我正在使用此github repo https://github.com/Haneke/HanekeSwift中的库来缓存从服务器下载的图像。更新到swift 2.0后,一切都搞砸了。
我已经能够修复除此功能之外的所有内容:
func hnk_decompressedImage() -> UIImage! {
let originalImageRef = self.CGImage
let originalBitmapInfo = CGImageGetBitmapInfo(originalImageRef)
let alphaInfo = CGImageGetAlphaInfo(originalImageRef)
// See: http://stackoverflow.com/questions/23723564/which-cgimagealphainfo-should-we-use
var bitmapInfo = originalBitmapInfo
switch (alphaInfo) {
case .None:
bitmapInfo &= ~CGBitmapInfo.AlphaInfoMask
bitmapInfo |= CGBitmapInfo(rawValue: CGImageAlphaInfo.NoneSkipFirst.rawValue)
case .PremultipliedFirst, .PremultipliedLast, .NoneSkipFirst, .NoneSkipLast:
break
case .Only, .Last, .First: // Unsupported
return self
}
let colorSpace = CGColorSpaceCreateDeviceRGB()
let pixelSize = CGSizeMake(self.size.width * self.scale, self.size.height * self.scale)
if let context = CGBitmapContextCreate(nil, Int(ceil(pixelSize.width)), Int(ceil(pixelSize.height)), CGImageGetBitsPerComponent(originalImageRef), 0, colorSpace, bitmapInfo) {
let imageRect = CGRectMake(0, 0, pixelSize.width, pixelSize.height)
UIGraphicsPushContext(context)
// Flip coordinate system. See: http://stackoverflow.com/questions/506622/cgcontextdrawimage-draws-image-upside-down-when-passed-uiimage-cgimage
CGContextTranslateCTM(context, 0, pixelSize.height)
CGContextScaleCTM(context, 1.0, -1.0)
// UIImage and drawInRect takes into account image orientation, unlike CGContextDrawImage.
self.drawInRect(imageRect)
UIGraphicsPopContext()
let decompressedImageRef = CGBitmapContextCreateImage(context)
let scale = UIScreen.mainScreen().scale
let image = UIImage(CGImage: decompressedImageRef, scale:scale, orientation:UIImageOrientation.Up)
return image
} else {
return self
}
}
具体来说,这是抛出错误的代码行:
bitmapInfo &= ~CGBitmapInfo.AlphaInfoMask
bitmapInfo |= CGBitmapInfo(rawValue: CGImageAlphaInfo.NoneSkipFirst.rawValue)
错误:一元运算符'〜'不能应用于CGBitmapInfo类型的操作数
bitmapInfo |= CGBitmapInfo(rawValue: CGImageAlphaInfo.NoneSkipFirst.rawValue)
错误:二元运算符' | ='不能应用于类型' CGBitmapInfo'
的操作数if let context = CGBitmapContextCreate(nil, Int(ceil(pixelSize.width)), Int(ceil(pixelSize.height)), CGImageGetBitsPerComponent(originalImageRef), 0, colorSpace, bitmapInfo)
错误:无法转换类型' CGBitmapInfo'的值预期的类型为UInt32的参数
答案 0 :(得分:22)
错误:无法将“CGBitmapInfo”类型的值转换为类型为UInt32的预期参数
Swift 2.0实际上需要UInt32而不是CGBitMapInfo对象,所以你应该在CGBitMapInfo中取出一个UInt32变量。
CGBitmapContextCreate(
nil,
Int(ceil(pixelSize.width)),
Int(ceil(pixelSize.height)),
CGImageGetBitsPerComponent(originalImageRef),
0,
colorSpace,
bitmapInfo.rawValue)
答案 1 :(得分:3)
<强> OptionSetType 强> 在swift 2中,CGBitmapInfo是一个OptionSetType。要初始化一个,您可以遵循惯例
/// static let Box = PackagingOptions(rawValue: 1)
/// static let Carton = PackagingOptions(rawValue: 2)
/// static let Bag = PackagingOptions(rawValue: 4)
/// static let Satchel = PackagingOptions(rawValue: 8)
/// static let BoxOrBag: PackagingOptions = [Box, Bag]
/// static let BoxOrCartonOrBag: PackagingOptions = [Box, Carton, Bag]
在CGBitmapInfo的情况下,它是OptionSetTypes的OptionSetType
public enum CGImageAlphaInfo : UInt32 {
case None /* For example, RGB. */
case PremultipliedLast /* For example, premultiplied RGBA */
case PremultipliedFirst /* For example, premultiplied ARGB */
case Last /* For example, non-premultiplied RGBA */
case First /* For example, non-premultiplied ARGB */
case NoneSkipLast /* For example, RBGX. */
case NoneSkipFirst /* For example, XRGB. */
case Only /* No color data, alpha data only */
}
@available(iOS 2.0, *)
public struct CGBitmapInfo : OptionSetType {
public init(rawValue: UInt32)
public static var AlphaInfoMask: 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 }
}
如何使用字节顺序和alpha掩码设置对其进行初始化的示例:
let bitmapInfo:CGBitmapInfo = [.ByteOrder32Little, CGBitmapInfo(rawValue: ~CGBitmapInfo.AlphaInfoMask.rawValue | CGImageAlphaInfo.PremultipliedFirst.rawValue)]