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我正在绘制带有核心图形的图像,比我想要将其用作另一图像的蒙版,但只是获得清晰的矩形图像。使用CGImageRef裁剪图像
看看我的裁剪功能有什么问题?
UIGraphicsBeginImageContext(CGSizeMake(self.bounds.size.width/0.5, self.bounds.size.height/0.5))
let imageCtx = UIGraphicsGetCurrentContext()
CGContextAddArc(imageCtx, CGFloat(self.frame.size.width) , CGFloat(self.frame.size.height), 158, 0, CGFloat(DegreesToRadians(Double(angle))) , 0)
CGContextSetLineWidth(imageCtx, 80)
CGContextDrawPath(imageCtx, .Stroke)
let myMask :CGImageRef = CGBitmapContextCreateImage(UIGraphicsGetCurrentContext())!
UIGraphicsEndImageContext()
let maskImage = UIImage(CGImage: myMask)
let testVideoPreview = UIImage(named: "alex")
guard let makedImage = testVideoPreview else {return}
var imageMaskOne: CGImageRef = CGImageMaskCreate(CGImageGetWidth(myMask), CGImageGetHeight(myMask), CGImageGetBitsPerComponent(myMask), CGImageGetBitsPerPixel(myMask), CGImageGetBytesPerRow(myMask), CGImageGetDataProvider(myMask), nil, // Decode is null
true)!
let masked: CGImageRef = CGImageCreateWithMask(makedImage.CGImage, imageMaskOne)!
//Finished
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 350, height: 350))
imageView.image = UIImage(CGImage: masked)
self.addSubview(imageView)
裁剪矩形部分的完美解决方案。 –