Post UITextfield integer values to web server

Question

I have a UITextField and in that I should be able to type only integers (no text) and after that the integer values have to be passed to an NSMutableDictionary. Then from this dictionary I have to post to webserver.

Answer 1

Change the keyboard type of UITextField to Number Pad so it only takes numbers:

[textField setKeyboardType:UIKeyboardTypeNumberPad];

You can also check whether the text entered is a number or not:

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    if (string.length == 0 || [NSScanner scanInt:string]) {
        return YES;
    }

    return NO;
}

You can save the value in dictionary by using following code:

//if you want to save as number
[myDictionary setObject:[NSNumber numberWithInt:[textField.text intValue] forKey:@"YourKey"];

OR

//if you want to save as string
[myDictionary setObject:textField.text forKey:@"YourKey"];

Answer 2

//Create a textfield

    txt = [[UITextField alloc] initWithFrame:CGRectMake(100, 10, 150, 50)];
    txt.placeholder = @"enter here";
    txt.borderStyle = UITextBorderStyleRoundedRect;
    txt.autocorrectionType = UITextAutocorrectionTypeNo;
    [txt setClearButtonMode:UITextFieldViewModeWhileEditing];
    [txt setKeyboardType:UIKeyboardTypeNumberPad];
    txt.delegate=self;

    [cell.contentView addSubview:txt];

You could check whether entered text is number or not:

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSString *newString = [Height.text stringByReplacingCharactersInRange:range withString:string];
if([newString length] > 3)
{
    UIAlertView *obj_AlertView=[[UIAlertView alloc]initWithTitle:@""
                                                         message:@"Enter 3 digit only"
                                                        delegate:self
                                               cancelButtonTitle:@"OK"
                                               otherButtonTitles:nil];
    [obj_AlertView show];
}
    return !([newString length] > 3);


 }

now create a NSMutabledictionary in your button action to post

 -(IBAction)btnClicked:(id)sender
 {
  UIButton *button = (UIButton *)sender;
  button.tintColor=[UIColor redColor];
  NSLog(@"%@",button);

  NSMutableDictionary *datadict=[NSMutableDictionary dictionary];

now pass your textfield value to nsmutabledictionary to post

  if (txt.text !=NULL) {


    [datadict setValue:[NSNumber numberWithInt:[txt.text intValue]] forKey:@"txt"];

    //    [datadict setObject:[NSString stringWithFormat:@"%@",txt.text] forKey:@"txt"];   (if it is for NSdictionary)

} else {

[datadict setObject:[NSString stringWithFormat:@" "] forKey:@"txt"];

}

now post the value to web-server

   NSData* jsonData = [NSJSONSerialization dataWithJSONObject:datadict options:kNilOptions error:nil];
   NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
  NSURL *someURLSetBefore =[NSURL URLWithString:@" your post web-server link here"];
  [request setURL:someURLSetBefore];
  [request setHTTPMethod:@"POST"];
  [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
  [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
  [request setHTTPBody:jsonData];
  NSError *error;
  NSURLResponse *response;
  NSData *responseData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
  NSString * string1=[[NSString alloc]initWithData:responseData encoding:NSUTF8StringEncoding];
   NSLog(@"%@",string1);

Answer 3

You can try something like this
1. Set the textField 'Keyboard Type' to Number Pad.

2.
NSMutableDictionary *dict=[[NSMutableDictionary alloc]init];
[dict setValue:[NSNumber numberWithInt:[textField.text intValue]] forKey:@"Key"];

Hope it helps.

Answer 4

This one is the best way to do such things, make this following lines in NSString Category and check a validation as per your need.

-(NSString *)isTextFieldHasNumberOnly

{

   NSString *strMessage;
     NSString *enteredText=[self trimWhiteSpace];
    if ([enteredText length]==0) 
    {
        strMessage=@"Please enter number.";
        return strMessage;
    }

    NSString *numbEx = @"^([0-9]+)?(\\.([0-9]{1,2})?)?$";

    NSRegularExpression *numbRegEx = [NSRegularExpression regularExpressionWithPattern:numbEx options:NSRegularExpressionCaseInsensitive error:nil];

    NSUInteger numberOfMatches = [numbRegEx numberOfMatchesInString:enteredText options:0 range:NSMakeRange(0, [enteredText length])];
    if (numberOfMatches == 0)
        strMessage=@"Please enter valid number.";
    else
        strMessage=@"";

    return strMessage;
}