title: becomeFirstResponder not working!
body: <p>In the below code becomeFirstResonder not working, only resignFirstresponder working...can anyone please help</p>
  
  <pre><code>- (BOOL)textFieldShouldReturn:(UITextField *)textField {
  
  
  if (textField == txtDate)
  {
  [txtDate resignFirstResponder];
  [txtTime becomeFirstResponder];
  
  }
  if (textField == txtTime)
  {
  [txtTime resignFirstResponder];
  [txtAddress becomeFirstResponder];
  
  }
  if (textField == txtAddress)
  {
  [txtAddress resignFirstResponder];
  [txtCity becomeFirstResponder];
  }
  if (textField == txtCity)
  {
  [txtCity resignFirstResponder];
  [txtState becomeFirstResponder];
  
  }
  if(textField == txtState)
  {
  
  [txtState resignFirstResponder];
  [txtZip becomeFirstResponder];
  
  }
  if (textField == txtZip)
  {
  [txtZip resignFirstResponder]; 
  
  }
  
  return NO;
  }
  
  
  - (BOOL)textFieldShouldEndEditing:(UITextField *)textField
  {
  
  if(textField == txtDate)
  
  {
  NSString *dateString = txtDate.text;
  NSString *dateRegex = @"^(1[0-2]|0[1-9])/(3[01]|[12][0-9]|0[1-9])/[0-9]{4}$"; 
  
  NSPredicate *dateTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", dateRegex]; 
  
  BOOL validateDate = [dateTest evaluateWithObject:dateString];
  
  
  if(!validateDate){
  
  
  UIAlertView *alert2 = [[UIAlertView alloc] initWithTitle:nil message:@"Date Error." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
  [alert2 show];
  [alert2 release];
  txtDate.text = nil;
  
  }
  
  
  }
  
  
  if(textField == txtTime) 
  
  {
  
  
  NSString *timeString = txtTime.text;
  NSString *timeRegex = @"^(([0]?[0-5][0-9]|[0-9]):([0-5][0-9]))$"; 
  
  NSPredicate *timeTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", timeRegex]; 
  
  BOOL validateTime = [timeTest evaluateWithObject:timeString];
  
  if(!validateTime) {
  
  UIAlertView *alert2 = [[UIAlertView alloc] initWithTitle:nil message:@"Incorrect Time Entry." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
  [alert2 show];
  [alert2 release];
  
  txtTime.text = nil;
  
  }
  
  }
  
  
  
  if(textField == txtAddress)
  
  {
  
  NSString *addressString = txtAddress.text;
  NSString *addressRegex = @"^[a-z0-9 ]+$"; 
  
  NSPredicate *addressTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", addressRegex]; 
  
  BOOL validateAddress = [addressTest evaluateWithObject:addressString];
  
  if(!validateAddress) {
  
  UIAlertView *alert2 = [[UIAlertView alloc] initWithTitle:nil message:@"Incorrect State." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
  [alert2 show];
  [alert2 release];
  
  
  txtAddress.text = nil;
  
  }   
  
  
  }
  
  
  
  
  if(textField == txtState)
  
  {
  
  NSString *stateString = txtState.text;
  NSString *stateRegex = @"^(?-i:A[LKSZRAEP]|C[AOT]|D[EC]|F[LM]|G[AU]|HI|I[ADLN]|K[SY]|LA|M[ADEHINOPST]|N[CDEHJMVY]|O[HKR]|P[ARW]|RI|S[CD]|T[NX]|UT|V[AIT]|W[AIVY])$";
  
  NSPredicate *stateTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", stateRegex]; 
  
  BOOL validateState = [stateTest evaluateWithObject:stateString];
  
  if(!validateState) {
  
  UIAlertView *alert2 = [[UIAlertView alloc] initWithTitle:nil message:@"Incorrect State." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
  [alert2 show];
  [alert2 release];
  
  txtState.text = nil;
  
  }   
  
  
  }
  
  
  
  if(textField == txtCity)
  
  {
  NSString *cityString = txtCity.text;
  NSString *cityRegex = @"^[a-z ]+$"; 
  
  NSPredicate *cityTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", cityRegex]; 
  
  BOOL validateCity = [cityTest evaluateWithObject:cityString];
  
  if(!validateCity) {
  
  UIAlertView *alert2 = [[UIAlertView alloc] initWithTitle:nil message:@"Incorrect City." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
  [alert2 show];
  [alert2 release];
  
  txtCity.text = nil;
  
  }
  
  
  }
  
  
  
  if(textField == txtZip)
  
  {
  NSString *zipString = txtZip.text;
  NSString *zipRegex = @"^[0-9]{5}([- /]?[0-9]{4})?$"; 
  
  NSPredicate *zipTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", zipRegex]; 
  
  BOOL validateZip = [zipTest evaluateWithObject:zipString];
  
  if(!validateZip) {
  
  UIAlertView *alert2 = [[UIAlertView alloc] initWithTitle:nil message:@"Incorrect Zip." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
  [alert2 show];
  [alert2 release];
  
  txtZip.text = nil;
  }
  
  
  }
  
  return NO;
  
  
  
  }
  </code></pre>