Swift: unexpectedly found nil while unwrapping an Optional value when setting delegate for UITextField object

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I writing a single-viewed app. It has one UITextField and one MKMapView. I want to do something when Return key is hit, so I basically followed

How to hide keyboard in swift on pressing return key?

But it does fit while with my other codes. Any idea why it isn't working and how to fix it?

asked 37 secs ago

wandonye

29

Swift: unexpectedly found nil while unwrapping an Optional value when setting delegate for UITextField object