在iOS中使用CTCallCenter检测呼叫状态

以下代码可以很好地在iPhone 4s（运行iOS 5.1.1）中获取我的应用程序中的呼叫状态，但在iPhone 5s（运行iOS 7.1.2）中无法获取wokring。你能帮助任何人吗

在MyViewController.h中

@property (nonatomic, strong) CTCallCenter* callCenter;

在MyViewController.m中

- (void)viewDidLoad
{
    [self registerForCalls];
}

- (void) registerForCalls {

    self.callCenter = [[CTCallCenter alloc] init];

    [callCenter setCallEventHandler: ^(CTCall* call) {
        if (call.callState == CTCallStateDisconnected)
        {
            NSLog(@"Call has been disconnected");
        }
        else if (call.callState == CTCallStateConnected)
        {
            NSLog(@"Call has just been connected");
        }
        else if (call.callState == CTCallStateIncoming)
        {
            NSLog(@"Call is incoming");
        }
        else if (call.callState == CTCallStateDialing)
        {
            NSLog(@"Call is Dialing");
        }
        else
        {
            NSLog(@"None of the conditions");
        }
    }];
}

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也许你可以试试这个解决方案