ios - 如何获取 UIImage 中形状的 UIBezierPath 或以特定形状裁剪 UIImage

Question

我是 iOS 新手，我想知道是否可以获取 UIImage 的 UIBezierPath。我有一个面部布局的 UIImage，想要获取 UIBezierPath，这有助于我裁剪 UIImage。或者，谁能告诉我其他裁剪 UIImage 的方法吗？但要确保裁剪是自定义形状(例如:脸、心等)，而不是矩形。

Answer 1

下面是用图像遮盖图像的代码:

- (UIImage *)cerateImageFromImage:(UIImage *)image
                    withMaskImage:(UIImage *)mask {
    CGImageRef imageRef = image.CGImage;
    CGImageRef maskRef = mask.CGImage;

    CGImageRef imageMask = CGImageMaskCreate(CGImageGetWidth(maskRef),
                                             CGImageGetHeight(maskRef),
                                             CGImageGetBitsPerComponent(maskRef),
                                             CGImageGetBitsPerPixel(maskRef),
                                             CGImageGetBytesPerRow(maskRef),
                                             CGImageGetDataProvider(maskRef),
                                             NULL,
                                             YES);

    CGImageRef maskedReference = CGImageCreateWithMask(imageRef, imageMask);
    CGImageRelease(imageMask);

    UIImage *maskedImage = [UIImage imageWithCGImage:maskedReference];
    CGImageRelease(maskedReference);

    return maskedImage;
}

用法:

UIImage *image = [UIImage imageNamed:@"Photo.png"];
UIImage *mask = [UIImage imageNamed:@"Mask.png"];
self.imageView.image = [self cerateImageFromImage:image
                                     withMaskImage:mask];