如何知道哪个UITextField在响应？

Question

In the UIViewController I add itself as observer:

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];

    ......
}

- (void)keyboardWillShow:(NSNotification *)notification {

    NSDictionary *userInfo = [notification userInfo];
    NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGRect keyboardRect = [aValue CGRectValue];

    if (textField1.isFirstResponder) {
        NSLog(@"I am here1");
    }

    if (textField2.isFirstResponder) {
        NSLog(@"I am here2");
    }

     ........

}

I also create five UITextField in the controller. My problem is how to know which textField is called. I try the method to find out whose "isFirstResponder" have change , but it is not working.

Answer 1

erm... why don't you use -textFieldDidBeginEditing: of UITextFieldDelegate

-(void)textFieldDidBeginEditing:(UITextField *)textField
{
    NSLog(@"%@",textField);
}

Answer 2

Use the tag property!! When you create your Textfield set their tags (to some textfield-specific number), and when you get the notification, simply check which tag they have!

Answer 3

尝试使用UIKeyboardDidShowNotification而不是UIKeyboardWillShowNotification。