ios – – [UIImage _imageByUnpremultiplying]：发送到实例的无

发布时间：2020-12-14 19:27:57 所属栏目：百科来源：网络整理

导读：我正在使用CI过滤器并得到奇怪的错误,我怎么能通过查看登录来了解我所缺少的内容 CIFilter *filter = [CIFilter filterWithName:@"CIFalseColor"]; [filter setValue:image forKey:@"inputImage"]; CIColor *myBlue = [CIColor colorWithRed:0.0 green:0.0 b

我正在使用CI过滤器并得到奇怪的错误,我怎么能通过查看登录来了解我所缺少的内容

CIFilter *filter = [CIFilter filterWithName:@"CIFalseColor"];        
    [filter setValue:image forKey:@"inputImage"];
    CIColor *myBlue = [CIColor colorWithRed:0.0 green:0.0 blue:0.6 alpha:0.5];
    [filter setValue:myBlue forKey:@"inputColor0"];
    CIImage *filteredImageData = [filter valueForKey:@"outputImage"];
    UIImage *newImage = [UIImage imageWithCIImage:filteredImageData];
     _imageView.image=newImage;



2014-02-22 16:04:12.002 colorMaker[1574:70b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException',reason: '-[UIImage _imageByUnpremultiplying]: unrecognized selector sent to instance 0x8b7aca0'

libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

解决方法

如果您设置为“inputImage”的对象是UIImage,则会发生此异常.根据 documentation,inputImage对象必须是CIImage.

首先尝试从你的UIImage获得CIImage.

[filter setValue:image.CIImage forKey:@"inputImage"];
                       ^^^^^^^

（编辑：李大同）

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