ios 关于通话状态监听

    _callCenter = [[CTCallCenter alloc] init];//定义为成员变量

    _callCenter.callEventHandler=^(CTCall* call){
        if([call.callState isEqualToString:CTCallStateDisconnected])
        {
            NSLog(@"呼叫已断开连接");
       
        }else if([call.callState isEqualToString:CTCallStateIncoming]){
            NSLog(@"呼叫进来");
            
        }else if([call.callState isEqualToString:CTCallStateConnected]) {
            NSLog(@"电话已连接");
        }else if([call.callState isEqualToString:CTCallStateDialing]) {
            NSLog(@"呼叫状态拨号");
        }else{
            NSLog(@"没有任何事情完成");
        }
    };

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