iphone - 检查 NSString 是否为 Integer

Question

Possible Duplicate:
NSString is integer?

我想看看字符串是否只是数字。基本上:

if (string is integer):
   #do whatever
else:
   #error

我该怎么做？谢谢!

Answer 1

我使用了[NSCharacterSet十进制数字字符集]。绝对运作良好。

NSCharacterSet* notDigits = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];

if ([newString rangeOfCharacterFromSet:notDigits].location == NSNotFound)
{
// newString consists only of the digits 0 through 9
}