CI內部錯誤，內核參數1和參數

Question

我想創建一個CIColorClampFilter https://developer.apple.com/library/mac/documentation/GraphicsImaging/Reference/CoreImageFilterReference/index.html#//apple_ref/doc/filter/ci/CIColorClamp

它說我可以設置一個鍵「inputMinComponents」作爲之間類型不匹配一個[0,0,0,0]或任何我想要的RGB值。

但這代碼：

filter = CIFilter(name:"CIColorClamp") 
filter.setValue(ciImage, forKey: kCIInputImageKey) 
filter.setValue([0,0,0,0], forKey: "inputMinComponents") 

導致此錯誤：

CI internal error, type mismatch between kernel parameter 1 and argument 

我已經到處尋找其他CIColorClamp例子，但一無所獲。

你知道最近我想爲「inputMinComponents」鍵傳遞的值有什麼問題嗎？

Answer 1

顯然SWIFT的智能鑄件不工作，你必須explcitly創建一個CIVector

filter = CIFilter(name:"CIColorClamp") 
filter.setValue(ciImage, forKey: kCIInputImageKey) 
var lowerLevel = CIVector(x: 0.1, y: 0.1, z: 0.3, w: 0) 
filter.setValue(lowerLevel, forKey: "inputMinComponents") 
var upperLevel = CIVector(x: 0.5, y: 0.7, z: 0.9, w: 1) 
filter.setValue(upperLevel, forKey: "inputMaxComponents")