如何转换和比较NSNumber到BOOL？(How to convert and compare NSNumber to BOOL?)

 首先，将BOOL值转换为NSNumber，以便将其放入NSUserDefaults。 稍后我想从NSUserDefaults中检索BOOL值，但显然我得到NSNumber而不是BOOL。 我的问题是 
 
 
 
 如何从NSNumber转换回BOOL？ 
 
 
 如何将NSNumber与BOOL值进行比较。 
 
 
 目前我有： 
 
if (someNSNumberValue == [NSNumber numberWithBool:NO]) {
    do something
}
 
 有什么比较好的方法吗？ 
 
 谢谢！ 

First I convert BOOL value to NSNumber in order to put it into NSUserDefaults. Later I would like to retrieve the BOOL value from the NSUserDefaults, but obviously I get NSNumber instead of BOOL. My questions are? 
 
 
 
how to convert back from NSNumber to BOOL? 
 
 
How to compare NSNumber to BOOL value.
 
 
Currently I have:
 
if (someNSNumberValue == [NSNumber numberWithBool:NO]) {
    do something
}
 
any better way to to the comparison?
 
Thanks!

原文：https://stackoverflow.com/questions/2478984