使用存储文件的路径作为字符串存储和检索图像

Question

我正在使用 Realm 并将捕获图像的文件路径存储为Strings。我想稍后检索它们以在表视图中使用。这是我存储每个图像路径的代码：

func saveImage(imageName: String){
//create an instance of the FileManager
let fileManager = FileManager.default
//get the image path
thisImagePath = (NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString).appendingPathComponent(imageName)
//get the image taken with camera
let image = originalCapturedImage
//get the PNG data for this image
let data = UIImagePNGRepresentation(image!)
//store it in the document directory
fileManager.createFile(atPath: thisImagePath as String, contents: data, attributes: nil)
print("Picture path at assignment n")
print(thisImagePath as Any)
}

这是检索图像的代码：

...
var paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
let documentsPath = paths[0] //Get the docs directory
let filePath = URL(fileURLWithPath: documentsPath).appendingPathComponent(item.picPath).path
let image = UIImage(contentsOfFile: filePath)
print("Picture path at retrieval n")
print(item.picPath as Any)

cell.imageWell.image = image
cell.imageWell.clipsToBounds = true
return cell
}

以下是运行时文件路径的比较：

Picture path at assignment 
/var/mobile/Containers/Data/Application/0E9CACAD-C6B3-4F6C-B0DB-72C43AC722E1/Documents/1535219147
...
...
Picture path at retrieval 
/var/mobile/Containers/Data/Application/0E9CACAD-C6B3-4F6C-B0DB-72C43AC722E1/Documents/1535219147

路径看起来与我相同，但没有出现任何图像。我已经搜索了SO的各个地方，并且有一次提到使用URL作为文件路径。不知何故，我忘记了该条目，无法再次找到它。

任何帮助将不胜感激！

Answer 1

您可以尝试使用以下代码将图像写入文件，而不是创建包含内容的文件。try? data.write(to: URL(fileURLWithPath: documentsPath))

您还可以参考下面的代码来保存图像。

class func saveImageToFileWithDirectory(_ imageData:Data, fileName:String, folderName : String? = nil) {
let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true) as NSArray
let documentsDirectory = paths.object(at: 0) as! NSString
let path = documentsDirectory.appendingPathComponent(folderName) as NSString
if !FileManager.default.fileExists(atPath: path as String) {
do {
try FileManager.default.createDirectory(atPath: path as String, withIntermediateDirectories: true, attributes: nil)
} catch let error as NSError {
print(error.localizedDescription);
}
}
let imagePath = path.appendingPathComponent(fileName)
if !FileManager.default.fileExists(atPath: imagePath as String) {
try? imageData.write(to: URL(fileURLWithPath: imagePath))
} }

用于检索图像的代码看起来不错。如果您也需要帮助，请发表评论，我也会发布。

希望这能解决您的问题。