如何增加一个NSNumber [英] How to increment a NSNumber

问题描述

如何增加NSNumber?

How do I increment a NSNumber?

即myNSNumber ++

i.e. myNSNumber++

推荐答案

更新:仅供参考，我个人更喜欢BoltClock和DarkDusts的单行答案.它们更加简洁，不需要其他变量.

Update: FYI, I personally like BoltClock's and DarkDusts's one-line answers better. They're more concise, and don't require additional variables.

要递增NSNumber，您将必须获取其值，对其进行递增，然后将其存储在新的NSNumber中.

In order to increment an NSNumber, you're going to have to get its value, increment that, and store it in a new NSNumber.

例如，对于拥有整数的NSNumber:

For instance, for an NSNumber holding an integer:

NSNumber *number = [NSNumber numberWithInt:...];
int value = [number intValue];
number = [NSNumber numberWithInt:value + 1];

或者对于具有浮点数的NSNumber:

Or for an NSNumber holding a floating-point number:

NSNumber *number = [NSNumber numberWithDouble:...];
double value = [number doubleValue];
number = [NSNumber numberWithDouble:value + 1.0];

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