Take a screenshot of a given view and optionally crop it.

ScreenCapture.m

+(UIImage*)TakeScreenshotOfView:(UIView*)view Cropping:(CGRect)dimensions
{
    CGFloat scale = 1.0f;
    
    if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)])
        scale = [[UIScreen mainScreen] scale];
    
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO, scale);

    [view.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage *fullImage = UIGraphicsGetImageFromCurrentImageContext();
                
    CGRect rect = CGRectMake(dimensions.origin.x ,  dimensions.origin.y  * scale , dimensions.size.width * scale, dimensions.size.height * scale);
    CGImageRef croppedImageRef = CGImageCreateWithImageInRect([fullImage CGImage], rect);
    UIGraphicsEndImageContext();
    
    UIImage *croppedImage = [UIImage imageWithCGImage:croppedImageRef];
    return croppedImage;
    
}