键盘出现时快速移动视图

Question

I have six UITextFields in my view and I want to decide whether the view has to move or not. How can I check which TextField is selected before moving my view?

Thats my Code for showing the keyboard and moving the view:

    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil)
        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil)

func keyboardWillShow(notification: NSNotification) {
            if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
                self.view.frame.origin.y -= keyboardSize.height - 85
            }
    }

    func keyboardWillHide(notification: NSNotification) {
            if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
                self.view.frame.origin.y += keyboardSize.height - 85
            }
    }

Answer 1

If you want to know which UITextField is selected, you can use textFieldDidBeginEditing and textFieldDidEndEditing

func textFieldDidBeginEditing(textField: UITextField!) {
    currentSelectedTextField = textField
}

func textFieldDidEndEditing(textField: UITextField!) {
    currentSelectedTextField = nil
}

For your reference about how to manage keyboard when selecting a UITextField : https://developer.apple.com/library/ios/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/KeyboardManagement/KeyboardManagement.html