-(UIImage *)unableImage:(UIImage*)originImage{
CIContext *context = [CIContext contextWithOptions:nil];
CIImage *superImage = [CIImage imageWithCGImage:originImage.CGImage];
CIFilter *lighten = [CIFilter filterWithName:@"CIColorControls"];
[lighten setValue:superImage forKey:kCIInputImageKey];
// // 修改亮度 -1---1 数越大越亮
[lighten setValue:@(0) forKey:@"inputBrightness"];
// 修改饱和度 0---2
[lighten setValue:@(0) forKey:@"inputSaturation"];
// // 修改对比度 0---4
[lighten setValue:@(0.5) forKey:@"inputContrast"];
CIImage *result = [lighten valueForKey:kCIOutputImageKey];
CGImageRef cgImage = [context createCGImage:result fromRect:[superImage extent]];
// 得到修改后的图片
UIImage *newImage = [UIImage imageWithCGImage:cgImage];
// 释放对象
CGImageRelease(cgImage);
return newImage;
}
iOS设置图片不可用 置灰效果的实现
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转载自blog.csdn.net/liuyinghui523/article/details/81059957
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