将UIImage切成圆形 [英] Cut a UIImage into a circle

问题描述

我想将 UIImage 剪切成一个圆圈，以便我可以将其用作注释。我发现这个网站上的每个答案都描述了创建 UIImageView ，然后修改并显示它，但你不能将注释的图像设置为 UIImageView ，只有 UIImage 。
我应该怎么做？

I want to cut a UIImage into a circle so that I can then use it as an annotation. Every answer on this site that I've found describes creating an UIImageView, then modifying that and displaying it, but you cant set the image of an annotation to an UIImageView, only a UIImage. How should I go about this?

推荐答案

如果需要，请务必导入QuarzCore。

Make sure to import QuarzCore if needed.

 func maskRoundedImage(image: UIImage, radius: CGFloat) -> UIImage {
        let imageView: UIImageView = UIImageView(image: image)
        let layer = imageView.layer
        layer.masksToBounds = true
        layer.cornerRadius = radius
        UIGraphicsBeginImageContext(imageView.bounds.size)
        layer.render(in: UIGraphicsGetCurrentContext()!)
        let roundedImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return roundedImage!
    }

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