How to get the list of filter names in CIFilter class?

All you need to do is ask CIFilter for the filter names. You can then ask each filter for its attributes, which returns a dictionary that describes each input and output parameter that the filter accepts.

NSArray* filters = [CIFilter filterNamesInCategories:nil];
for (NSString* filterName in filters)
{
    NSLog(@"Filter: %@", filterName);
    NSLog(@"Parameters: %@", [[CIFilter filterWithName:filterName] attributes]);
}

For example, this is the output of the above code for the CIZoomBlur filter:

Filter: CIZoomBlur
Parameters: {
    CIAttributeDescription = "Simulates the effect of zooming the camera while capturing the image.";
    CIAttributeFilterCategories =     (
        CICategoryBlur,
        CICategoryVideo,
        CICategoryStillImage,
        CICategoryBuiltIn
    );
    CIAttributeFilterDisplayName = "Zoom Blur";
    CIAttributeFilterName = CIZoomBlur;
    CIAttributeReferenceDocumentation = "http://developer.apple.com/cgi-bin/apple_ref.cgi?apple_ref=//apple_ref/doc/filter/ci/CIZoomBlur";
    inputAmount =     {
        CIAttributeClass = NSNumber;
        CIAttributeDefault = 20;
        CIAttributeDescription = "The zoom-in amount. Larger values result in more zooming in.";
        CIAttributeDisplayName = Amount;
        CIAttributeIdentity = 0;
        CIAttributeMin = 0;
        CIAttributeSliderMax = 200;
        CIAttributeSliderMin = 0;
        CIAttributeType = CIAttributeTypeDistance;
        CIUIParameterSet = CIUISetBasic;
    };
    inputCenter =     {
        CIAttributeClass = CIVector;
        CIAttributeDefault = "[150 150]";
        CIAttributeDescription = "The x and y position to use as the center of the effect.";
        CIAttributeDisplayName = Center;
        CIAttributeType = CIAttributeTypePosition;
        CIUIParameterSet = CIUISetBasic;
    };
    inputImage =     {
        CIAttributeClass = CIImage;
        CIAttributeDescription = "The image to use as an input image. For filters that also use a background image, this is the foreground image.";
        CIAttributeDisplayName = Image;
        CIUIParameterSet = CIUISetBasic;
    };
    outputImage =     {
        CIAttributeClass = CIImage;
    };
}

Most of the time, though, you'll probably just use the docs.

May be you can try following method of CIFilter class

+ (NSArray *)filterNamesInCategory:(NSString *)category

I found the list of names in CIFilter class, core image filters. here is the link names in CIFilter and the list of the filters.

Filters

CICategoryBlur
CIBoxBlur
CIDiscBlur
CIGaussianBlur
CIMaskedVariableBlur
CIMedianFilter
CIMotionBlur
CINoiseReduction

CICategoryColorAdjustment
CIColorClamp
CIColorControls
CIColorMatrix
CIColorPolynomial
CIExposureAdjust
CIGammaAdjust
CIHueAdjust
CILinearToSRGBToneCurve
CISRGBToneCurveToLinear
CITemperatureAndTint
CIToneCurve
CIVibrance
CIWhitePointAdjust

CICategoryColorEffect
CIColorCrossPolynomial
CIColorCube
CIColorCubeWithColorSpace
CIColorInvert
CIColorMap
CIColorMonochrome
CIColorPosterize
CIFalseColor
CIMaskToAlpha
CIMaximumComponent
CIMinimumComponent
CIPhotoEffectChrome
CIPhotoEffectFade
CIPhotoEffectInstant
CIPhotoEffectMono
CIPhotoEffectNoir
CIPhotoEffectProcess
CIPhotoEffectTonal
CIPhotoEffectTransfer
CISepiaTone
CIVignette
CIVignetteEffect

CICategoryCompositeOperation
CIAdditionCompositing
CIColorBlendMode
CIColorBurnBlendMode
CIColorDodgeBlendMode
CIDarkenBlendMode
CIDifferenceBlendMode
CIDivideBlendMode
CIExclusionBlendMode
CIHardLightBlendMode
CIHueBlendMode
CILightenBlendMode
CILinearBurnBlendMode
CILinearDodgeBlendMode
CILuminosityBlendMode
CIMaximumCompositing
CIMinimumCompositing
CIMultiplyBlendMode
CIMultiplyCompositing
CIOverlayBlendMode
CIPinLightBlendMode
CISaturationBlendMode
CIScreenBlendMode
CISoftLightBlendMode
CISourceAtopCompositing
CISourceInCompositing
CISourceOutCompositing
CISourceOverCompositing
CISubtractBlendMode

CICategoryDistortionEffect
CIBumpDistortion
CIBumpDistortionLinear
CICircleSplashDistortion
CICircularWrap
CIDroste
CIDisplacementDistortion
CIGlassDistortion
CIGlassLozenge
CIHoleDistortion
CILightTunnel
CIPinchDistortion
CIStretchCrop
CITorusLensDistortion
CITwirlDistortion
CIVortexDistortion

CICategoryGenerator
CIAztecCodeGenerator
CICheckerboardGenerator
CICode128BarcodeGenerator
CIConstantColorGenerator
CILenticularHaloGenerator
CIPDF417BarcodeGenerator
CIQRCodeGenerator
CIRandomGenerator
CIStarShineGenerator
CIStripesGenerator
CISunbeamsGenerator

CICategoryGeometryAdjustment
CIAffineTransform
CICrop
CILanczosScaleTransform
CIPerspectiveCorrection
CIPerspectiveTransform
CIPerspectiveTransformWithExtent
CIStraightenFilter

CICategoryGradient
CIGaussianGradient
CILinearGradient
CIRadialGradient
CISmoothLinearGradient

CICategoryHalftoneEffect
CICircularScreen
CICMYKHalftone
CIDotScreen
CIHatchedScreen
CILineScreen

CICategoryReduction
CIAreaAverage
CIAreaHistogram
CIRowAverage
CIColumnAverage
CIHistogramDisplayFilter
CIAreaMaximum
CIAreaMinimum
CIAreaMaximumAlpha
CIAreaMinimumAlpha

CICategorySharpen
CISharpenLuminance
CIUnsharpMask

CICategoryStylize
CIBlendWithAlphaMask
CIBlendWithMask
CIBloom
CIComicEffect
CIConvolution3X3
CIConvolution5X5
CIConvolution7X7
CIConvolution9Horizontal
CIConvolution9Vertical
CICrystallize
CIDepthOfField
CIEdges
CIEdgeWork
CIGloom
CIHeightFieldFromMask
CIHexagonalPixellate
CIHighlightShadowAdjust
CILineOverlay
CIPixellate
CIPointillize
CIShadedMaterial
CISpotColor
CISpotLight

CICategoryTileEffect
CIAffineClamp
CIAffineTile
CIEightfoldReflectedTile
CIFourfoldReflectedTile
CIFourfoldRotatedTile
CIFourfoldTranslatedTile
CIGlideReflectedTile
CIKaleidoscope
CIOpTile
CIParallelogramTile
CIPerspectiveTile
CISixfoldReflectedTile
CISixfoldRotatedTile
CITriangleKaleidoscope
CITriangleTile
CITwelvefoldReflectedTile

CICategoryTransition
CIAccordionFoldTransition
CIBarsSwipeTransition
CICopyMachineTransition
CIDisintegrateWithMaskTransition
CIDissolveTransition
CIFlashTransition
CIModTransition
CIPageCurlTransition
CIPageCurlWithShadowTransition
CIRippleTransition
CISwipeTransition

I was writing to your earlier post link to all filters. I will repeat: link to all filters.

And for example You need Blur effect. Blur is category and have 7 filters:

• CIBoxBlur
• CIDiscBlur
• CIGaussianBlur
• CIMedianFilter
• CIMotionBlur
• CINoiseReduction
• CIZoomBlur.

And etc..