Cannot get text from UITextField - Swift - iOS

问题

I have an iOS app written in Swift. I am struggling to get the text from the UITextField because my app crashes on this line of code:

let dataUser = self.userField.text

I get the following crash report:

fatal error: unexpectedly found nil while unwrapping an Optional value

What am I doing wrong?... all I want to do is get the text from the text field.

Thanks, Dan.

回答1:

Check in Interface Builder that your UITextField is properly linked to your "userField" IBOutlet: your UITextField, self.userField, is probably not hooked to the IBOutlet, so the object is nil and it crashes when trying to access its .text property.

回答2:

In swift 2.0 the text value of UITextField became optional.

So check if exists first:

guard let text = self.userField.text else {
  print("ooops")
  return
}

let dataUser = text

来源：https://stackoverflow.com/questions/33129347/cannot-get-text-from-uitextfield-swift-ios