导入CoreTelephony.framework
@property (nonatomic, strong) CTCallCenter *callCenter;
这个一定要声明为属性，如果在某个函数中做声明的话，ARC就会自动在函数执行结束的时候将其释放掉。
#import <CoreTelephony/CTCallCenter.h>
#import <CoreTelephony/CTCall.h>
@property (nonatomic, strong) CTCallCenter *callCenter;
CTCallCenter *callCenter = [[CTCallCenter alloc] init];
callCenter.callEventHandler = ^(CTCall* call) {
if ([call.callState isEqualToString:CTCallStateDisconnected])
{
NSLog(@"挂断电话Call has been disconnected");
}
else if ([call.callState isEqualToString:CTCallStateConnected])
{
NSLog(@"电话通了Call has just been connected");
}
else if([call.callState isEqualToString:CTCallStateIncoming])
{
NSLog(@"来电话了Call is incoming");
}
else if ([call.callState isEqualToString:CTCallStateDialing])
{
NSLog(@"正在拨出电话call is dialing");
}
else
{
NSLog(@"什么没做Nothing is done");
}
};
call.callState 这个属性记录了电话操作的状态，具体都有哪些值可以通过头文件得知。
