ios - 从 CGImageMetadata 转换为 nsdictionary

Question

我尝试将我的 360° 元数据图像转换为 nsdictionary。每次我尝试打印属性值时应用程序崩溃。我写了这段代码

CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)imageData, NULL); NSArray *metadataArray = nil;

if (source) {
    _metaData = CGImageSourceCopyMetadataAtIndex(source, 0, NULL);
    if (_metaData) {
        metadataArray = CFBridgingRelease(CGImageMetadataCopyTags(_metaData));
        CFRelease(_metaData);
    }
    CFRelease(source);
}

NSLog(@"%@",metadataArray[12]);//this is the problem

在输出中，我发现 immutableMetadata 的类型是 CGImageMetadata 而不是 NSdictionary。请问我如何转换为 nsdictionary？

Answer 1

swift

extension CGImageSource {

    func metadata() -> Dictionary<String, Any>? {

        guard let imageMetadata = CGImageSourceCopyMetadataAtIndex(self, 0, .none) else {
            return .none
        }

        guard let tags = CGImageMetadataCopyTags(imageMetadata) else {
            return .none
        }

        var result = [String: Any]()
        for tag in tags as NSArray {
            let tagMetadata = tag as! CGImageMetadataTag
            if let cfName = CGImageMetadataTagCopyName(tagMetadata) {
                let name = String(cfName)
                let value = CGImageMetadataTagCopyValue(tagMetadata)
                result[name] = value
            }
        }

        return result
    }
}