iOS判断NSString是否为纯数字

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//判断是否为整形
- (BOOL)stringIsPureNumber:(NSString*)string {
  NSScanner* scan = [NSScanner scannerWithString:string];
  int val;
  return [scan scanInt:&val] && [scan isAtEnd];
}
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 //判断是否为浮点型
- (BOOL)floatIsPureFloat:(NSString*)string {
  NSScanner* scan = [NSScanner scannerWithString:string];
  float val;
  return [scan scanFloat:&val] && [scan isAtEnd];
}