CategoryDistortionEffect的CIFilter示例

Question

谁能给出一个初始化kCICategoryDistortionEffect的CIFilter的例子？

我需要为我的摄影创建失真效果。我读到过，在iOS5中使用CIFilter是可能的，但是我找不到合适的代码来实现它。

Answer 1

我一直在找这个。到目前为止，这在iOS 5中似乎还不可用。以下是证据：

如果执行以下命令：

NSArray *properties = [CIFilter filterNamesInCategory:
                       kCICategoryBuiltIn];

您将看到它只返回以下列表，其中不包含任何kCICategoryDistortionEffect。它只包含：

CIAdditionCompositing,
CIAffineTransform,
CICheckerboardGenerator,
CIColorBlendMode,
CIColorBurnBlendMode,
CIColorControls,
CIColorCube,
CIColorDodgeBlendMode,
CIColorInvert,
CIColorMatrix,
CIColorMonochrome,
CIConstantColorGenerator,
CICrop,
CIDarkenBlendMode,
CIDifferenceBlendMode,
CIExclusionBlendMode,
CIExposureAdjust,
CIFalseColor,
CIGammaAdjust,
CIGaussianGradient,
CIHardLightBlendMode,
CIHighlightShadowAdjust,
CIHueAdjust,
CIHueBlendMode,
CILightenBlendMode,
CILinearGradient,
CILuminosityBlendMode,
CIMaximumCompositing,
CIMinimumCompositing,
CIMultiplyBlendMode,
CIMultiplyCompositing,
CIOverlayBlendMode,
CIRadialGradient,
CISaturationBlendMode,
CIScreenBlendMode,
CISepiaTone,
CISoftLightBlendMode,
CISourceAtopCompositing,
CISourceInCompositing,
CISourceOutCompositing,
CISourceOverCompositing,
CIStraightenFilter,
CIStripesGenerator,
CITemperatureAndTint,
CIToneCurve,
CIVibrance,
CIVignette,
CIWhitePointAdjust

缺少了我们感兴趣的那个：

CICategoryDistortionEffect,
CIBumpDistortion,
CIBumpDistortionLinear,
CICircleSplashDistortion,
CICircularWrap,
CIDisplacementDistortion,
CIGlassDistortion,
CIGlassLozenge,
CIHoleDistortion,
CIPinchDistortion,
CITorusLensDistortion,
CITwirlDistortion,
CIVortexDistortion

Answer 2

您可以使用以下代码查看所有筛选器类型

NSArray *filterNames =[CIFilter filterNamesInCategory:kCICategoryBuiltIn];
NSLog(@"Built in filters");
for (NSString *currentFilterName in filterNames)
{
    NSLog(@"%@", currentFilterName);
}