Apple Watch 与 iOS 应用程序通信一个新的 swift 项目与现有的 obj c 项目

Question

1) 我已经使用完整的 swift 项目（iOS app in swift 和 Apple Watch target in swift)

代码：

在InterfaceController.swift

@IBAction func buttonPressed() {
    let watchMessage = ["SiteName" : "Tech-recipes"]

    WKInterfaceController.openParentApplication(watchMessage, reply: { (reply:[NSObject : AnyObject]!, error: NSError!) -> Void in

        if let message = reply["Message"] as? String{
            println(message)
        }
    })
}

在AppDelegate.swift

func application(application: UIApplication!, handleWatchKitExtensionRequest userInfo: [NSObject : AnyObject]!, reply: (([NSObject : AnyObject]!) -> Void)!) {

    if let siteName = userInfo["SiteName"] as? String{
        reply(["Message":"Hello from \(siteName)"])
    }

}

输出："Hello from Tech-recipes"

2) 但是，当我想将 swift 中的 apple watch 目标集成到 obj-c 中的现有项目时，它会崩溃并给我这个错误："fatal error: unexpectedly found nil while unwrapping an Optional value"

在InterfaceController.swift

@IBAction func buttonPressed() {
    let watchMessage = ["SiteName" : "Tech-recipes"]

    WKInterfaceController.openParentApplication(watchMessage, reply: { (reply:[NSObject : AnyObject]!, error: NSError!) -> Void in

        if let message = reply["Message"] as? String{ //CRASH HERE!!!!
            println(message)
        }
    })
}

iPhoneAppDelegate.m

- (void)application:(UIApplication *)application handleWatchKitExtensionRequest:(NSDictionary *)userInfo reply:(void (^)(NSDictionary *))reply{

    // Performs task on phone here

    // Sending back a reply
    if ([[userInfo valueForKey:@"SiteName"] length]>0) {
        //NSMutableDictionary *reply = [[NSMutableDictionary alloc] init];
        [reply setValue:[NSString stringWithFormat:@"Hello from %@", [userInfo valueForKey:@"SiteName"]] forKey:@"Message"];
    }
}

更新：

--> 注意到在 handleWatchKitExtensionRequest: 方法中，userInfo 的类型在 swift 和 obj-c 中是不同的，在 [NSObject : AnyObject] 中！和 NSDictionary 分别。如何解决？

--> 错误中得到一个错误：NSError!: [0] (null) @"NSLocalizedDescription" : @"The UIApplicationDelegate in the iPhone App never called reply() in -[UIApplicationDelegate application:handleWatchKitExtensionRequest:reply:]"

Answer 1

解决了！

错过了应用委托中的回复（aNsdictionary）

Apple Watch 与 iOS 应用程序通信一个新的 swift 项目与现有的 obj c 项目

Apple watch communicate with iOS app a new swift project vs to existing obj c project

objective-c

swift

nsdictionary

apple-watch