我在用
UIImagePickerControllerDelegate,
UINavigationControllerDelegate,
UIPopoverControllerDelegate
这些代表从我的画廊或我的相机中选择图像。那么，如何在选择图像后获得图像文件大小？
我想用这个：
let filePath = "your path here"
var fileSize : UInt64 = 0
do {
let attr : NSDictionary? = try NSFileManager.defaultManager().attributesOfItemAtPath(filePath)
if let _attr = attr {
fileSize = _attr.fileSize();
print(fileSize)
}
} catch {
}
但是在这里我需要一条路径，但是如果没有路径，我只能通过图像文件获得？
请检查谷歌1 kb到字节，它将是1000。
因此，在获得适当大小的同时，我通过在App Bundle和模拟器中的照片中添加图像来添加多个场景。我从Mac上拍摄的图像是299.0 KB。
场景1：将图像添加到应用程序包
在Xcode中添加图像时，图像的大小在项目目录中保持不变。但是你从它的路径得到它的大小将减少到257.0 KB。这是设备或模拟器中使用的图像的实际大小。
guard let aStrUrl = Bundle.main.path(forResource: "1", ofType: "png") else { return }
let aUrl = URL(fileURLWithPath: aStrUrl)
print("Img size = \((Double(aUrl.fileSize) / 1000.00).rounded()) KB")
extension URL {
var attributes: [FileAttributeKey : Any]? {
do {
return try FileManager.default.attributesOfItem(atPath: path)
} catch let error as NSError {
print("FileAttribute error: \(error)")
}
return nil
}
var fileSize: UInt64 {
return attributes?[.size] as? UInt64 ?? UInt64(0)
}
var fileSizeString: String {
return ByteCountFormatter.string(fromByteCount: Int64(fileSize), countStyle: .file)
}
var creationDate: Date? {
return attributes?[.creationDate] as? Date
}
}
场景2：在模拟器中向照片添加图像
在模拟器或设备中向照片添加图像时，图像的大小从299.0 KB增加到393.0 KB。这是存储在设备或模拟器文档目录中的图像的实际大小。
斯威夫特4及更早
var image = info[UIImagePickerControllerOriginalImage] as! UIImage
var imgData: NSData = NSData(data: UIImageJPEGRepresentation((image), 1))
// var imgData: NSData = UIImagePNGRepresentation(image)
// you can also replace UIImageJPEGRepresentation with UIImagePNGRepresentation.
var imageSize: Int = imgData.count
print("size of image in KB: %f ", Double(imageSize) / 1000.0)
斯威夫特5
let image = info[UIImagePickerController.InfoKey.originalImage] as! UIImage
let imgData = NSData(data: (info[UIImagePickerController.InfoKey.originalImage] as! UIImage).jpegData(compressionQuality: 1)!)
var imageSize: Int = imgData.count
print("actual size of image in KB: %f ", Double(imageSize) / 1000.0)
通过添加.rounded（）它将为您提供393.0 KB并且不使用它将提供393.442 KB。因此，请使用上述代码手动检查图像大小。由于图像的大小可能因不同的设备和mac而异。我只在Mac mini和模拟器iPhone XS上查看它。
//斯威夫特4
if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
///check image Size
let imgData = NSData(data: UIImageJPEGRepresentation((pickedImage), 1)!)
let imageSize: Int = imgData.count
print("size of image in KB: %f ", Double(imageSize) / 1024.0)
print("size of image in MB: %f ", Double(imageSize) / 1024.0 / 1024)
}
试试这个
import Darwin
...
let size = malloc_size(&_attr)
迅捷3/4：
if let imageData = UIImagePNGRepresentation(image) {
let bytes = imageData.count
let kB = Double(bytes) / 1000.0 // Note the difference
let KB = Double(bytes) / 1024.0 // Note the difference
}
请注意kB和KB之间的差异。回答这里，因为在我的情况下，我们有一个问题，而我们认为千字节为1024字节，但服务器端认为它是1000字节，这引起了一个问题。 Link了解更多。
PS。几乎可以肯定你会使用kB（1000）。
斯威夫特3
let uploadData = UIImagePNGRepresentation(image)
let array = [UInt8](uploadData)
print("Image size in bytes:\(array.count)")
let selectedImage = info[UIImagePickerControllerOriginalImage] as! UIImage
let selectedImageData: NSData = NSData(data:UIImageJPEGRepresentation((selectedImage), 1))
let selectedImageSize:Int = selectedImageData.length
print("Image Size: %f KB", selectedImageSize /1024.0)
let data = UIImageJPEGRepresentation(image, 1)
let imageSize = data?.count
let imageData = UIImageJPEGRepresentation(image, 1)
let imageSize = imageData?.count
UIImageJPEGRepresentation - 以JPEG格式返回指定图像的Data对象。值1.0表示压缩程度最小（接近原始图像）。
imageData？.count - 返回数据长度（字符数等于字节数）。
重要！ UIImageJPEGRepresentation或UIImagePNGRepresentation不会返回原始图像。但是如果使用给定数据作为上传源 - 文件大小与服务器上的相同（甚至使用压缩）。
Swift 4.2
let jpegData = image.jpegData(compressionQuality: 1.0)
let jpegSize: Int = jpegData?.count ?? 0
print("size of jpeg image in KB: %f ", Double(jpegSize) / 1024.0)
extension String {
func getNumbers() -> [NSNumber] {
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
let charset = CharacterSet.init(charactersIn: " ,.")
return matches(for: "[+-]?([0-9]+([., ][0-9]*)*|[.][0-9]+)").compactMap { string in
return formatter.number(from: string.trimmingCharacters(in: charset))
}
}
// https://stackoverflow.com/a/54900097/4488252
func matches(for regex: String) -> [String] {
guard let regex = try? NSRegularExpression(pattern: regex, options: [.caseInsensitive]) else { return [] }
let matches = regex.matches(in: self, options: [], range: NSMakeRange(0, self.count))
return matches.compactMap { match in
guard let range = Range(match.range, in: self) else { return nil }
return String(self[range])
}
}
}
extension UIImage {
func getFileSizeInfo(allowedUnits: ByteCountFormatter.Units = .useMB,
countStyle: ByteCountFormatter.CountStyle = .file) -> String? {
// https://developer.apple.com/documentation/foundation/bytecountformatter
let formatter = ByteCountFormatter()
formatter.allowedUnits = allowedUnits
formatter.countStyle = countStyle
return getSizeInfo(formatter: formatter)
}
func getFileSize(allowedUnits: ByteCountFormatter.Units = .useMB,
countStyle: ByteCountFormatter.CountStyle = .memory) -> Double? {
guard let num = getFileSizeInfo(allowedUnits: allowedUnits, countStyle: countStyle)?.getNumbers().first else { return nil }
return Double(truncating: num)
}
func getSizeInfo(formatter: ByteCountFormatter, compressionQuality: CGFloat = 1.0) -> String? {
guard let imageData = jpegData(compressionQuality: compressionQuality) else { return nil }
return formatter.string(fromByteCount: Int64(imageData.count))
}
}
guard let image = UIImage(named: "img") else { return }
if let imageSizeInfo = image.getFileSizeInfo() {
print("\(imageSizeInfo), \(type(of: imageSizeInfo))") // 51.9 MB, String
}
if let imageSizeInfo = image.getFileSizeInfo(allowedUnits: .useBytes, countStyle: .file) {
print("\(imageSizeInfo), \(type(of: imageSizeInfo))") // 54,411,697 bytes, String
}
if let imageSizeInfo = image.getFileSizeInfo(allowedUnits: .useKB, countStyle: .decimal) {
print("\(imageSizeInfo), \(type(of: imageSizeInfo))") // 54,412 KB, String
}
if let size = image.getFileSize() {
print("\(size), \(type(of: size))") // 51.9, Double
}
试试这段代码（Swift 4.2）
extension URL {
var attributes: [FileAttributeKey : Any]? {
do {
return try FileManager.default.attributesOfItem(atPath: path)
} catch let error as NSError {
print("FileAttribute error: \(error)")
}
return nil
}
var fileSize: UInt64 {
return attributes?[.size] as? UInt64 ?? UInt64(0)
}
var fileSizeString: String {
return ByteCountFormatter.string(fromByteCount: Int64(fileSize), countStyle: .file)
}
var creationDate: Date? {
return attributes?[.creationDate] as? Date
}
}
并使用示例
guard let aStrUrl = Bundle.main.path(forResource: "example_image", ofType: "jpg") else { return }
let aUrl = URL(fileURLWithPath: aStrUrl)
print("Img size = \((Double(aUrl.fileSize) / 1000.00).rounded()) KB")