How to open the keyboard automatically on UITextField?

问题

I have a very simple table and when tocuh a cell it opens a new view with one UITextfield. All I want is that the keyboard will automatically opens, without the user have to touch the UITextfield.

Its all done in Interface Builder, so I am not sure how I do this. I guess I need to set the focus at some point ?

Thanks

回答1:

To cause the keyboard to show up immediately you'll need to set the text field as the first responder using the following line:

[textField becomeFirstResponder];

You may want to place this in the viewDidAppear: method.

回答2:

Swift 3 & 4:

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    textField.becomeFirstResponder()
}

回答3:

Prefer adding the first responder on the main thread -

 override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    DispatchQueue.main.async {
        self.textField.becomeFirstResponder()
    }
}

This will come in handy when view controller view is added as a subview.

来源：https://stackoverflow.com/questions/2273470/how-to-open-the-keyboard-automatically-on-uitextfield