监听电话来时候的一些状态

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

/// 监听拨打电话状态
_callCenter = [[CTCallCenter alloc] init];
_callCenter.callEventHandler=^(CTCall* call)
{
if (call.callState == CTCallStateDisconnected)
{
NSLog(@"挂断电话");

}
else if (call.callState == CTCallStateConnected)
{
NSLog(@"电话刚连接通");
}
else if(call.callState == CTCallStateIncoming)
{
NSLog(@"有电话打进来");

}
else if (call.callState ==CTCallStateDialing)
{
NSLog(@"拨打电话");
}
else
{
NSLog(@"Nothing is done");
}
};