在 Swift Class returns 中访问 Objective C AppDelegate 字符串 nil

Question

我正在尝试从我的 ObjectiveC AppDelegate in/using a Swift class 访问 NSNumber 值，但是它在 Swift 上连续 returns nil事情的一面 - 但是它填充在 Objective C class 中（我相信这是由于我在 Swift 中调用它的方式 - 即使它是使用代码完成找到的 - 对于一些原因是它在两者之间经过时仍然会迷路）。

如有任何建议，我们将不胜感激。

Objective C AppDelegate.m:

...

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)notification
{
    theNotification = notification;
    NSDictionary *aps = (NSDictionary *)[notification objectForKey:@"aps"];
    NSNumber *chatId = [aps objectForKey:@"chatId"];

    }

    ...

Objective C AppDelegate.h:

... 

@property (nonatomic) NSNumber* chatId;

...

Swift:

 class func clientChatSendMessage(_ chatId: NSNumber, message: String, completionHandler: @escaping (Data?, NSError?) -> ()) -> URLSessionTask {


    let oCchatId: AppDelegate = AppDelegate()
    let chatSessionId:NSNumber  = oCchatId.chatId

Answer 1

在您的代码中创建新变量 NSNumber *chatId = [aps objectForKey:@"chatId"];

试试这个：

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)notification
{
    theNotification = notification;
    NSDictionary *aps = (NSDictionary *)[notification objectForKey:@"aps"];
    self.chatId = [aps objectForKey:@"chatId"];

}

编辑

正如 Caleb 在评论中所说

I think the new instance of AppDelegate is also a problem. It should be accessed with UIApplication.shared.delegate.chatId

所以你也需要改变这个

class func clientChatSendMessage(_ chatId: NSNumber, message: String, completionHandler: @escaping (Data?, NSError?) -> ()) -> URLSessionTask {


    let oCchatId: AppDelegate = UIApplication.shared.delegate() as! AppDelegate
    let chatSessionId:NSNumber  = oCchatId.chatId

在 Swift Class returns 中访问 Objective C AppDelegate 字符串 nil

Accessing Objective C AppDelegate String in Swift Class returns nil

ios

objective-c

swift

nsnumber

Objective C AppDelegate.m:

Objective C AppDelegate.h:

Swift: