Keep transparency in screenshot iOS

Question

I am taking screenshot of a particular View in my Xib file with the following code...

UIView* captureView = self.view;
UIGraphicsBeginImageContextWithOptions(captureView.bounds.size, NO , 0.0f);
[captureView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage * screenshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

It works fine and saves JPG image to camera roll.

But problem is, There is another UIImageView on the top of my View, that UIImageView has a semi-transparent image in it. My screenshot doesn't preserve that transparency in the screenshot it is taking. I want to keep the transparency as it is in the actual screen.

How can you preserve the transparency in the screenshot?

Please see this link... You'll see an overlay of apple image , this the image which transparency is lost..http://stackoverflow.com/questions/20298887/take-screenshot-of-a-uiimage-ios — ayon, Dec 02 '13 at 08:16
The answers to this one that involve iterating through all views are a good place to start: http://stackoverflow.com/questions/14016010/creating-retina-screenshot-programmatically-resulting-in-non-retina-image — Daniel Randall, Apr 22 '15 at 13:37

score 3 · Answer 1 · answered Nov 30 '13 at 12:20

3

If you specify "No" for the opaque property, your image must include an alpha channel for this to work. Check that your image has an alpha channel.

answered Nov 30 '13 at 12:20

GuybrushThreepwood

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Can you illustrate how to add an alpha channel? Or help with the code. – Ankit Kumar Gupta Sep 28 '18 at 06:39

score 2 · Answer 2 · answered Nov 30 '13 at 12:30

2

JPGs don't have transparency so as soon as you convert it to JPG alpha is gone. This is a known limitation of UIImageWriteToSavedPhotosAlbum

it doesn't keep png.

answered Nov 30 '13 at 12:30

Daij-Djan

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Muruganandham K · Answer 3 · 2013-12-02T08:51:29.380

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try this. this code working for me

  UIGraphicsBeginImageContext(baseViewOne.frame.size);
            [[baseViewOne layer] renderInContext:UIGraphicsGetCurrentContext()];
            UIImage * screenshota = UIGraphicsGetImageFromCurrentImageContext();
            UIGraphicsEndImageContext();

also check cocoa coder screen shots

edited Dec 02 '13 at 08:51

answered Dec 02 '13 at 08:11

Muruganandham K

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score 0 · Answer 4 · edited Jun 02 '14 at 08:08

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NSData* imdata = UIImagePNGRepresentation(_snapshotImgView.image);
UIImage* snapshotPNG = [UIImage imageWithData:imdata];

UIImageWriteToSavedPhotosAlbum(snapshotPNG, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

edited Jun 02 '14 at 08:08

inf3rno

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answered Jun 02 '14 at 07:38

Saro Bear

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Keep transparency in screenshot iOS

4 Answers4