Question

如何将UIimage转换为字节数组，以便将其上传到我的网络服务中？

Answer 1

您实际上可以使用一行来执行此操作

guard let image = UIImage(named: "someImage") else { return }
guard let data = image.jpegData(compressionQuality: 1.0) else { return }

该数字的范围应为0.0到1.0，并设置jpeg质量

--- update ---

针对Swift 4.2进行了更新

Answer 2

您可以将UIImage转换为NSData并将其传递给此方法

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


}

Answer 3

基于toofani答案的Swift 5，iOS 14版本，更改最少

npm install

所以一个完整的序列看起来像这样...假设我得到了UIImage，我提取了数据然后重新组合。

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


}

在swift中将UIImage转换为字节数组

3 个答案: