Swift：向图像添加文本不起作用

Question

I'm trying to edit an image by adding text to it, but the code I got from this post does not work: How to write text on image in Objective-C (iOS)?

My image-editing code looks like this:

func addTextToImage(image:UIImage, text:NSString, pointof: CGPoint) -> UIImage{

    let font:UIFont = UIFont.boldSystemFontOfSize(12)

    let dict:NSDictionary = [NSFontAttributeName : font]

    UIGraphicsBeginImageContext(image.size)
    image.drawInRect(CGRectMake(0, 0, image.size.width, image.size.height))
    let rect: CGRect = CGRectMake(pointof.x, pointof.y, image.size.width, image.size.height)
    let color: UIColor = UIColor.whiteColor()
    text.drawInRect(CGRectIntegral(rect), withAttributes:dict)

    let newImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    return newImage
}

And then I use the textViewDidChange method to add the text to the image, but it does not work:

func textViewDidChange(textView: UITextView){
    backgroundImage.image = addTextToImage(imageToView, text: textViewer.text, pointof: CGPointMake(0, 0))
}

Any suggestions on what I'm doing wrong would be appreciated.

Answer 1

func addTextToImage(drawText text: NSString, inImage image: UIImage, atPoint point: CGPoint) -> UIImage
{
    let textColor = UIColor.blue

    let textFont = UIFont(name: "ChalkboardSE-Regular", size: 26)!

    let scale = UIScreen.main.scale
    UIGraphicsBeginImageContextWithOptions(image.size, false, scale)

    let textFontAttributes = [
        NSFontAttributeName: textFont,
        NSForegroundColorAttributeName: textColor,
        ] as [String : Any]

    image.draw(in: CGRect(origin: CGPoint.zero, size: image.size))

    let rect = CGRect(origin: point, size: image.size)
    text.draw(in: rect, withAttributes: textFontAttributes)

    let newImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    return newImage!
}