如何将以下ObjC代码的最后一行翻译成Swift:CGAffineTransformtransform=CGAffineTransformIdentity;CIFilter*clampFilter=[CIFilterfilterWithName:@"CIAffineClamp"];[clampFiltersetValue:[NSValuevalueWithBytes:&transformobjCType:@encode(CGAffineTransform)]forKey:@"inputTransform"];下一行clampFilter.setValue(transform,forKe