我在使用CI过滤器时遇到了奇怪的错误，我怎么能通过查看日志来知道我错过了什么CIFilter*filter=[CIFilterfilterWithName:@"CIFalseColor"];[filtersetValue:imageforKey:@"inputImage"];CIColor*myBlue=[CIColorcolorWithRed:0.0green:0.0blue:0.6alpha:0.5];[filtersetValue:myBlueforKey:@"inputColor0"];CIImage*filteredImageData=[filtervalueForKey:@