判断UITextField的输入只为数字的方法

来源：互联网发布：unity3d 在线更新编辑：程序博客网时间：2024/05/14 17:14

实现下面的委托

#define NUMBERS @"0123456789\n"

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSCharacterSet *cs;
if(textField == phoneNumberField)
{
      cs = [[NSCharacterSet characterSetWithCharactersInString:NUMBERS] invertedSet];
      NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
      BOOL basicTest = [string isEqualToString:filtered];
      if(!basicTest)
      {
         UIAlertView* alert = [[UIAlertView alloc] initWithTitle:@"提示"
                                                         message:@"请输入数字"
                                                         delegate:nil
                                                cancelButtonTitle:@"确定"
                                                otherButtonTitles:nil];

         [alert show];
         [alert release];
         return NO;
      }
}

//其他的类型不需要检测，直接写入
return YES;
}
如果输入的不是数字，进行提示。