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| 关键词： tintColor UIImage maskImage outputContext saturationDeltaF self UIColor effectOutBuffer effectInBuffer CGBitmapContextG |
这篇文章主要分享了iOS7 毛玻璃特效代码，非常的实用，做IOS开发的童鞋们不要错过了原图：效果图： 实现：首先需要导入Accelerate.framework。然后把两个文件加入到自己的项目中即可。UIImage+ImageEffects.h复制代码代码如下:#import @interfaceUIImage(ImageEffects)-(UIImage*)applyLightEffect;-(UIImage*)applyExtraLightEffect;-(UIImage*)applyDarkEffect;-(UIImage*)applyTintEffectWithColor:(UIColor*)tintColor;-(UIImage*)applyBlurWithRadius:(CGFloat)blurRadius tintColor:(UIColor*)tintColor saturationDeltaFactor:(CGFloat)saturationDeltaFactor maskImage:(UIImage*)maskImage;@end UIImage+ImageEffects.m复制代码代码如下:#import "UIImage+ImageEffects.h"#import #import @implementationUIImage(ImageEffects)-(UIImage*)applyLightEffect{UIColor*tintColor =[UIColor colorWithWhite:1.0 alpha:0.3];return[self applyBlurWithRadius:30 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];}-(UIImage*)applyExtraLightEffect{UIColor*tintColor =[UIColor colorWithWhite:0.97 alpha:0.82];return[self applyBlurWithRadius:20 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];}-(UIImage*)applyDarkEffect{UIColor*tintColor =[UIColor colorWithWhite:0.11 alpha:0.73];return[self applyBlurWithRadius:20 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];}-(UIImage*)applyTintEffectWithColor:(UIColor*)tintColor{constCGFloatEffectColorAlpha=0.6;UIColor*effectColor = tintColor;int componentCount =CGColorGetNumberOfComponents(tintColor.CGColor);if(componentCount ==2){CGFloat b;if([tintColor getWhite:&b alpha:NULL]){effectColor =[UIColor colorWithWhite:b alpha:EffectColorAlpha];}}else{CGFloat r, g, b;if([tintColor getRed:&r green:&g blue:&b alpha:NULL]){effectColor =[UIColor colorWithRed:r green:g blue:b alpha:EffectColorAlpha];}}return[self applyBlurWithRadius:10 tintColor:effectColor saturationDeltaFactor:-1.0 maskImage:nil];}-(UIImage*)applyBlurWithRadius:(CGFloat)blurRadius tintColor:(UIColor*)tintColor saturationDeltaFactor:(CGFloat)saturationDeltaFactor maskImage:(UIImage*)maskImage{// Check pre-conditions.if(self.size.width <1||self.size.height <1){NSLog(@"*** error: invalid size: (%.2f x %.2f). Both dimensions must be >= 1: %@",self.size.width,self.size.height,self);returnnil;}if(!self.CGImage){NSLog(@"*** error: image must be backed by a CGImage: %@",self);returnnil;}if(maskImage &&!maskImage.CGImage){NSLog(@"*** error: maskImage must be backed by a CGImage: %@", maskImage);returnnil;}CGRect imageRect ={CGPointZero,self.size };UIImage*effectImage =self;BOOL hasBlur = blurRadius > __FLT_EPSILON__;BOOL hasSaturationChange = fabs(saturationDeltaFactor -1.)> __FLT_EPSILON__;if(hasBlur || hasSaturationChange){UIGraphicsBeginImageContextWithOptions(self.size, NO,[[UIScreen mainScreen] scale]);CGContextRef effectInContext =UIGraphicsGetCurrentContext();CGContextScaleCTM(effectInContext,1.0,-1.0);CGContextTranslateCTM(effectInContext,0,-self.size.height);CGContextDrawImage(effectInContext, imageRect,self.CGImage);vImage_Buffer effectInBuffer;effectInBuffer.data =CGBitmapContextGetData(effectInContext);effectInBuffer.width =CGBitmapContextGetWidth(effectInContext);effectInBuffer.height =CGBitmapContextGetHeight(effectInContext);effectInBuffer.rowBytes =CGBitmapContextGetBytesPerRow(effectInContext);UIGraphicsBeginImageContextWithOptions(self.size, NO,[[UIScreen mainScreen] scale]);CGContextRef effectOutContext =UIGraphicsGetCurrentContext();vImage_Buffer effectOutBuffer;effectOutBuffer.data =CGBitmapContextGetData(effectOutContext);effectOutBuffer.width =CGBitmapContextGetWidth(effectOutContext);effectOutBuffer.height =CGBitmapContextGetHeight(effectOutContext);effectOutBuffer.rowBytes =CGBitmapContextGetBytesPerRow(effectOutContext);if(hasBlur){// A description of how to compute the box kernel width from the Gaussian// radius (aka standard deviation) appears in the SVG spec:// http://www.w3.org/TR/SVG/filters.html#feGaussianBlurElement// // For larger values of 's' (s >= 2.0), an approximation can be used: Three// successive box-blurs build a piece-wise quadratic convolution kernel, which// approximates the Gaussian kernel to within roughly 3%.//// let d = floor(s * 3*sqrt(2*pi)/4 + 0.5)// // ... if d is odd, use three box-blurs of size 'd', centered on the output pixel.// CGFloat inputRadius = blurRadius *[[UIScreen mainScreen] scale];NSUInteger radius = floor(inputRadius *3.* sqrt(2* M_PI)/4+0.5);if(radius %2!=1){radius +=1;// force radius to be odd so that the three box-blur methodology works.}vImageBoxConvolve_ARGB8888(&effectInBuffer,&effectOutBuffer, NULL,0,0, radius, radius,0, kvImageEdgeExtend);vImageBoxConvolve_ARGB8888(&effectOutBuffer,&effectInBuffer, NULL,0,0, radius, radius,0, kvImageEdgeExtend);vImageBoxConvolve_ARGB8888(&effectInBuffer,&effectOutBuffer, NULL,0,0, radius, radius,0, kvImageEdgeExtend);}BOOL effectImageBuffersAreSwapped = NO;if(hasSaturationChange){CGFloat s = saturationDeltaFactor;CGFloat floatingPointSaturationMatrix[]={0.0722+0.9278* s,0.0722-0.0722* s,0.0722-0.0722* s,0,0.7152-0.7152* s,0.7152+0.2848* s,0.7152-0.7152* s,0,0.2126-0.2126* s,0.2126-0.2126* s,0.2126+0.7873* s,0,0,0,0,1,};constint32_t divisor =256;NSUInteger matrixSize =sizeof(floatingPointSaturationMatrix)/sizeof(floatingPointSaturationMatrix[0]);int16_t saturationMatrix[matrixSize];for(NSUInteger i =0; i < matrixSize;++i){saturationMatrix[i]=(int16_t)roundf(floatingPointSaturationMatrix[i]* divisor);}if(hasBlur){vImageMatrixMultiply_ARGB8888(&effectOutBuffer,&effectInBuffer, saturationMatrix, divisor, NULL, NULL, kvImageNoFlags);effectImageBuffersAreSwapped = YES;}else{vImageMatrixMultiply_ARGB8888(&effectInBuffer,&effectOutBuffer, saturationMatrix, divisor, NULL, NULL, kvImageNoFlags);}}if(!effectImageBuffersAreSwapped)effectImage =UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();if(effectImageBuffersAreSwapped)effectImage =UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();}// Set up output context.UIGraphicsBeginImageContextWithOptions(self.size, NO,[[UIScreen mainScreen] scale]);CGContextRef outputContext =UIGraphicsGetCurrentContext();CGContextScaleCTM(outputContext,1.0,-1.0);CGContextTranslateCTM(outputContext,0,-self.size.height);// Draw base image.CGContextDrawImage(outputContext, imageRect,self.CGImage);// Draw effect image.if(hasBlur){CGContextSaveGState(outputContext);if(maskImage){CGContextClipToMask(outputContext, imageRect, maskImage.CGImage);}CGContextDrawImage(outputContext, imageRect, effectImage.CGImage);CGContextRestoreGState(outputContext);}// Add in color tint.if(tintColor){CGContextSaveGState(outputContext);CGContextSetFillColorWithColor(outputContext, tintColor.CGColor);CGContextFillRect(outputContext, imageRect);CGContextRestoreGState(outputContext);}// Output image is ready.UIImage*outputImage =UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return outputImage;}@end 调用： 复制代码代码如下:UIImageView*me =[[UIImageView alloc] initWithFrame:CGRectMake(10,480,614,381)];[me setImage:[[UIImage imageNamed:@"me.webp"] applyBlurWithRadius:5 tintColor:[UIColor colorWithWhite:1 alpha:0.2] saturationDeltaFactor:1.8 maskImage:nil]];[self.view addSubview:me]; 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