检查NSString是整数还是双精度-checkiftheNSStringisintegerordouble

8  

First, try [NSScanner scanInt:]&& [NSScanner isAtEnd]. If it returns YES, then you have an int. scanInt will scan forward as long as it can interpret the stream as an int. If isAtEnd is YES, then the entire string could be interpreted as an int (so you have an int).

首先，尝试[NSScanner:]& [NSScanner isAtEnd]。如果它返回YES，那么您有一个int. scanInt将扫描，只要它能将流解释为int，如果isAtEnd是YES，那么整个字符串可以被解释为int(所以您有一个int)。

Otherwise, try [NSScanner scanDouble:]. If it returns YES, then you have a double.

否则,尝试[NSScanner scanDouble:]。如果它返回YES，那么你有一个double。

If both return NO, then you don't have either.

如果两者都返回NO，那么两者都没有。