从应用程序（带有网络视图）拨打电话后，Iphone 应用程序在一段时间内没有响应

Question

我使用此代码从我的应用程序拨打电话（我使用 webview，因为通话结束后，我不想显示拨号器应用程序）：

UIWebView *callWebview = [[UIWebView alloc] init];
[self.view addSubview:callWebview];
NSURL *telURL = [NSURL URLWithString:tel];
[callWebview loadRequest:[NSURLRequest requestWithURL:telURL]];

我通过订阅通知检测到通话结束：

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(ctCallStateDidChange1:) name:@"CTCallStateDidChange" object:nil];

   - (void)ctCallStateDidChange1:(NSNotification *)notification
  {
     NSString *call = [[notification userInfo] objectForKey:@"callState"];
     if ([call isEqualToString:CTCallStateDisconnected])
    { 
       NSLog(@"Call has been disconnected");
       UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Obvestilo" message:@"Some text?"
                                                           delegate:self cancelButtonTitle:@"Yes" otherButtonTitles: @"No", nil];
            [alert show];
        }       
    }       
}

我需要在通话结束后显示 alertview 并将控制权返回给我的应用程序，但有时需要一些时间才能检测到通话结束并发出通知，并且我的应用程序在此期间保持无响应。

你有什么想法吗？

Answer 1

please expline more your what you need exactly !!!!! after reading you code, i concluded that you want save a event handler that you notify if state of call !! No ?

First You need to save event Handler in you Apps before you make you call like that ok : 

1. `CTCallCenter *callCenter = [[CTCallCenter alloc] init];
callCenter.callEventHandler = ^(CTCall* call)
{
if (call.callState == CTCallStateDisconnected)`enter code here`
{
NSLog(@"Call has been disconnected");
// you can do any things here, your treatment
}
else if (call.callState == CTCallStateConnected)
{
NSLog(@"Call has just been connected");
// you can do any things here, your treatment
}
else if(call.callState == CTCallStateIncoming)
{
NSLog(@"Call is incoming");
// you can do any things here, your treatment
}
else
{http://stackoverflow.com/posts/9911993/edit
NSLog(@"None of the conditions");
// you can do any things here, your treatment
}
}; 
`
2. you need indicated to the system that you want let you apps alive in background and make call by the code : 
`UIApplication *appDelegate = [UIApplication sharedApplication];

    if ([[UIDevice currentDevice] respondsToSelector:@selector(isMultitaskingSupported)])
    {
        DLog(@"supporte Multitasking");
    }else
    {
        return;
    }`

    `backgroundTask = [appDelegate beginBackgroundTaskWithExpirationHandler:^{
        // DLog(@"beginTask");

    }];`

    `NSString *tel = [@"tel://" stringByAppendingFormat:@"12345"];
    [appDelegate openURL:[NSURL URLWithString:tel]];`


3. For returne in you application registry event UILocalNotification and implement this method in you delegate
` #pragma mark local notification
-(void) application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification
`
i hope that help you

Answer 2

检测到带有通知的通话结束是正确的。我要做的是在调用完成后添加这一行（因此在主线程上执行的命令）：

 dispatch_async(dispatch_get_main_queue(), ^{ 
                [self showAlert];
            });