Question

I am developing an iphone application in which i have to return keyboard as soon as i type only one character in textfield. How to achieve this please suggest some solution.

Thanks.

Answer 1

Step 1: Create a class implementing the protocol UITextFieldDelegate

@interface TheDelegateClass : NSObject <UITextFieldDelegate>

Step 2: In your implementation, override the method – (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    // newString is what the user is trying to input.
    NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];
    if ([newString length] < 1) {
        // If newString is blank we will just ingore it.
        return YES;
    } else
    {
        // Otherwise we cut the length of newString to 1 (if needed) and set it to the textField.
        textField.text = [newString length] > 1 ? [newString substringToIndex:1] : newString;
        // And make the keyboard disappear.
        [textField resignFirstResponder];
        // Return NO to not change text again as we've already changed it.
        return NO;
    }
}

Step 3: Set an instance of the delegate class as the delegate of the UITextField.

TheDelegateClass *theDelegate = [[TheDelegateClass alloc] init];
[theTextField setDelegate:theDelegate];