"No Method Declared with Objective-C Selector 'playPause:'" & "Use of Unresolved Identifier UIBarButtonItem"

Question

I'm Making a music player and I'm not sure why I'm getting this error in my code. I'm new to coding and would highly appreciate some help (This is the image of the code)

Answer 1

你写错了，把UIBarButtonItem.play换成UIBarButtonSystemItem.play