//判斷是否為整形：

- (BOOL)isPureInt:(NSString*)string{

    NSScanner* scan = [NSScannerscannerWithString:string];

   int val;

   return[scan scanInt:&val] && [scanisAtEnd];

}

//判斷是否為浮點(diǎn)形：

- (BOOL)isPureFloat:(NSString*)string{

    NSScanner* scan = [NSScannerscannerWithString:string];

   float val;

   return[scan scanFloat:&val] && [scanisAtEnd];

}