如何在iPhone OS中使用CIFilter？

Question

Apple表示CIFilter可在iPhone OS中使用.但是,在我的Mac上,我找不到要链接的CoreImage框架.

filter(过滤器)提供转换的可选Core Image过滤器对象.

@property(保留)CIFilter*过滤器

即当我尝试做这样的事情时,它崩溃了,因为CIFilter是未知的:

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

我联系到:

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

Answer 1

以下是我如何使用CIFilter在iPhone上生成过滤的UIImage的示例.

- (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;
}

Answer 2

CIFilter 从 iOS 5 开始可用