参数标签与任何可用的重载swift都不匹配

Question

我有一个功能，在图像上绘制文字，但问题是，当我调用此函数时，它给出一个错误“参数标签'（_：，_ :)'不匹配任何可用的重载”我是swift的新手，不知道如何固定

func write_text_on_image(drawtext text:NSString , inimage img : UIImage , atpoint point : CGPoint) -> UIImage {

        let textcolor = UIColor.white
        let font = UIFont(name: "Helvetica", size: 16)

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

        let font_attributes = [

            kCTFontAttributeName : font,
            kCTForegroundColorAttributeName : textcolor
        ]

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

        let rect = CGRect(origin: point, size: img.size)

        text.draw(in: rect, withAttributes: font_attributes as [NSAttributedString.Key : Any])

        let newimg = UIGraphicsGetImageFromCurrentImageContext()

        UIGraphicsEndPDFContext()

        return newimg!

    }

我称这个功能为

write_text_on_image(drawtext: "THis is some text", inimage: UIImage(named: "test.png")!, atpoint: CGPoint(20,20))[!

check out screen of function []1

Answer 1

正如@vadian所说，代码完成会对你有所帮助。这是我在Playground中复制片段所得到的：

func write_text_on_image(drawtext text:NSString , inimage img : UIImage , atpoint point : CGPoint) -> UIImage { return UIImage() }

write_text_on_image(drawtext: "NSString", inimage: UIImage(), atpoint: CGPoint(x: 0, y: 0))

什么都不做，但是编译。

Answer 2

CGPoint（x，y）将参数传递为CGPoint（x：value，y; value）