ios 开发在应用中监听(判断)来电状态-接听-拒接-CoreTelephony

#import <CoreTelephony/CTCall.h>

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#import <CoreTelephony/CTCallCenter.h>
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CTCallCenter *callCenter = [[CTCallCenter alloc] init];
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    callCenter.callEventHandler=^(CTCall* call){
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        if (call.callState == CTCallStateDialing){
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            NSLog(@"Call Dialing");
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        }
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        if (call.callState == CTCallStateConnected){
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            NSLog(@"Call Connected");
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            [self performSelectorOnMainThread:@selector(closeTalk) withObject:nil waitUntilDone:YES];
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        }
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        if (call.callState == CTCallStateDisconnected){
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            [self performSelectorOnMainThread:@selector(closeTalk) withObject:nil waitUntilDone:YES];
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            NSLog(@"Call Disconnected");
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        }
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    };
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将如上代码添加到

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions