Capture iPhone screen - ios

Question

I am using following code to capture screen. Before it was working fine but now its retuning nil image.I am using iPhone 5,5c and 5s.
+ (UIImage *)screenshot
{
CGSize imageSize = CGSizeZero;
imageSize = [UIScreen mainScreen].bounds.size;
UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
CGContextRef context = UIGraphicsGetCurrentContext();
for (UIWindow *window in [[UIApplication sharedApplication] windows])
{
CGContextSaveGState(context);
CGContextTranslateCTM(context, window.center.x, window.center.y);
CGContextConcatCTM(context, window.transform);
CGContextTranslateCTM(context, -window.bounds.size.width * window.layer.anchorPoint.x, -window.bounds.size.height * window.layer.anchorPoint.y);
if ([window respondsToSelector:#selector(drawViewHierarchyInRect:afterScreenUpdates:)])
{
[window drawViewHierarchyInRect:window.bounds afterScreenUpdates:YES];
}
else
{
[window.layer renderInContext:context];
}
CGContextRestoreGState(context);
}
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}

Answer 1

Now I am using this code and its working good.
+ (UIImage *)screenshot:(UIView *)view
{
CGRect screenRect = [[UIScreen mainScreen] bounds];
UIGraphicsBeginImageContextWithOptions(screenRect.size, NO, 0.0);
CGContextRef ctx = UIGraphicsGetCurrentContext();
[[UIColor blackColor] set];
CGContextFillRect(ctx, screenRect);
[view.layer renderInContext:ctx];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}

Answer 2

Here is a method that I use to capture a UIView into a UIImage.
+ (UIImage *)renderView:(UIView *)view toImageWithSize:(CGSize)size {
UIGraphicsBeginImageContextWithOptions(size, NO, 0.);
CGContextRef c = UIGraphicsGetCurrentContext();
[view.layer renderInContext:c];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return viewImage;
}
And then you can have your screenshot method that uses the method above to render the rootViewController of the main window into an image:
+ (UIImage *)screenshot {
UIWindow *mainWindow = [UIApplication sharedApplication].windows.firstObject;
UIView *mainView = mainWindow.rootViewController.view;
return [self renderView:mainView toImageWithSize:mainView.bounds.size];
}
I hope this is helpful.

Answer 3

Well, this piece of code works for me. This code capture a screenshot of the view (self.view here) and all its subviews. Means, in one word, screenshot of the screen.
+ (UIImage *)screenshot {
CGRectMake *captureFrame = [[UIScreen mainScreen] bounds]; //The portion and size of the area, you want to capture. I have set it to the size of window
CALayer *layer;
layer = self.view.layer;
UIGraphicsBeginImageContext(self.view.bounds.size);
CGContextClipToRect (UIGraphicsGetCurrentContext(),captureFrame);
[layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *screenImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return screenImage;
}
Hope this helps.