iOS CoreTelephony implements monitoring call status

If you need to monitor the status of the phone in the program, you can introduce the CoreTelephony framework. This framework includes phone-related APIs, which can realize functions such as monitoring incoming calls and viewing operator information. The following is the specific code to implement monitoring calls. Be sure to write the center as a separate attribute and it is a strong reference. Otherwise, if a center is created in the viewDidLoad method, the center will be destroyed after the viewDidLoad method is called, and the incoming call cannot be detected.

The initial state of a call is incoming (CTCallStateIncoming) and outgoing (CTCallStateDialing). When it is turned on, the state changes to ON (CTCallStateConnected), and when the call is terminated, the state changes to ON (CTCallStateDisconnected)

CTCallCenter *center = [[CTCallCenter alloc]init];
center_ = center;
 = ^(CTCall *call){
NSLog(@"call:%@",);
if ([ isEqualToString:@"CTCallStateDialing"]) {
//Calling status}
if ([ isEqualToString:@"CTCallStateDisconnected"]) {
//Disconnected state}
};

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