[iOS]CIFilter滤镜

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    // 滤镜效果

    NSArray *operations = @[@"CILinearToSRGBToneCurve",

                            @"CIPhotoEffectChrome",

                            @"CIPhotoEffectFade",

                            @"CIPhotoEffectInstant",

                            @"CIPhotoEffectMono",

                            @"CIPhotoEffectNoir",

                            @"CIPhotoEffectProcess",

                            @"CIPhotoEffectTonal",

                            @"CIPhotoEffectTransfer",

                            @"CISRGBToneCurveToLinear",

                            @"CIVignetteEffect"];

    CGFloat width = self.view.frame.size.width/;

    CGFloat height = self.view.frame.size.height/;

    NSMutableArray *imageViews = [NSMutableArray arrayWithCapacity:];

    for (int i = ; i < [operations count]; i++)

    {

        UIImageView *imageView = [[UIImageView alloc]initWithFrame:

                                  CGRectMake(i%*width, i/*height, width, height)];

        imageView.image = [UIImage imageNamed:@"timg.jpeg"];

        [imageViews addObject:imageView];

        [self.view addSubview:imageView];

    }

    dispatch_async(dispatch_get_global_queue(, ),^{

        NSMutableArray *images = [NSMutableArray arrayWithCapacity:];

        for (int i = ; i < [operations count]; i++)

        {

            UIImage *image = [UIImage imageNamed:@"timg.jpeg"];

            CIImage *cImage = [[CIImage alloc]initWithImage:image];

            //使用资源

            CIFilter *filter = [CIFilter filterWithName:operations[i]

                                          keysAndValues:kCIInputImageKey,cImage, nil];

            //使用默认参数

            [filter setDefaults];

            //生成上下文

            CIContext*context = [CIContext contextWithOptions:nil];

            //滤镜生成器输出图片

            CIImage *outputimage = [filter outputImage];

            //转换为UIImage

            CGImageRef ref = [context createCGImage:outputimage fromRect:[outputimage extent]];

            UIImage *temp = [UIImage imageWithCGImage:ref];

            [images addObject:temp];

            //释放

            CGImageRelease(ref);

        }

        dispatch_async(dispatch_get_main_queue(), ^{

            for (int x = ; x < [images count]; x++)

            {

                UIImageView *imageView = imageViews[x];

                imageView.image = images[x];

            }

        });

    });

}

原图

添加滤镜后效果图