderInContext:c]

to copy your view in it. Once this is done, you can use 

CGBitmapContextCreateImage(c)

to create a CGImage from your context.

Elaboration :

CGSize screenSize = [[UIScreen mainScreen] applicationFrame].size;
CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB(); 
CGContextRef ctx = CGBitmapContextCreate(nil, screenSize.width, screenSize.height, 8, 4*(int)screenSize.width, colorSpaceRef, kCGImageAlphaPremultipliedLast);
CGContextTranslateCTM(ctx, 0.0, screenSize.height);
CGContextScaleCTM(ctx, 1.0, -1.0);

[(CALayer*)self.view.layer renderInContext:ctx];

CGImageRef cgImage = CGBitmapContextCreateImage(ctx);
UIImage *image = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
CGContextRelease(ctx);  
[UIImageJPEGRepresentation(image, 1.0) writeToFile:@"screen.jpg" atomically:NO];

Note that if you run your code in response to a click on a UIButton, your image will shows that button pressed.

Upvotes: 17

MikeyWard
MikeyWard

Reputation: 1133

Yes, here's a link to the Apple Developer Forums https://devforums.apple.com/message/149553

Upvotes: -1

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