user value in textfield become wrong while viewing - ios

Question

I am new to IOS i created textfield for enter value in integer.That integer convert into string then it can be passed to Post method and finally button action it can be viewed in alert view.if user given value to textfield means its value going wrong but constant value is given means its showing correct value i am struggling to get correct value when user enter in textfield.
Post method:
below coding showing post method with parameter(str)passing
-(void) sendDataToServer : (NSString *) method params:(NSString *)str{
NSData *postData = [str dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:#"%lu", (unsigned long)[str length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:URL]];
[request setHTTPMethod:#"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setHTTPBody:postData];
NSURLConnection *theConnection = [NSURLConnection connectionWithRequest:request delegate:self];
if( theConnection ){
mutableData = [[NSMutableData alloc]init];
}
}
picker view:
- (void) pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
if(pickerView.tag ==2){
txtText.text = (NSString *)[arrMsg objectAtIndex:row];
branchid1 = (NSString *)[arrmsg1 objectAtIndex:row];
NSLog([arrmsg1 objectAtIndex:row]);
}else if(pickerView.tag ==1){
currency1.text = (NSString *)[currencyname1 objectAtIndex:row];
currencyid1 = (NSString *)[id1 objectAtIndex:row];
NSLog([id1 objectAtIndex:row]);
}
else
{
currency2.text = (NSString *)[from_currency objectAtIndex:row];
currencyid2 = (NSString *)[id2 objectAtIndex:row];
NSLog([id2 objectAtIndex:row]);
}
//here i assign textfield value into string
fourthstr = [NSString stringWithFormat:#"%d",value1.text];
NSLog(#"%#",value1.text);
//here i created str as string to pass parameter to post method
str = [NSString stringWithFormat:#"branch_id=%#&from_curr=%#&to_curr=%#&value=%#",branchid1,currencyid1,currencyid2,fourthstr];
[self sendDataToServer :#"POST" params:str];
}