Draw text onto image at an angle [Swift 3] - ios

Question

I'm trying to make function that will take text from a textfield (textField) and draw it onto an image. The function at the moment can only change the drawing's coordinates x and y, and width and height. What I was wondering is how I can make the text be drawn at an angle (eg 45˚, 18˚, etc...)
Thanks in advance.
func drawText() {
let font = UIFont.boldSystemFont(ofSize: 30)
let showText:NSString = textField.text as! NSString
// setting attr: font name, color...etc.
let attr = [NSFontAttributeName: font, NSForegroundColorAttributeName:UIColor.white]
// getting size
let sizeOfText = showText.size(attributes: attr)
let image = UIImage(named: "image")!
let rect = CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height)
UIGraphicsBeginImageContextWithOptions(CGSize(width: rect.size.width, height: rect.size.height), true, 0)
// drawing our image to the graphics context
image.draw(in: rect)
// drawing text
showText.draw(in: CGRect(x: rect.size.width-sizeOfText.width-10, y: rect.size.height-sizeOfText.height-10, width: rect.size.width, height: rect.size.height), withAttributes: attr)
// getting an image from it
let newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext()
self.imageView.image = newImage
}

Answer 1

1.Draw text to an image first, then rotate the image.
2.Draw rotated image(with text) onto the background image.
//First create the rotated and transparent image with text
UIGraphicsBeginImageContextWithOptions(CGSize(width: rect.size.width, height: rect.size.height), false, 0)
if let context = UIGraphicsGetCurrentContext() {
context.rotate (by: 45.0 * CGFloat.pi/180.0) //45˚
}
showText.draw(in: CGRect(x: 10, y: 10, width: rect.size.width, height: rect.size.height), withAttributes: attr)
let rotatedImageWithText = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext()
//Then, draw rotated image(with text) onto the background image
UIGraphicsBeginImageContextWithOptions(CGSize(width: rect.size.width, height: rect.size.height), true, 0)
image.draw(in: rect)
rotatedImageWithText?.draw(in: rect)
let newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext()
self.imageView.image = newImage