在我的应用程序中，我将图像存储在本地存储中，我正在我的数据库中保存该图像的路径。如何从该路径加载图像？
这是我用来保存图像的代码：
let myimage : UIImage = UIImage(data: data)!
let fileManager = NSFileManager.defaultManager()
let urls = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
let documentDirectory = urls[0] as NSURL
print(documentDirectory)
let currentDate = NSDate()
let dateFormatter = NSDateFormatter()
dateFormatter.dateStyle = .NoStyle
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
let convertedDate = dateFormatter.stringFromDate(currentDate)
let imageURL = documentDirectory.URLByAppendingPathComponent(convertedDate)
imageUrlPath = imageURL.absoluteString
print(imageUrlPath)
UIImageJPEGRepresentation(myimage,1.0)!.writeToFile(imageUrlPath, atomically: true)
这是我的图像存储的路径
file:///var/mobile/Containers/Data/Application/B2A1EE50-D800-4BB0-B475-6C7F210C913C/Documents/2016-06-01%2021:49:32
这是我试图检索图像，但它没有显示任何东西。
let image : String = person?.valueForKey("image_local_path") as! String
print(person!.valueForKey("image_local_path")! as! String)
cell.img_message_music.image = UIImage(contentsOfFile: image)
Folder / B2A1EE50- ...每次运行应用程序时都会更改。
../Application/B2A1EE50-D800-4BB0-B475-6C7F210C913C/Documents/..
对我有用的是存储fileName和获取文档文件夹。
斯威夫特3 +
为目录文件夹创建getter
var documentsUrl: URL {
return FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
}
保存图片 ：
private func save(image: UIImage) -> String? {
let fileName = "FileName"
let fileURL = documentsUrl.appendingPathComponent(fileName)
if let imageData = UIImageJPEGRepresentation(image, 1.0) {
try? imageData.write(to: fileURL, options: .atomic)
return fileName // ----> Save fileName
}
print("Error saving image")
return nil
}
加载图片：
private func load(fileName: String) -> UIImage? {
let fileURL = documentsUrl.appendingPathComponent(fileName)
do {
let imageData = try Data(contentsOf: fileURL)
return UIImage(data: imageData)
} catch {
print("Error loading image : \(error)")
}
return nil
}
你也可以尝试这个。
if NSFileManager.defaultManager().fileExistsAtPath(imageUrlPath) {}
let url = NSURL(string: imageUrlPath)
let data = NSData(contentsOfURL: url!)
imageView.image = UIImage(data: data!)
最终代码：
if NSFileManager.defaultManager().fileExistsAtPath(imageUrlPath) {
let url = NSURL(string: imageUrlPath)
let data = NSData(contentsOfURL: url!)
imageView.image = UIImage(data: data!)
}
这段代码适合我
func getImageFromDir(_ imageName: String) -> UIImage? {
if let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first {
let fileURL = documentsUrl.appendingPathComponent(imageName)
do {
let imageData = try Data(contentsOf: fileURL)
return UIImage(data: imageData)
} catch {
print("Not able to load image")
}
}
return nil
}
用absoluteString替换path
let myimage : UIImage = UIImage(data: data)!
let fileManager = NSFileManager.defaultManager()
let urls = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
let documentDirectory = urls[0] as NSURL
print(documentDirectory)
let currentDate = NSDate()
let dateFormatter = NSDateFormatter()
dateFormatter.dateStyle = .NoStyle
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
let convertedDate = dateFormatter.stringFromDate(currentDate)
let imageURL = documentDirectory.URLByAppendingPathComponent(convertedDate)
imageUrlPath = imageURL.path
print(imageUrlPath)
UIImageJPEGRepresentation(myimage,1.0)!.writeToFile(imageUrlPath, atomically: true)
此示例代码可能会节省某人打字，
在您自己的目录中写一个UIImage到磁盘：
IM = UIImage, your image. for example, IM = someUIView.image or from the camera
let newPhotoFileName = randomNameString() + ".jpeg"
let imagePath = checkedImageDirectoryStringPath() + "/" + newPhotoFileName
let imData = UIImageJPEGRepresentation(IM, 0.20)
FileManager.default.createFile(atPath: imagePath, contents: imData, attributes: nil)
print("saved at filename \(newPhotoFileName)")
后来读那个图像......
..并将其转换回UIImage中的UIImage
NAME = that filename, like jahgfdfs.jpg
let p = checkedImageDirectoryStringPath() + "/" + NAME
devCheckExists(fullPath: p)
var imageData: Data? = nil
do {
let u = URL(fileURLWithPath: p)
imageData = try Data(contentsOf: u)
}
catch {
print("catastrophe loading file?? \(error)")
return
}
// and then to "make that an image again"...
imageData != nil {
picture.image = UIImage(data: imageData!)
print("that seemed to work")
}
else {
print("the imageData is nil?")
}
// or for example...
Alamofire.upload(
multipartFormData: { (multipartFormData) in
multipartFormData.append(imageData!,
withName: "file", fileName: "", mimeType: "image/jpeg")
...
以下是上面使用的非常方便的功能......
func checkedImageDirectoryStringPath()->String {
// create/check OUR OWN IMAGE DIRECTORY for use of this app.
let paths = NSSearchPathForDirectoriesInDomains(
.documentDirectory, .userDomainMask, true)
if paths.count < 1 {
print("some sort of disaster finding the our Image Directory - giving up")
return "x"
// any return will lead to disaster, so just do that
// (it will then gracefully fail when you "try" to write etc)
}
let docDirPath: String = paths.first!
let ourDirectoryPath = docDirPath.appending("/YourCompanyName")
// so simply makes a directory called "YourCompanyName"
// which will be there for all time, for your use
var ocb: ObjCBool = true
let exists = FileManager.default.fileExists(
atPath: ourDirectoryPath, isDirectory: &ocb)
if !exists {
do {
try FileManager.default.createDirectory(
atPath: ourDirectoryPath,
withIntermediateDirectories: false,
attributes: nil)
print("we did create our Image Directory, for the first time.")
// never need to again
return ourDirectoryPath
}
catch {
print(error.localizedDescription)
print("disaster trying to make our Image Directory?")
return "x"
// any return will lead to disaster, so just do that
}
}
else {
// already exists, as usual.
return ourDirectoryPath
}
}
和
func randomNameString(length: Int = 7)->String{
enum s {
static let c = Array("abcdefghjklmnpqrstuvwxyz12345789".characters)
static let k = UInt32(c.count)
}
var result = [Character](repeating: "a", count: length)
for i in 0..<length {
let r = Int(arc4random_uniform(s.k))
result[i] = s.c[r]
}
return String(result)
}
和
func devCheckExists(fullPath: String) {
var ocb: ObjCBool = false
let itExists = FileManager.default.fileExists(atPath: fullPath, isDirectory: &ocb)
if !itExists {
// alert developer. processes will fail at next step
print("\n\nDOES NOT EXIST\n\(fullPath)\n\n")
}
}
斯威夫特4：
if FileManager.default.fileExists(atPath: imageUrlPath) {
let url = NSURL(string: imageUrlPath)
let data = NSData(contentsOf: url! as URL)
chapterImage.image = UIImage(data: data! as Data)
}
1.cell.image.sd_setShowActivityIndicatorView（真）
2.cell.image.sd_setIndicatorStyle（.gray）
3.cell.image.image = UIImage（contentsOfFile：urlString！）