iOS UIImage from UIView , Images from View , JPG from UIView , UIImage from Scrollview

gistfile1.m

//extract from class ObCommons, hence the calls to this class are named so

+(UIImage*) createImageFromView:(UIView*)newt withRect:(CGSize)rensize {
       

    UIGraphicsBeginImageContextWithOptions(rensize,NO,[ObCommons retinaFactor]);
    
    [newt.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *ximage = UIGraphicsGetImageFromCurrentImageContext();
    
    UIGraphicsEndImageContext();

    
    return ximage;
    
}

+(UIImage*) createJPEGfromView:(UIView*)newt withRect:(CGSize)rensize toPath:(NSString*)filePath {
    return     [ObCommons createJPEGfromView:newt withRect:rensize toPath:filePath quality:1.0];
}

+(UIImage*) createJPEGfromView:(UIView*)newt withRect:(CGSize)rensize toPath:(NSString*)filePath quality:(float)quality{
    
    UIImage *ximage = [ObCommons createImageFromView:newt withRect:rensize];    
    NSData *imageData = UIImageJPEGRepresentation(ximage, quality);
    
    if (filePath!=nil) {
        [imageData writeToFile:filePath atomically:YES];
    }
    return ximage;
    
}

+(UIImage*) createImageFromScrollView:(UIScrollView*)_scrollView
{
    UIImage* image = nil;
    
    UIGraphicsBeginImageContext(_scrollView.contentSize);
    {
        CGPoint savedContentOffset = _scrollView.contentOffset;
        CGRect savedFrame = _scrollView.frame;
        
        _scrollView.contentOffset = CGPointZero;
        _scrollView.frame = CGRectMake(0, 0, _scrollView.contentSize.width, _scrollView.contentSize.height);
        
        [_scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];
        image = UIGraphicsGetImageFromCurrentImageContext();
        
        _scrollView.contentOffset = savedContentOffset;
        _scrollView.frame = savedFrame;
    }
    UIGraphicsEndImageContext();
    
    return image;
 
}

+(UIImage*) createPNGfromImage:(UIImage*)source forPath:(NSString*)targetPath {
    if (source != nil) {
        [UIImagePNGRepresentation(source) writeToFile: targetPath atomically: YES];
    }
    return  source;
}

+(UIImage*) createJPEGforImage:(UIImage*)source forPath:(NSString*)targetPath quality:(float)quality{
    if (source != nil) {
        [UIImageJPEGRepresentation(source,quality) writeToFile: targetPath atomically: YES];
    }
    return  source;
}

+(CGFloat)retinaFactor {
    if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)] && [[UIScreen mainScreen] scale] > 1){
        return [[UIScreen mainScreen]scale];
    } else {
        return 1.0f;
    }
}