Question

If I tap an image,can I pop up the UITextfield for entering the data? How would I do that?

Answer 1

You could use a UIAlertView as follows:

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Title"
                                                message:@"Please enter your text:"
                                               delegate:self
                                      cancelButtonTitle:@"Done"
                                      otherButtonTitles:nil];

alert.alertViewStyle = UIAlertViewStylePlainTextInput;
UITextField *textField = [alert textFieldAtIndex:0];
textField.keyboardType = UIKeyboardTypeDefault;
textField.placeholder = @"Enter some text";

[alert show];

Edit: to handle the returned text, implement the delegate method

- (void)alertView:(UIAlertView *)alert clickedButtonAtIndex:(NSInteger)buttonIndex {
    if(buttonIndex > 0) {
        UITextField *textField = [alert textFieldAtIndex:0];
        NSString *text = textField.text; 
        if(text == nil) { 
            return; 
        } else { 
            //do something with text 
        } 
    } 
}