二元运算符＆＃39;＆amp;＆＃39;不能应用于两个`CGBitmapInfo`操作数

Question

我正在尝试将UIImage效果类别从Objective-C转换为Swift语言。

当我尝试做某事时：

let inputImageBitmapInfo = CGImageGetBitmapInfo(inputCGImage)
let inputImageAlphaInfo = inputImageBitmapInfo & CGBitmapInfo.AlphaInfoMask

错误显示：

  

二元运算符＆＃39;＆amp;＆＃39;不能应用于两个CGBitmapInfo个操作数

Objective-C版本可以使用位掩码，但是Swift 不能。

Objective-C：

typedef CF_OPTIONS(uint32_t, CGBitmapInfo) {
    kCGBitmapAlphaInfoMask = 0x1F,

    kCGBitmapFloatInfoMask = 0xF00,
    kCGBitmapFloatComponents = (1 << 8),

    kCGBitmapByteOrderMask = 0x7000,
    kCGBitmapByteOrderDefault = (0 << 12),
    kCGBitmapByteOrder16Little = (1 << 12),
    kCGBitmapByteOrder32Little = (2 << 12),
    kCGBitmapByteOrder16Big = (3 << 12),
    kCGBitmapByteOrder32Big = (4 << 12)
} CF_ENUM_AVAILABLE(10_4, 2_0);

夫特：

public struct CGBitmapInfo : OptionSetType {
    public init(rawValue: UInt32)

    public static var AlphaInfoMask: CGBitmapInfo { get }

    public static var FloatInfoMask: CGBitmapInfo { get }
    public static var FloatComponents: CGBitmapInfo { get }

    public static var ByteOrderMask: CGBitmapInfo { get }
    public static var ByteOrderDefault: CGBitmapInfo { get }
    public static var ByteOrder16Little: CGBitmapInfo { get }
    public static var ByteOrder32Little: CGBitmapInfo { get }
    public static var ByteOrder16Big: CGBitmapInfo { get }
    public static var ByteOrder32Big: CGBitmapInfo { get }
}