返回到以前的控制器，而无需在iOS上单击- Swift

self.navigationController?.popViewController(animated: true)

self.dismiss(animated: true, completion: nil)

protocol MyDelegate: class {
    func goBack()
}

class PreviousViewController: UIViewController, MyDelegate {
    // ...
    func goBack() {
        // 返回到上一个控制器的逻辑
    }
    // ...
}

weak var delegate: MyDelegate?

func goBackButtonPressed() {
    delegate?.goBack()
}