#import <CoreTelephony/CTCallCenter.h>#import <CoreTelephony/CTCall.h>

@property (nonatomic, strong) CTCallCenter *callCenter;

 　　self.callCenter = [[CTCallCenter alloc] init];    self.callCenter.callEventHandler=^(CTCall* call)    {        if (call.callState == CTCallStateDisconnected)        {            NSLog(@"挂断电话Call has been disconnected");             }        else if (call.callState == CTCallStateConnected)        {             NSLog(@"电话通了Call has just been connected");          }        else if(call.callState == CTCallStateIncoming)        {            NSLog(@"来电话了Call is incoming");          }        else if (call.callState ==CTCallStateDialing)        {            NSLog(@"正在播电话call is dialing");          }        else        {            NSLog(@"Nothing is done");          }    };