Question

在我的应用中，我会在用户执行某项操作后推送本地通知当用户从推送通知中打开应用程序时，我想将一个事件注册到跟踪系统（在我的情况下是 Mixpanel ）。我应该有一个密钥来注册我从服务器上获取此事件的事件。

所以我想做的是在函数中获取密钥，在此函数完成后，我想注册该事件。

我尝试了performSelectorOnMainThread:withObject:waitUntilDone:，但它无效

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    //some code here
    [self performSelectorOnMainThread:@selector(performHandShake)
                           withObject:nil
                        waitUntilDone:YES];
    [self performSelectorOnMainThread:@selector(registerLaunchOptionsDetails:) 
                           withObject:launchOptions
                        waitUntilDone:YES];
    //some code here
}

-(void)performHandShake
{
   //myParams here

    [[RKClient sharedClient] get:@"/handshake" usingBlock:^(RKRequest *request) {
        request.params = [RKParams paramsWithDictionary:myParams];
        request.method = RKRequestMethodGET;

        request.onDidLoadResponse = ^(RKResponse *response) {
            //Set the tracking key here 
        };

        request.onDidFailLoadWithError = ^(NSError *error) {
            NSLog(@"ERROR:%@",error);
        };
    }];
}

-(void)registerLaunchOptionsDetails:(NSDictionary *)launchOptions
{
    UILocalNotification *localNotification = [launchOptions objectForKey: UIApplicationLaunchOptionsLocalNotificationKey];

    if (localNotification) {
       //Register the event here using the key 
    }
 }

问题是在registerLaunchOptionsDetails完成之前执行的performHandShake功能且事件未被注册。

Answer 1

对于您想要做的事情可能有点过分，但是有一个类似于节点的异步的库。您可以将异步任务链接在一起和/或等到多个完成后再执行其他操作。

ReactiveCocoa

Answer 2

执行-[RKClient get:usingBlock]时，它将创建一个将在后台执行的网络操作，该方法将返回。

这将清除registerLaunchOptionsDetails运行的路径，这将在网络操作完成之前发生。

当网络操作成功完成并且您拥有所请求的数据时，request.onDidLoad将运行。这就是调用registerLaunchOptionsDetails:的原因。

Answer 3

我们会在您需要时调用阻止request.onDidLoadResponse，因此您需要从此阻止中调用registerLaunchOptionsDetails:。不要忘记通过launchOptions将performHandShake传递给此块并创建对self的弱引用，以防止它在块中保留。最终代码应该是这样的：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    //some code here

    [self performSelectorOnMainThread:@selector(performHandShake:) withObject:launchOptions waitUntilDone:YES];


    //some code here

}

-(void)performHandShake:(NSDictionary *)launchOptions
{
    //myParams here

        [[RKClient sharedClient] get:@"/handshake" usingBlock:^(RKRequest *request){

        request.params = [RKParams paramsWithDictionary:myParams];
        request.method = RKRequestMethodGET;

        __weak AppDelegate *weakSelf = self;
        request.onDidLoadResponse = ^(RKResponse *response)
        {

            //Set the tracking key here

            // Here is registerLaunchOptionsDetails: call
            [weakSelf registerLaunchOptionsDetails:launchOptions];
        };

        request.onDidFailLoadWithError = ^(NSError *error)
        {
            NSLog(@"ERROR:%@",error);
        };
    }];

}

-(void)registerLaunchOptionsDetails:(NSDictionary *)launchOptions
{

    UILocalNotification *localNotification = [launchOptions objectForKey: UIApplicationLaunchOptionsLocalNotificationKey];

    if (localNotification)
    {
        //Register the event here using the key 


    }
}

仅在第一个功能完成后执行功能 - ios

3 个答案: