ios iOS8 照片框架：如何获取 PHAsset 的名称（或文件名）？
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iOS8 Photos Framework: How to get the name(or filename) of a PHAsset?
提问by Priyanka
Im trying to get the image name using PHAssets. But I couldn't find metadata for filename or any method to get the image name. Is there a different way to get the file name?
我正在尝试使用PHAssets. 但是我找不到文件名的元数据或任何获取图像名称的方法。有没有不同的方法来获取文件名？
采纳答案by Eridana
If you want to get the image name (for example name of last photo in Photos) like IMG_XXX.JPG, you can try this:
如果你想获得像 IMG_XXX.JPG 这样的图像名称（例如照片中最后一张照片的名称），你可以试试这个：
PHAsset *asset = nil;
PHFetchOptions *fetchOptions = [[PHFetchOptions alloc] init];
fetchOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];
PHFetchResult *fetchResult = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:fetchOptions];
if (fetchResult != nil && fetchResult.count > 0) {
// get last photo from Photos
asset = [fetchResult lastObject];
}
if (asset) {
// get photo info from this asset
PHImageRequestOptions * imageRequestOptions = [[PHImageRequestOptions alloc] init];
imageRequestOptions.synchronous = YES;
[[PHImageManager defaultManager]
requestImageDataForAsset:asset
options:imageRequestOptions
resultHandler:^(NSData *imageData, NSString *dataUTI,
UIImageOrientation orientation,
NSDictionary *info)
{
NSLog(@"info = %@", info);
if ([info objectForKey:@"PHImageFileURLKey"]) {
// path looks like this -
// file:///var/mobile/Media/DCIM/###APPLE/IMG_####.JPG
NSURL *path = [info objectForKey:@"PHImageFileURLKey"];
}
}];
}
Hope it helps.
希望能帮助到你。
In Swift the code will look like this
在 Swift 中，代码将如下所示
PHImageManager.defaultManager().requestImageDataForAsset(asset, options: PHImageRequestOptions(), resultHandler:
{
(imagedata, dataUTI, orientation, info) in
if info!.keys.contains(NSString(string: "PHImageFileURLKey"))
{
let path = info![NSString(string: "PHImageFileURLKey")] as! NSURL
}
})
Swift 4:
斯威夫特 4：
let fetchResult = PHAsset.fetchAssets(with: .image, options: nil)
if fetchResult.count > 0 {
if let asset = fetchResult.firstObject {
let date = asset.creationDate ?? Date()
print("Creation date: \(date)")
PHImageManager.default().requestImageData(for: asset, options: PHImageRequestOptions(),
resultHandler: { (imagedata, dataUTI, orientation, info) in
if let info = info {
if info.keys.contains(NSString(string: "PHImageFileURLKey")) {
if let path = info[NSString(string: "PHImageFileURLKey")] as? NSURL {
print(path)
}
}
}
})
}
}
回答by skim
I know the question has already been answered, but I figured I would provide another option:
我知道这个问题已经得到了回答，但我想我会提供另一个选择：
extension PHAsset {
var originalFilename: String? {
var fname:String?
if #available(iOS 9.0, *) {
let resources = PHAssetResource.assetResources(for: self)
if let resource = resources.first {
fname = resource.originalFilename
}
}
if fname == nil {
// this is an undocumented workaround that works as of iOS 9.1
fname = self.value(forKey: "filename") as? String
}
return fname
}
}
回答by Leo Natan
One more option is:
另一种选择是：
[asset valueForKey:@"filename"]
The "legality" of this is up to you to decide.
这样做的“合法性”由您来决定。
回答by d4Rk
Easiest solution for iOS 9+ in Swift 4 (based on skims answer):
Swift 4 中适用于 iOS 9+ 的最简单解决方案（基于skims 答案）：
extension PHAsset {
var originalFilename: String? {
return PHAssetResource.assetResources(for: self).first?.originalFilename
}
}
回答by Bart?omiej Semańczyk
Simplest answer with Swift when you have reference url to an asset:
当您拥有资产的参考网址时，Swift 的最简单答案：
if let asset = PHAsset.fetchAssetsWithALAssetURLs([referenceUrl], options: nil).firstObject as? PHAsset {
PHImageManager.defaultManager().requestImageDataForAsset(asset, options: nil, resultHandler: { _, _, _, info in
if let fileName = (info?["PHImageFileURLKey"] as? NSURL)?.lastPathComponent {
//do sth with file name
}
})
}
回答by Ahmad Labeeb
SWIFT4:first import Photos
SWIFT4：第一个import Photos
if let asset = PHAsset.fetchAssets(withALAssetURLs: [info[UIImagePickerControllerReferenceURL] as! URL],
options: nil).firstObject {
PHImageManager.default().requestImageData(for: asset, options: nil, resultHandler: { _, _, _, info in
if let fileName = (info?["PHImageFileURLKey"] as? NSURL)?.lastPathComponent {
print("///////" + fileName + "////////")
//do sth with file name
}
})
}
回答by Avi Levin
What you really looking for is the localIdentifierwhich is a unique string that persistently identifies the object.
您真正要寻找的是localIdentifier，它是一个唯一的字符串，可以持久地标识对象。
Use this string to find the object by using the:
使用此字符串通过以下方式查找对象：
fetchAssetsWithLocalIdentifiers:options:, fetchAssetCollectionsWithLocalIdentifiers:options:, or fetchCollectionListsWithLocalIdentifiers:options: method.
fetchAssetsWithLocalIdentifiers:options:, fetchAssetCollectionsWithLocalIdentifiers:options:, or fetchCollectionListsWithLocalIdentifiers:options: method.
More information is available here
可在此处获得更多信息
