我必须存档一个值为INFINITY的float，然后再将其取消存档。这是我的示例代码:要归档的对象:@interfaceCodeInf:NSObject@end@implementationCodeInf-(void)encodeWithCoder:(NSCoder*)encoder{floatinf=INFINITY;[encoderencodeFloat:infforKey:@"INFINITY"];}-(id)initWithCoder:(NSCoder*)decoder{if(self=[superinit]){floatdecodedInf=[decoderdecodeFlo