如何将 UIimage 转换为字节数组,以便将其上传到我的 Web 服务中?
You can actually use a couple of lines to do it
guard let image = UIImage(named: "someImage"),
let data = image.jpegData(compressionQuality: 1.0) else { return }
// OR
guard let image = UIImage(named: "someImage"),
let data = image.pngData() else { return }
The number should range from 0.0 to 1.0 and sets the jpeg quality. PNG is lossless so there is no need for compression quality identifier but be aware that the file size can be about 10 times higher
--- update ---
Updated for Swift 5.1
You can convert UIImage
to NSData
and pass it to this method
func getArrayOfBytesFromImage(imageData:NSData) -> NSMutableArray
{
// the number of elements:
let count = imageData.length / sizeof(UInt8)
// create array of appropriate length:
var bytes = [UInt8](count: count, repeatedValue: 0)
// copy bytes into array
imageData.getBytes(&bytes, length:count * sizeof(UInt8))
var byteArray:NSMutableArray = NSMutableArray()
for (var i = 0; i < count; i++) {
byteArray.addObject(NSNumber(unsignedChar: bytes[i]))
}
return byteArray
}
Swift 5, iOS 14 version based on toofani answer, minimal changes
func getArrayOfBytesFromImage(imageData:NSData) -> Array<UInt8>
{
// the number of elements:
let count = imageData.length / MemoryLayout<Int8>.size
// create array of appropriate length:
var bytes = [UInt8](repeating: 0, count: count)
// copy bytes into array
imageData.getBytes(&bytes, length:count * MemoryLayout<Int8>.size)
var byteArray:Array = Array<UInt8>()
for i in 0 ..< count {
byteArray.append(bytes[i])
}
return byteArray
}
So a complete sequence looks like this... assuming I got a UIImage I extract the data and then recombine it.
let data = imageX.pngData()
bytes = getArrayOfBytesFromImage(imageData: data! as NSData)
let datos: NSData = NSData(bytes: bytes, length: bytes.count)
newImage = UIImage(data: datos as Data) // Note it's optional. Don't force unwrap!!!
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