iOS 版本号大小比较

NSString *num1 = @"5.2.0";    NSString *num2 = @"5.3.0";    

if ([num1 compare:num2 options:NSNumericSearch] ==NSOrderedDescending)   

{        

ULog(@"%@ is bigger",num1);    

}

else    {        

ULog(@"%@ is bigger",num2);    

}

解释：

NSOrderedDescending是降序，如果numb1>numb2用这个函数相比较那么就等于降序