[求助] 在绘制圆角图片时碰到个问题，某些颜色下会出现圆角不光滑的情形

代码

 extension UIImage { func thumbnails(with options: SomeDrawingOptions) -> UIImage? { // ... UIGraphicsBeginImageContextWithOptions(targetRect.size, false, 0) defer { UIGraphicsEndImageContext() } let cOntext= UIGraphicsGetCurrentContext()! UIColor.white.setFill() context.fill(targetRect) UIBezierPath(roundedRect: targetRect, cornerRadius: 8).addClip() // Drawing image draw(in: targetRect) // Drawing a transparent mask UIColor.black.withAlphaComponent(0.4).setFill() context.fill(targetRect) // Drawing bar UIColor.white.setFill() context.fill(someBarRect) return UIGraphicsGetImageFromCurrentImageContext() } } 

参见图片