TableView

ViewController前往MyViewController：

在MyViewController中定义CustomBlock，并在输入1时触发回调：

import UIKit

class MyViewController: UIViewController ,UITextViewDelegate{

var CustomBlock:((_ originString:String,_ curInput:String)->())?

var myInput:UITextView?

override func viewDidLoad() {

super.viewDidLoad()

view.backgroundColor = .white

myInput = UITextView.init(frame: CGRect(x: 20, y: 40, width: 200, height: 200))

myInput?.backgroundColor = .lightGray

myInput?.delegate = self

view.addSubview(myInput!)

}

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {

if text == "1" {

if CustomBlock != nil {

CustomBlock!(textView.text,text)

}

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

}

return true

}

}

在ViewController跳转时实现此Block：

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

let vc:MyViewController = .init()

vc.CustomBlock = {originString,curInputString in

print(String(format: "总字符串：%@，当前输入字符串为：%@", originString,curInputString))

}

self.present(vc, animated: true, completion: nil)

}

加油～