I am making a phone number recognition app based off of

should look like this:

(Ignore the "Module: qt122022" -- it will auto-fill with the name of your project. Mine just happens to be named qt122022.)

CodePudding user response：

Check the connection inspector in your storyboard or xib and check if previewView if it has a single reference, it may be that you have more than one or in any case no reference to your IBOulet