######A控制器
import UIKit
class ViewController: UIViewController,NextViewControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
let btn = UIButton(frame: CGRect(x: 0, y: 100, width: 100, height: 100));
btn.backgroundColor = UIColor.red;
self.view.addSubview(btn)
btn.addTarget(self, action:#selector(pushclick), for: UIControlEvents.touchUpInside)
}
@objc func pushclick() {
let vc = NextViewController()
vc.titlestring = "哈哈"
vc.delegate = self;
self.navigationController?.pushViewController(vc, animated: true)
// 设置代理，遵守协议，实现协议方法
}
func change(title:String){
self.view.backgroundColor = UIColor.purple
self.title = "xuxuuxux"
}
}
######B控制器
import UIKit
protocol NextViewControllerDelegate:NSObjectProtocol{
func change(title:String)
}
class NextViewController: UIViewController {
var titlestring: String?
weak var delegate: NextViewControllerDelegate?
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = UIColor.yellow
self.title = titlestring
let btn = UIButton(frame: CGRect(x: 0, y: 100, width: 100, height: 100));
btn.backgroundColor = UIColor.red;
self.view.addSubview(btn)
btn.addTarget(self, action:#selector(popclick), for: UIControlEvents.touchUpInside)
}
@objc func popclick() {
delegate?.change(title: "hahahahha");
self.navigationController?.popViewController(animated: true)
}
}
创建通知中心
设置监听方法
设置通知的名字
NotificationCenter.default.addObserver(self, selector: #selector(test), name: NSNotification.Name(rawValue:"isTest"), object: nil)
实现通知监听方法
@objc func test(nofi : Notification){
let str = nofi.userInfo!["post"]
print(String(describing: str!) + "this notifi")
}
点击发送通知进行
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
NotificationCenter.default.post(name: NSNotification.Name("isTest"), object: self, userInfo: ["post":"NewTest"])
}
最后要记得移除通知
deinit {
/// 移除通知
NotificationCenter.default.removeObserver(self)
}
