Bars not showing when saving Bar Chart view

Question

My chart shows up fine in my app, but when I save the chartView to camera roll or for use in another UIViewController the bars don't show up.

Fine in my app:

Bars don't show up when save the chartView to camera roll or for use in another UIViewController:

I've tried a few ways of doing this -specifically for saving the chartView to Camera Roll- like:

1)

    let image1 = chartView.getChartImage(transparent: false)
    UIImageWriteToSavedPhotosAlbum(image1!, nil, nil, nil)

2)

    let image2 = captureScreen()
    UIImageWriteToSavedPhotosAlbum(image2!, nil, nil, nil)

3)

extension UIImage {
    convenience init(view: UIView) {
        UIGraphicsBeginImageContext(view.frame.size)
        view.layer.render(in: UIGraphicsGetCurrentContext()!)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        self.init(cgImage: (image?.cgImage)!)
    }
}

    let image3 = UIImage(view: chartView)
    UIImageWriteToSavedPhotosAlbum(image3, nil, nil, nil)

But nothing works for me. Any ideas why? Thanks!

Zohaib · Accepted Answer · 2017-07-04 10:24:39Z

1

I had the same issue when capturing image using getChartImage. So I made my own function for capturing Image.

Basically I make a UIView class and inherited LineChartView. Made UIView extension for taking snapShot of my chartView.

Implement this function in UIView extension:

func snapShot() -> UIImage? {
        UIGraphicsBeginImageContextWithOptions(self.frame.size , false, UIScreen.main.scale)
        self.layer.render(in: UIGraphicsGetCurrentContext()!)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        return image
    }

And call it like this

let image = chartView.snapShot()

Hope this helps!!!

answered Jul 4, 2017 at 10:24

Zohaib

2,8652 gold badges27 silver badges33 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

SRMR Over a year ago

Thanks for the response! Glad to know someone else was having trouble with the same thing and figured it out. I think I understand that you put the snapshot() function inside of extension UIView {...}, but wondering what is in the UIView class and inherited LineChartView"?

Zohaib Over a year ago

I did not make ViewController and inherit LineChartView. rather then I made a class and inherited LineChartView. So the chart is a view for me. so thats why I made UIView extension. Is it clear?

SRMR Over a year ago

Ah, got it! Makes sense. Thanks I got this all working now!

Collectives™ on Stack Overflow

Bars not showing when saving Bar Chart view

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related