How to open the keyboard automatically on UITextField?

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.

Swift 3 & 4:

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

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