ios - CIFilter在运行时确定inputKey参数类型

Question

我们通过调用返回返回键数组的[filter inputKeys]来获取CIFilter的输入键。是否有建议的方法在运行时确定特定键的输入参数类型？

Answer 1

有了输入键，您可以将其用作属性字典的键，该字典应为每个输入键传递一个类型信息:

for( NSString* inputKey in filter.inputKeys ) 
{
   NSDictionary *attribute = filter.attributes[inputKey];
   NSString *inputKeyClassName = attribute[kCIAttributeClass];
   NSLog(@"%@: %@", inputKey, inputKeyClassName);
}

CIColorControl的输出:

2013-05-13 23:30:27.615 cifilter[7918:303] inputImage: CIImage
2013-05-13 23:30:27.616 cifilter[7918:303] inputSaturation: NSNumber
2013-05-13 23:30:27.616 cifilter[7918:303] inputBrightness: NSNumber
2013-05-13 23:30:27.616 cifilter[7918:303] inputContrast: NSNumber