Question

我正在尝试将UIimage迅速转换为字节数组。我搜索了很多，但是解决方案太旧（快速2）或无法使用。有人知道这样做的方法吗？谢谢

Answer 1

尝试一下！

guard let image = UIImage(named: "someImage") else { return } 

let data = UIImageJPEGRepresentation(image, 1.0)

OR you can convert UIImage to NSData

func getArrayOfBytesFromImage(imageData:NSData) -> NSMutableArray
{

    // the number of elements:
    let count = data.length / MemoryLayout<UInt8>.size

    // create array of appropriate length:
    var bytes = [UInt8](repeating: 0, count: count)
    // copy bytes into array
    imageData.getBytes(&bytes, length:count)

    var byteArray:NSMutableArray = NSMutableArray()

    for (var i = 0; i < count; i++) {
        byteArray.addObject(NSNumber(unsignedChar: bytes[i]))
    }

    return byteArray
}

Answer 2

上述解决方案不正确，每个字节复制字节的速度非常慢一张大图片花了4秒，以下花了0.02秒（Swift3的新构造函数）

 let data: [UInt8] = [...]
 let image = UIImage(data: Data(bytes: data, count: data.count))

 guard let dataPng: Data = image.pngData() else { return [] }
 let finalData = [UInt8](dataPng)

如何在Swift 4中将UIImage转换为字节数组

2 个答案: