Ios WebP编码-'；架构中未找到符号'；问题

我目前正在做一个iOS移动应用示例（Xcode 7，Swift 2.2），它可以对WebP图像进行编码和解码。我已经下载了WebP框架的预编译版本，并使用桥接头文件包含在我的项目中。在使用WebPDecodeRGBA解码WebP图像时，它工作正常。但是，当我使用WebPEncodeRGB将jpg图像转换为WebP格式时，它会显示编译时错误，如下所示：

Undefined symbols for architecture i386:   
      "_WebPEncodeRGB", referenced from:
          static (extension in WebpImageTest):__ObjC.UIImage.imageToWebPData (__ObjC.NSData) -> __ObjC.UIImage? in ViewController.o  
      "_WebPEncodeRGB", referenced from:  
          WebpImageTest.ViewController.imageToWebPData (__ObjC.NSData) -> __ObjC.UIImage? in ViewController.o  
    ld: symbol(s) not found for architecture i386  
    clang: error: linker command failed with exit code 1 (use -v to see invocation)

func imageToWebPData(jpgImageData:NSData) -> UIImage? {  
    let imag = UIImage(data: jpgImageData)
    let compressionLevel = 10
    let inputImageWidth = imag!.size.width
    let inputImageHeight = imag!.size.height
    let image:CGImage = imag!.CGImage!
    let provider: CGDataProviderRef? = CGImageGetDataProvider(image)
    let bitmap: CFDataRef? = CGDataProviderCopyData(provider)

    let rgb: UnsafePointer<UInt8> = CFDataGetBytePtr(bitmap)
    let width: Int32 = Int32(inputImageWidth)
    let height: Int32 = Int32(inputImageHeight)
    let stride: Int32 = Int32(CGImageGetBytesPerRow(image))
    let qualityFactor: Float = Float(compressionLevel)

    var webp: NSData
    var output: UnsafeMutablePointer<UInt8> = nil
    var size: size_t = 0

    size = WebPEncodeRGB(rgb,width,height,stride,qualityFactor,&output)

    let afterByteLength = Int(size)
    webp = NSData(bytes: output, length: afterByteLength)
    free(output)
    return UIImage(data: webp)
  }

我添加了编码代码作为viewcontroller类的函数，如下所示：

Undefined symbols for architecture i386:   
      "_WebPEncodeRGB", referenced from:
          static (extension in WebpImageTest):__ObjC.UIImage.imageToWebPData (__ObjC.NSData) -> __ObjC.UIImage? in ViewController.o  
      "_WebPEncodeRGB", referenced from:  
          WebpImageTest.ViewController.imageToWebPData (__ObjC.NSData) -> __ObjC.UIImage? in ViewController.o  
    ld: symbol(s) not found for architecture i386  
    clang: error: linker command failed with exit code 1 (use -v to see invocation)

func imageToWebPData(jpgImageData:NSData) -> UIImage? {  
    let imag = UIImage(data: jpgImageData)
    let compressionLevel = 10
    let inputImageWidth = imag!.size.width
    let inputImageHeight = imag!.size.height
    let image:CGImage = imag!.CGImage!
    let provider: CGDataProviderRef? = CGImageGetDataProvider(image)
    let bitmap: CFDataRef? = CGDataProviderCopyData(provider)

    let rgb: UnsafePointer<UInt8> = CFDataGetBytePtr(bitmap)
    let width: Int32 = Int32(inputImageWidth)
    let height: Int32 = Int32(inputImageHeight)
    let stride: Int32 = Int32(CGImageGetBytesPerRow(image))
    let qualityFactor: Float = Float(compressionLevel)

    var webp: NSData
    var output: UnsafeMutablePointer<UInt8> = nil
    var size: size_t = 0

    size = WebPEncodeRGB(rgb,width,height,stride,qualityFactor,&output)

    let afterByteLength = Int(size)
    webp = NSData(bytes: output, length: afterByteLength)
    free(output)
    return UIImage(data: webp)
  }

func-imageToWebPData（jpgImageData:NSData）->UIImage？{  
设imag=UIImage（数据：jpgImageData）
让压缩水平=10
让inputImageWidth=imag！.size.width
让inputImageHeight=imag！.size.height
让image:CGImage=imag！.CGImage！
let提供程序：CGDataProviderRef？=CGImageGetDataProvider（图像）
let位图：CFDataRef？=CGDataProviderCopyData（提供程序）
设rgb:UnsafePointer=CFDataGetBytePtr（位图）
let width:Int32=Int32（inputImageWidth）
let高度：Int32=Int32（inputImageHeight）
让我们跨步：Int32=Int32（CGImageGetBytesPerRow（图像））
let qualityFactor:Float=Float（压缩级别）
var-webp:NSData
变量输出：UnsafeMutablePointer=nil
变量大小：大小\u t=0
大小=WebPEncodeRGB（rgb、宽度、高度、步幅、质量因子和输出）
let afterByteLength=Int（尺寸）
webp=NSData（字节：输出，长度：AfterByTeleLength）
自由（输出）
返回UIImage（数据：webp）
}

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另外，是否有其他方法可以使用Swift将jpg图像转换为WebP格式？

从您为WebPEncodeRGB加载类的位置？我是这样做的，您检查了吗？