//第一種方式是使用UIVisualEffectView實(shí)現(xiàn)

????self.imageView = [[UIImageView alloc] init];

? ? self.imageView.image = [UIImage imageNamed:@"1.jpg"];

? ? self.imageView.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

? ? [self.view addSubview:self.imageView];

? ? //樣式可以選擇

? ? UIBlurEffect *blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];

? ? UIVisualEffectView *effectV = [[UIVisualEffectView alloc] initWithEffect:blur];

? ? effectV.alpha = 0.7;

? ? effectV.frame = CGRectMake(0, 0, self.view.frame.size.width / 2, self.view.frame.size.height);

? ? [self.imageView addSubview:effectV];

//第二種方式使用CoreImage實(shí)現(xiàn)

? ? //Core Image設(shè)置模糊之后會(huì)在周圍產(chǎn)生白邊

? ? UIImage *image = [UIImage imageNamed:@"1.jpg"];

? ? UIImage *blurImage = [self coreBlueImage:image];

? ? self.imageView.image = blurImage;

? ? //返回當(dāng)前類別下的所有濾鏡,更換不同的category會(huì)打印不同的濾鏡名稱

? ? /*

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryDistortionEffect;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryGeometryAdjustment;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryCompositeOperation;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryHalftoneEffect;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryColorAdjustment;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryColorEffect;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryTransition;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryTileEffect;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryGenerator;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryReduction NS_AVAILABLE(10_5, 5_0);

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryGradient;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryStylize;

? ? CORE_IMAGE_EXPORT NSString * const kCICategorySharpen;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryBlur;? ? 各種模糊分類

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryVideo;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryStillImage;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryInterlaced;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryNonSquarePixels;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryHighDynamicRange;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryBuiltIn;

? ? CORE_IMAGE_EXPORT NSString * const kCICategoryFilterGenerator NS_AVAILABLE(10_5, 9_0);

? ? */

? ? NSArray *filters = [CIFilter filterNamesInCategory:kCICategoryBlur];

? ? for (NSString *filterName in filters) {

? ? ? ? //我們可以通過filterName創(chuàng)建對(duì)應(yīng)的濾鏡對(duì)象

? ? ? ? NSLog(@"濾鏡名稱:%@",filterName);

//? ? ? ? CIFilter *filter = [CIFilter filterWithName:filterName];

//? ? ? ? NSDictionary *attributes = [filter attributes];

//? ? ? ? //獲取屬性鍵/值對(duì)（在這個(gè)字典中我們可以看到濾鏡的屬性以及對(duì)應(yīng)的key）

//? ? ? ? NSLog(@"filter attributes:%@",attributes);

? ? }

? ? /*

? ? kCICategoryBlur分類下所有濾鏡名稱

? ? CIBokehBlur

? ? CIBoxBlur

? ? CIDepthBlurEffect

? ? CIDiscBlur

? ? CIGaussianBlur

? ? CIMaskedVariableBlur

? ? CIMedianFilter

? ? CIMorphologyGradient

? ? CIMorphologyMaximum

? ? CIMorphologyMinimum

? ? CIMotionBlur

? ? CINoiseReduction

? ? CIZoomBlur

? ? */

使用到如下的方法

- (UIImage *)coreBlueImage:(UIImage *)image {

? ? //創(chuàng)建輸入CIImage對(duì)象

? ? CIImage *inputImage = [CIImage imageWithCGImage:image.CGImage];

? ? //創(chuàng)建濾鏡(可以更換不同的濾鏡,濾鏡名稱可以從以上代碼獲取

? ? CIFilter *filter = [CIFilter filterWithName:@"CIBoxBlur"];

? ? //設(shè)置濾鏡屬性值為默認(rèn)值

? ? [filter setDefaults];

? ? //設(shè)置輸入圖像

? ? [filter setValue:inputImage forKey:kCIInputImageKey];

? ? //獲取輸出圖像

? ? CIImage *result = [filter valueForKey:kCIOutputImageKey];

? ? //創(chuàng)建CIContex上下文對(duì)象

? ? CIContext *context = [CIContext contextWithOptions:nil];

? ? CGImageRef outImage = [context createCGImage: result fromRect:[result extent]];

? ? UIImage *blurImage = [UIImage imageWithCGImage:outImage];

? ? CGImageRelease(outImage);

? ? return blurImage;

}

高斯模糊

代碼已上傳至GitHub

點(diǎn)擊下載代碼

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