你可以使用 C函数用于计算对数

You can use the C functions for calculating logarithms

#import <math.h>
double myLog = log(10);

您还可以在此处看到： Objective-c / cocoa-touch中有哪些对数函数/方法？

You can also see here: What kind of logarithm functions / methods are available in objective-c / cocoa-touch?