如何在iOS中使用CIFilter？ [英] How can I use CIFilter in iOS?

问题描述

Apple说CIFilter在iOS中可用。但是，在我的Mac上，我找不到要链接的CoreImage框架。

Apple says that CIFilter is available in iOS. However, on my mac I couldn't find an CoreImage framework to link against.

filter可选的Core Image过滤器
对象

filter An optional Core Image filter object that provides the transition.

@property（retain）CIFilter * filter

@property(retain) CIFilter *filter

即当我尝试执行类似操作时，由于CIFilter未知而崩溃：

i.e. when I try to do something like this, it crashes because CIFilter is unknown:

[transition setFilter:[CIFilter filterWithName:@"CIShapedWaterRipple"]];

我针对：

#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
#import <CoreGraphics/CoreGraphics.h>

推荐答案

以下是我如何生成

- (UIImage*)sepia
{    
    CIImage *beginImage = [CIImage imageWithCGImage:[self CGImage]];
    CIContext *context = [CIContext contextWithOptions:nil];

    CIFilter *filter = [CIFilter filterWithName:@"CISepiaTone" 
                                  keysAndValues: kCIInputImageKey, beginImage, 
                        @"inputIntensity", [NSNumber numberWithFloat:0.8], nil];
    CIImage *outputImage = [filter outputImage];

    CGImageRef cgimg = 
    [context createCGImage:outputImage fromRect:[outputImage extent]];
    UIImage *newImg = [UIImage imageWithCGImage:cgimg];

    self = newImg;

    CGImageRelease(cgimg);
    return self;
}

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