更改NSNumber的值 [英] Changing value of a NSNumber
本文介绍了更改NSNumber的值的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
是否可以在创建NSNumber后更改它的值而不指向另一个NSNumber?
Is there a way to change the value contained in an NSNumber after it is created without making it point to a different NSNumber?
NSNumber *num = [NSNumber numberWithInt:0];
num = [NSNumber numberWithInt: 1]; // now num points to a different object, which I don't want. I want it the same object still, but different value.
推荐答案
NSNumber是不可变的.实际上，它是NSValue的子类，并且所有NSValue都是不可变的.
NSNumber is immutable. Actually, it's a subclass of NSValue, and all NSValues are immutable.
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