ios – swift 2.0后的CGBitmapInfo alpha蒙版

概述我使用这个 github repo https://github.com/Haneke/HanekeSwift中的一个库缓存从服务器下载的映像.更新到swift 2.0后,一切都搞砸了. 除了这个功能,我已经能够修复一切： func hnk_decompressedImage() -> UIImage! { let originalImageRef = self.CGImage l @H_301_0@我使用这个 github repo https://github.com/Haneke/HanekeSwift中的一个库缓存从服务器下载的映像.更新到swift 2.0后,一切都搞砸了.

除了这个功能,我已经能够修复一切：

func hnk_decompressedImage() -> UIImage! {    let originalimageRef = self.CGImage    let originalBitmAPInfo = CGImageGetBitmAPInfo(originalimageRef)    let AlphaInfo = CGImageGetAlphaInfo(originalimageRef)    // See: https://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),colorSpace,bitmAPInfo) {        let imageRect = CGRectMake(0,pixelSize.wIDth,pixelSize.height)        UIGraphicsPushContext(context)        // Flip coordinate system. See: https://stackoverflow.com/questions/506622/cgcontextdrawimage-draws-image-upsIDe-down-when-passed-uiimage-cgimage        CGContextTranslateCTM(context,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 *** 作数

bitmAPInfo |= CGBitmAPInfo(rawValue: CGImageAlphaInfo.NoneskipFirst.rawValue)

错误：二进制运算符’| =’不能应用于类型为’CGBitmAPInfo’的 *** 作数

if let context = CGBitmapContextCreate(nil,bitmAPInfo)

错误：无法将类型“CGBitmAPInfo”的值转换为UInt32类型的预期参数

解决方法 错误：无法将类型“CGBitmAPInfo”的值转换为UInt32类型的预期参数

Swift 2.0实际上期望一个UInt32而不是一个CGBitMAPInfo对象,所以你应该在CGBitMAPInfo中取出一个UInt32变量.

CGBitmapContextCreate(    nil,bitmAPInfo.rawValue)

https://developer.apple.com/library/ios/documentation/GraphicsImaging/Reference/CGBitmapContext/#//apple_ref/c/func/CGBitmapContextCreate

总结

以上是内存溢出为你收集整理的ios – swift 2.0后的CGBitmapInfo alpha蒙版全部内容，希望文章能够帮你解决ios – swift 2.0后的CGBitmapInfo alpha蒙版所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。