导入<CoreTelephoney/CTCallCenter.h><CoreTelephony/CTCall.h>
具体代码：
self.callCenter = [[CTCallCenter alloc] init];
self.callCenter.callEventHandler = ^(CTCall* call) {
if ([call.callState isEqualToString:CTCallStateDisconnected])
{
NSLog(@"Call has been disconnected");
}
else if ([call.callState isEqualToString:CTCallStateConnected])
{
NSLog(@"Call has just been connected");
}
else if([call.callState isEqualToString:CTCallStateIncoming])
{
NSLog(@"Call is incoming");
}
else if ([call.callState isEqualToString:CTCallStateDialing])
{
NSLog(@"call is dialing");
}
else
{
NSLog(@"Nothing is done");
}
};
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