我需要做同样的事情 - 从 iOS 获取 UIImage 并将其保存到可用的 Windows .bmp 文件中。我实际上在 Adafruit PyPortal IoT 设备(而不是 Windows 机器)上使用了它,但下面的技术运行良好。将数据保存到 Firebase Storage 并能够在 PyPortal 中使用它。
我在这里找到了一个有用的扩展:在 Swift 中将 UIImage 转换为 NSData 并转换回 UIImage? https://stackoverflow.com/questions/32297704/convert-uiimage-to-nsdata-and-convert-back-to-uiimage-in-swift/50729656
我使用了这个扩展:
// 请注意,您需要导入 MobileCoreServices 才能识别 k 值
import MobileCoreServices
extension UIImage {
func toJpegData (compressionQuality: CGFloat, hasAlpha: Bool = true, orientation: Int = 6) -> Data? {
guard cgImage != nil else { return nil }
let options: NSDictionary = [
kCGImagePropertyOrientation: orientation,
kCGImagePropertyHasAlpha: hasAlpha,
kCGImageDestinationLossyCompressionQuality: compressionQuality
]
return toData(options: options, type: .jpeg)
}
func toData (options: NSDictionary, type: ImageType) -> Data? {
guard cgImage != nil else { return nil }
return toData(options: options, type: type.value)
}
// about properties: https://developer.apple.com/documentation/imageio/1464962-cgimagedestinationaddimage
func toData (options: NSDictionary, type: CFString) -> Data? {
guard let cgImage = cgImage else { return nil }
return autoreleasepool { () -> Data? in
let data = NSMutableData()
guard let imageDestination = CGImageDestinationCreateWithData(data as CFMutableData, type, 1, nil) else { return nil }
CGImageDestinationAddImage(imageDestination, cgImage, options)
CGImageDestinationFinalize(imageDestination)
return data as Data
}
}
// https://developer.apple.com/documentation/mobilecoreservices/uttype/uti_image_content_types
enum ImageType {
case image // abstract image data
case jpeg // JPEG image
case jpeg2000 // JPEG-2000 image
case tiff // TIFF image
case pict // Quickdraw PICT format
case gif // GIF image
case png // PNG image
case quickTimeImage // QuickTime image format (OSType 'qtif')
case appleICNS // Apple icon data
case bmp // Windows bitmap
case ico // Windows icon data
case rawImage // base type for raw image data (.raw)
case scalableVectorGraphics // SVG image
case livePhoto // Live Photo
var value: CFString {
switch self {
case .image: return kUTTypeImage
case .jpeg: return kUTTypeJPEG
case .jpeg2000: return kUTTypeJPEG2000
case .tiff: return kUTTypeTIFF
case .pict: return kUTTypePICT
case .gif: return kUTTypeGIF
case .png: return kUTTypePNG
case .quickTimeImage: return kUTTypeQuickTimeImage
case .appleICNS: return kUTTypeAppleICNS
case .bmp: return kUTTypeBMP
case .ico: return kUTTypeICO
case .rawImage: return kUTTypeRawImage
case .scalableVectorGraphics: return kUTTypeScalableVectorGraphics
case .livePhoto: return kUTTypeLivePhoto
}
}
}
}
我在代码中这样称呼它:
(我要转换的图像是UIImage
命名的值backgroundImage
这是下面的代码所在的类的属性)。
let options: NSDictionary = [:]
let convertToBmp = self.backgroundImage.toData(options: options, type: .bmp)
guard let bmpData = convertToBmp else {
print("???? ERROR: could not convert image to a bitmap bmpData var.")
return
}
Cheers!