Question

我有一个带有objective-c类和swift类的项目。现在，我需要发布来自objective-c类的通知：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    // Here I present swift view controller
    CollectionViewController *cvc = [[CollectionViewController alloc] initWithNibName:@"CollectionViewController" bundle:nil];
    UINavigationController *controller = [[UINavigationController alloc] initWithRootViewController:cvc];
    [self.navigationController presentViewController:controller animated:YES completion:nil];

    [[NSNotificationCenter defaultCenter] postNotificationName:@"BuildingReady" object:self userInfo:[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:chosenBuilding, nil] forKeys:[NSArray arrayWithObjects:@"chosenBuilding", nil]]];
}

我正在swift课程中听到这个通知：

import UIKit

@objc class CollectionViewController : UIViewController, UICollectionViewDataSource, UICollectionViewDelegate , UICollectionViewDelegateFlowLayout {

   override func viewDidLoad() {
      super.viewDidLoad()

      NSNotificationCenter.defaultCenter().addObserver(self, selector: "getBuilding:", name: "BuildingReady", object: nil)
   }

   func getBuilding(notification: NSNotification) {
        let userInfo: Dictionary<String, Building!> = notification.userInfo as! Dictionary<String, Building!>

        self.chosenBuilding = userInfo["chosenBuilding"]
   }

问题是在swift类中我从未捕获到我的通知（func getBuilding从未被调用过）。可能存在一个对象是客观c类而第二个是快速类的问题吗？

Answer 1

尝试这样的事情：

dispatch_async(dispatch_get_main_queue(), ^{
    [[NSNotificationCenter defaultCenter] postNotificationName:@"BuildingReady" object:self userInfo:[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:choosedBuilding, nil] forKeys:[NSArray arrayWithObjects:@"choosedBuilding", nil]]];
});

Objective-c class和swift class

1 个答案: