延时捕获帧-iPhone相机

Question

I'm trying to write some objective-c code that allows capture of frames through the iPhone camera, after a specific time delay. Any examples I have found online have captured the 'present' frame input by the camera (ie a realtime frame capture). I am looking for a less real time frame capture - a way to capture frames with a specific time delay. Any ideas?

Answer 1

I would use NSTimer . It would allow you to use the code that captures the current frame, and it would get called after a delay.

You can create a non-repeating timer like this: timer = [NSTimer scheduledTimerWithTimerInterval:delay target:self selector:@selector(capture) userInfo:nil repeats:NO]; where delay is the specific time delay and capture is a method that contains the code from an example that captures the present frame.

Answer 2

Use following code.....

//call method according to your delay that you need.....

    float yourdelay;
    yourdelay = 0.7;
    [self performSelector:@selector(captureView) withObject:nil afterDelay:yourdelay];

// or set time for calling method....

[NSTimer scheduledTimerWithTimeInterval:0.02 target: self selector:@selector(captureView) userInfo:nil repeats:NO];

///or you can call method directly when you need..

[self captureView];

////Here the code for capture real time image.

- (void)captureView {

UIGraphicsBeginImageContext(mapView.frame.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
flickerImaveView.image=viewImage;    
}

Hope this will help you....