iphone - 异步或在后台注册 Apple 推送通知

Question

在我的应用程序中，我使用推送通知，在我看来注册推送的请求需要一段时间，这会阻止我的应用程序立即显示内容并且只显示黑屏，直到设备 token 返回。

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    ....

    NSLog(@"Registering for push notifications...");    
    [[UIApplication sharedApplication] 
     registerForRemoteNotificationTypes:
     (UIRemoteNotificationTypeAlert | 
      UIRemoteNotificationTypeBadge | 
      UIRemoteNotificationTypeSound)];

    ....

    return self;
}

我怎样才能异步或在后台执行此操作...因为如果屏幕保持黑色会使用户感到困惑...

问候

更新:根据我的代码要求

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    self.webViewCon = [[[WebViewController alloc] initWithNibName:@"WebView_iPhone" bundle:[NSBundle mainBundle]] autorelease];

    application.applicationIconBadgeNumber = 0;
    [window addSubview:[webViewCon view]];
    [self.window makeKeyAndVisible];

    // register for push
    NSLog(@"Registering for push notifications...");    
   [[UIApplication sharedApplication] 
     registerForRemoteNotificationTypes:
     (UIRemoteNotificationTypeAlert | 
      UIRemoteNotificationTypeBadge | 
      UIRemoteNotificationTypeSound)];

    return YES;
}

然后在 didRegisterForRemoteNotificationsWithDeviceToken 中

- (void)application:(UIApplication *)app didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    NSString *str = [NSString stringWithFormat:@"Device Token=%@",deviceToken];
    NSLog(@"%@",str);

    // get token & udidi
    NSString* newToken = [deviceToken description];
    newToken = [newToken stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"<>"]];
    newToken = [newToken stringByReplacingOccurrencesOfString:@" " withString:@""]; 
    NSString *udid = [UIDevice currentDevice].uniqueIdentifier;

    // send request to server to save token
    NSString *urlString = [NSString stringWithFormat:@"https://my.server.com/service/token?token=%@&udid=%@",newToken, udid];

    NSURL *url = [[NSURL alloc] initWithString:urlString];

    NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url];
    [url release];

    NSURLResponse *response;
    [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:&response error:nil];
}

在我的 WebViewController.m 中

- (void)viewDidLoad
{
    // create and send POST request
    NSURL *url = [NSURL URLWithString:myUrlAddress];
    NSString *udid = [UIDevice currentDevice].uniqueIdentifier;
    NSString *requestString = [NSString stringWithFormat:@"udid=%@", udid];
    NSData *requestData = [NSData dataWithBytes: [requestString UTF8String] length: [requestString length]];
    NSMutableURLRequest *requestObj = [[NSMutableURLRequest alloc] initWithURL:url];
    [requestObj setHTTPMethod:@"POST"];
    [requestObj setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"content-type"];
    [requestObj setHTTPBody: requestData];
    NSURLResponse *response;
    NSError *err;
    [NSURLConnection sendSynchronousRequest: requestObj returningResponse:&response error:&err];

    // set delegate
    webView.delegate = self;

    // set backgroundcolor
    [webView setOpaque:NO];
    [webView setBackgroundColor:RGB(154, 148, 131)];

    // check internet and load
    NetworkStatus currentStatus = [[Reachability reachabilityForInternetConnection] 
                               currentReachabilityStatus];
    if(currentStatus != NotReachable) {
        //Load the request in the UIWebView.
        [webView loadRequest:requestObj];
    }
    else {
        UIAlertView *alert = [[UIAlertView alloc]
                          initWithTitle:@"No Connection" 
                          message:@"Check your Wi-Fi connection and restart the App." 
                          delegate:self
                          cancelButtonTitle:nil 
                          otherButtonTitles:@"Ok", nil];
        [alert show];
        [alert release];
    }
    // prevent scrolling up & down
    [[[webView subviews] lastObject] setScrollEnabled:NO];

   [super viewDidLoad];
}

希望有所帮助...是否 Reachabilit 也是问题所在？

亲切的阅读问候

Answer 1

在 AppDelegate 中注册通知 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 和

尝试实现这些方法，

// one of these will be called after calling -registerForRemoteNotifications
- (void)application:(UIApplication *)application  
didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken 
- (void)application:(UIApplication *)application 
didFailToRegisterForRemoteNotificationsWithError:(NSError *)error 
- (void)application:(UIApplication *)application didReceiveRemoteNotification:
(NSDictionary *)userInfo