Is there a way to specify the image format when using UIActivityViewController on a UIImage?

Question

It seems that the OS chooses whether to use a PNG or JPEG for reasons unknown. In my case, I want a JPEG sent (via mail, twitter, etc.) but I tend to get a very large PNG.

If I subclass UIActivityItemProvider and return an NSURL pointing to a file that I created myself by writing a JPEG to disk using UIImageJPEGRepresentation, I can of course get a JPEG. However using an NSURL causes other issues (one of them being the inability to use iMessage as a target). Is there any way to use a UIImage, but specify that you would prefer a certain file format? (I'm quite sure the answer is NO, but want to check.)

score 10 · Answer 1 · answered Jun 26 '13 at 11:17

10

Actually it just worked to pass in the NSData of the JPEG representation as the activity item.

NSData *data = UIImageJPEGRepresentation(image, 0.6);
UIActivityViewController *activityController = [[UIActivityViewController alloc] initWithActivityItems:@[data]];
                                                                                 applicationActivities:nil];

answered Jun 26 '13 at 11:17

stigi

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good one, saved a lot of time. :) In my case I wanted to keep the images PNG but they were being converted to JPG while sharing so I sent the PNG data here :) +1 – Ahsan Ebrahim Khatri Mar 09 '16 at 11:26

score -5 · Accepted Answer · answered Jan 16 '13 at 12:28

-5

Looks like the answer is indeed NO.

answered Jan 16 '13 at 12:28

akaru

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Did you find confirmation for this? – stigi Jun 26 '13 at 11:03

Is there a way to specify the image format when using UIActivityViewController on a UIImage?

2 Answers2