- [UIImage _imageByUnpremultiplying]:发送到实例的无法识别的选择器

Question

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) 

Answer 1

如果您设置的对象"inputImage"是a,则会发生此异常UIImage.根据文档,inputImage对象必须是一个CIImage.

首先尝试从你的UIImage获得CIImage.

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