Question

我在UIBezierPath中定义了一个形状。我也有一个UIImage。我现在想要使用UIBezierPath裁剪此图像。我怎么能这样做？

let shape = UIBezierPath(rect: imageRect)

let image = UIImage(cgimage: c)

Answer 1

我正在使用[1] "https:.../KBOS/2008/01/31/DailyHistory.html"代码。但是，在Objective C

中转换很容易

请尝试以下代码

swift3

然后保存

CAShapeLayer *newLayer = [[CAShapeLayer alloc] init];
newLayer.path = self.shape.CGPath;


[self.view.layer setMask:newLayer];

CGRect rectToCrop = self.shape.bounds;

UIGraphicsBeginImageContext(self.view.frame.size);//, NO, 0);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

[newLayer removeFromSuperlayer];
newLayer = nil;

CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], rectToCrop);
UIImage *croppedImage = [UIImage imageWithCGImage:imageRef scale:self.imgVPhoto.image.scale orientation:self.imgVPhoto.image.imageOrientation];
CGImageRelease(imageRef);

希望对你有所帮助

编辑

SWIFT转换

[[NSOperationQueue mainQueue] addOperationWithBlock:^{

    //saving cut Image
    NSData *imgData = UIImagePNGRepresentation(croppedImage);

    if (imgData) {

        NSString *imagePath = 

        if([FileUtility fileExistsAtFilePath:imagePath]) {
            [FileUtility deleteFile:imagePath];
        }

        //need to add this task in BG to avoid blocking of main thread

        [imgData writeToFile:imagePath atomically:true];

    }

}];

Answer 2

如果要在UIImageView中显示图像，则可以使用mask属性。

你需要在路径之外创建一个UIImage：

extension UIBezierPath {
    func asMaskImage(fillColor:UIColor = UIColor.black) -> UIImage
    {
        // Make a graphics context
        UIGraphicsBeginImageContextWithOptions(bounds.size, false, 0.0)
        let context = UIGraphicsGetCurrentContext()

        context!.setFillColor(fillColor.cgColor)

        // and fill it!
        self.fill()

        let image = UIGraphicsGetImageFromCurrentImageContext()

        UIGraphicsEndImageContext()

        return image!
     }
}

然后你用它作为面具：

myImageView.image = image
myImageView.mask = UIImageView(image: shape.asMaskImage())

使用UIBezierPath - Beginner裁剪图像

2 个答案: