UIBarButtonItem在调用时未在另一个类中调用函数

Question

我试图将大部分代码移动到另一个文件;我相信我已经做到了，但是，我在调用函数时遇到了问题。

我有两个文件：

scannerBrain.swift

var parentView = UIViewController() 

func startScan(){ 
//The code I want to execute is here 
} 

scannerViewController.swift

let scanner = scannerBrain() 
scanner.parentView = self 
let rightButton = UIBarButtonItem(barButtonSystemItem: .add, target: scanner, action: #selector(scanner.startScan)) 
navigationItem.rightBarButtonItem = rightButton 

编译没有问题，除了startScan不会被调用。我试图改变rightButton的目标self，但造成的unrecognised selector sent to instance

崩溃感谢所有帮助

Answer 1

scanner应该是一流水平的财产，否则将被释放。像这样的东西。

class TestViewController: UIViewController { 

    let scanner = scannerBrain() 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     scanner.parentView = self 
     let rightButton = UIBarButtonItem(barButtonSystemItem: .add, target: scanner, action: #selector(scanner.startScan)) 
     navigationItem.rightBarButtonItem = rightButton 
    } 
}