捕获iPhone中的屏幕截图？

Question

I want to take screenshot programatically. So that i write code for it like,

CGContextRef context = [self createBitmapContextOfSize:self.frame.size];

//not sure why this is necessary...image renders upside-down and mirrored
CGAffineTransform flipVertical = CGAffineTransformMake(1, 0, 0, -1, 0, self.frame.size.height);
CGContextConcatCTM(context, flipVertical);

[self.layer renderInContext:context];

CGImageRef cgImage = CGBitmapContextCreateImage(context);
UIImage* background = [UIImage imageWithCGImage: cgImage];
CGImageRelease(cgImage);


self.currentScreen = background;

Here all code is in custom UIView of UIViewController. Now when i play UIImageView png sequence animation on UIView, then i didn't get updated changes in UIImageView which is subview of custom UIView, why? I got only result is UIImageView with first UIImage.

Basically i need to create an video of my game play like talking tom application.

Answer 1

Following code is use for the capture the image into the iPhone for that following code to be use.

 CGRect rect = CGRectMake(0.0, 0.0,self.view.frame.size.width,self.view.frame.size.height-44);
    NSValue *rectObj = [NSValue valueWithCGRect:rect];

    CGRect rectRestored = [rectObj CGRectValue];

    UIGraphicsBeginImageContext(CGSizeMake(rectRestored.size.width, rectRestored.size.height-44));
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    viewImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

Also store the image into the gallery.

Answer 2

您可能应该看看AVFoundation，尤其是AVAssetWriter ，它是一种创建屏幕内容视频的方法。

Answer 3

Take the screenshot of your ImageView with something like this:

[[[yourImageView layer] presentationLayer] renderInContext:context];

Use NSTimer for calling that getScreenshot function.

Hope this helps