taking a screenshot of a UIView in iOS

Question

I'm running iOS 4.3 & trying to take a screenshot of a UIView which is playing a movie. The problem is that the screenshot (in the simulator) turns out to be simply a black background & not the movie image i was hoping for. My code is below, any ideas what the matter might be? thanks in advance :)

- (void) takeScreenshot; { UIGraphicsBeginImageContextWithOptions(self.frame.size, NO, 0.0); [self.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); UIImageView *movieImage = [[UIImageView alloc] initWithImage:screenshot]; [self addSubview:movieImage]; }

I am not sure, but your problem may be in [self.layer renderInContext:UIGraphicsGetCurrentContext()]; because you taking the screenshot of the self.layer instead of your movieplayer view. — 0xDE4E15B
– 0xDE4E15B, Commented Feb 26, 2012 at 23:14
I expect that the movie view is using an OpenGL layer to draw its video, so this won't work. — joerick
– joerick, Commented Feb 27, 2012 at 10:24

Octave1 · Accepted Answer · 2012-02-28 12:10:46Z

I eventually found a solution to this issue - as joerick mentioned above one can't take a screenshot (using renderInContext) as the movie is using an OpenGL layer to draw its video.

However there is a way to take a thumbnail of a movie (shown below for the current playback time):

UIImage *image = [moviePlayer thumbnailImageAtTime:moviePlayer.currentPlaybackTime timeOption:MPMovieTimeOptionNearestKeyFrame];

Hope this helps someone out :)

so no way to take the actual screenshot? I have very limited knowledge of OpenGL but Apple Doc has some code to take screenshot. I am not able get this code compiled for me.

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