如何使用UIImagePickerController获取UIImage元数据。
我基本上有一个变量UIImage,我想获取元数据。
我需要像" myImage.date"以访问日期为例。
编辑1:我试试这个,但它崩溃了(在exif var上找到了nil)
func getData(image: UIImage) {
guard let data = UIImageJPEGRepresentation(image, 1),
let source = CGImageSourceCreateWithData(data as CFData, nil) else { return}
let imageProperties = CGImageSourceCopyPropertiesAtIndex(source, 0, nil)
let a = Unmanaged.passUnretained(kCGImagePropertyExifDateTimeOriginal).toOpaque()
let exif = CFDictionaryGetValue(imageProperties, a)
print(exif)
}
答案 0 :(得分:4)
您可能会发现这是一个有用的起点...
func getMetaData(forImage image: UIImage) {
guard let data = UIImageJPEGRepresentation(image, 1),
let source = CGImageSourceCreateWithData(data as CFData, nil) else { return}
if let type = CGImageSourceGetType(source) {
print("type: \(type)")
}
if let properties = CGImageSourceCopyProperties(source, nil) {
print("properties - \(properties)")
}
let count = CGImageSourceGetCount(source)
print("count: \(count)")
for index in 0..<count {
if let metaData = CGImageSourceCopyMetadataAtIndex(source, index, nil) {
print("all metaData[\(index)]: \(metaData)")
let typeId = CGImageMetadataGetTypeID()
print("metadata typeId[\(index)]: \(typeId)")
if let tags = CGImageMetadataCopyTags(metaData) as? [CGImageMetadataTag] {
print("number of tags - \(tags.count)")
for tag in tags {
let tagType = CGImageMetadataTagGetTypeID()
if let name = CGImageMetadataTagCopyName(tag) {
print("name: \(name)")
}
if let value = CGImageMetadataTagCopyValue(tag) {
print("value: \(value)")
}
if let prefix = CGImageMetadataTagCopyPrefix(tag) {
print("prefix: \(prefix)")
}
if let namespace = CGImageMetadataTagCopyNamespace(tag) {
print("namespace: \(namespace)")
}
if let qualifiers = CGImageMetadataTagCopyQualifiers(tag) {
print("qualifiers: \(qualifiers)")
}
print("-------")
}
}
}
if let properties = CGImageSourceCopyPropertiesAtIndex(source, index, nil) {
print("properties[\(index)]: \(properties)")
}
}
}