如何使用通知将字符串数据从 swift 传递到 objective c class

Question

我想将 table 单元格文本标签数据从 swift class 传递到 objective c class。在 swift class 中，我做了以下操作，

class NewsViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
@IBOutlet weak var newsTableView: UITableView!

var myVC:NewsDetailsViewController!
}

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    tableView.deselectRow(at: indexPath, animated: true)
    print("selected index :",indexPath.row)

    let selectedCell = tableView.cellForRow(at: indexPath)
    print("did select and the text is \(selectedCell?.textLabel?.text)")
    myVC.passedValue = selectedCell?.textLabel?.text
    print("text label value: ", myVC.passedValue)
    NotificationCenter.default.post(name: NSNotification.Name(rawValue: "PostQuestion"), object: myVC.passedValue)
    self.present(myVC, animated: true , completion: nil)

}

现在我想用我的另一个控制器接收这个字符串数据，它是 objective c class。请指导。

Answer 1

您应该使用

发送您的通知

NotificationCenter.default.post(name: NSNotification.Name(rawValue: "PostQuestion"), 
    object: self,
    userInfo: ["value": myValue] as Dictionary<AnyHashable, Any>)

并用类似

的方式处理通知

func processNotification(notification: NSNotification) {
    let userInfo = notifcation.userInfo

    if let value = userInfo?["value"] as? String {
        ...
    }
}

或Objective-C

中相同

- (void)processNotification:(NSNotification *)notification {
    NSString *value = [notifcation.userInfo objectForKey:@"value"]

    if(value) {
        ...
    }
}

如何使用通知将字符串数据从 swift 传递到 objective c class

how to pass string data from swift to objective c class using notification

objective-c

viewcontroller

nsnotificationcenter

ios

swift