下面是我的代码,我正在关注在线教程,但遇到上述错误。
import UIKit
import MultipeerConnectivity
class ViewController: UIViewController, MCBrowserViewControllerDelegate {
@IBOutlet var xField: [MyImageView]!
var appDelegate:AppDelegate!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
appDelegate = UIApplication.shared.delegate as? AppDelegate
appDelegate.mpcHandling.gettingPeerConnection(displayName: UIDevice.current.name)
appDelegate.mpcHandling.gettingSession()
appDelegate.mpcHandling.showingSelf(show: true)
//handling peer state notification
//getting error for the below mentioned line
NotificationCenter.default.addObserver(self, selector: #selector("peerChangedNotification:"), name: NSNotification.Name(rawValue: "MPC_DidChangeStateNotification"), object: nil)
NotificationCenter.default.addObserver(self, selector: Selector("handleReceivedNotification:"), name: NSNotification.Name(rawValue: "MPC_DidReceiveNotification"), object: nil)
mainLogicField()
}
@objc func peerChangedNotification(notification:NSNotification){
let userInfo = NSDictionary(dictionary: notification.userInfo!)
let state = userInfo.object(forKey: "state") as! Int
if state != MCSessionState.connecting.rawValue{
//Now we inform user that we have connected
self.navigationItem.title = "Connected Successfully"
}
}
@IBAction func getConnected(_ sender: Any) {
if appDelegate.mpcHandling.gameSession != nil {
appDelegate.mpcHandling.gettingBrowser()
appDelegate.mpcHandling.browser.delegate = self
self.present(appDelegate.mpcHandling.browser, animated: true, completion: nil
)
}
}
func mainLogicField() {
for index in 0 ... xField.count - 1 {
let recognizeGestureTouch = UITapGestureRecognizer(target: self, action: "fieldTapped")
recognizeGestureTouch.numberOfTapsRequired = 1
xField[index].addGestureRecognizer(recognizeGestureTouch)
}
}
func browserViewControllerDidFinish(_ browserViewController: MCBrowserViewController) {
appDelegate.mpcHandling.browser.dismiss(animated: true, completion: nil)
}
func browserViewControllerWasCancelled(_ browserViewController: MCBrowserViewController) {
appDelegate.mpcHandling.browser.dismiss(animated: true, completion: nil)
}
}
由于我在函数中也使用了#selector和@objc,因此不确定出什么问题。 在线教程只是使用了NotificationCenter.default.addObserver(自身,选择器:“ peerChangedNotification:”,名称:NSNotification.Name(原始值:“ MPC_DidChangeStateNotification”),对象:无) 而不添加#selector,但是如果我删除#selector,它会给我一个警告,指出“没有用Objective-C选择器'peerChangedNotification'声明的方法”。 我正在尝试使用mutipeer连接两个设备
答案 0 :(得分:0)
Selector()::它接收string / string-literal作为参数。以前使用过,#selector
是升级的定义。
#selector:您正在尝试在#selector
中传递字符串,而该字符串需要使用Objective-C类型的函数引用。正确的例子是:
NotificationCenter.default.addObserver(self, selector: #selector(peerChangedNotification(notification:)), name: NSNotification.Name("MPC_DidChangeStateNotification"), object: nil)