如何手动中断 AVPlayer 来电答案

【问题标题】：How to interrupt AVPlayer for incoming call manually如何手动中断 AVPlayer 来电
【发布时间】：2013-10-10 04:30:24
【问题描述】：

我已经使用这个方法How do I get my AVPlayer to play while app is in background? 在后台播放 AVPlayer，这样用户就可以在浏览 safari 等时收听。唯一的问题是现在 AVPlayer 在有来电时继续播放，并在通话期间继续播放.有没有办法捕捉来电和结束通话事件，以便手动停止和启动 AVPlayer？

【问题讨论】：

标签： objective-c background-process avplayer phone-call

【解决方案1】：

通过coreTelephony 框架，我们必须找到或检测来电。从那里您必须启动本地通知以停止您的AVPlayer。导入后这样做

     CTCallCenter * _callCenter = [[CTCallCenter alloc] init];
    _callCenter.callEventHandler = ^(CTCall* call)
    {

        if ([call.callState isEqualToString:CTCallStateDisconnected])
        {
            NSLog(@"Call has been disconnected");
        }
        else if([call.callState isEqualToString:CTCallStateDialing])
        {
            NSLog(@"Call start");
        }
        else if ([call.callState isEqualToString:CTCallStateConnected])
        {

          NSLog(@"Call has just been connected");
        }
        else if([call.callState isEqualToString:CTCallStateIncoming])
        {
            NSLog(@"Call is incoming");
            // You have to initiate/post your local notification through NSNotification center like this 
        [[NSNotificationCenter defaultCenter] postNotificationName:@"stopAVPlayer" object:nil];
        } else
        {
            NSLog(@"None of the conditions");
        }


    };

请参考：https://developer.apple.com/library/ios/navigation/#section=Frameworks&topic=CoreTelephony

【讨论】：

该链接中似乎缺少示例代码。是否应该在 AppDelegate 中创建 CTCallCenter 并通过 NSNotificationCenter 与 ViewController 方法进行通信？还是可以在 View Controller 中与 AVPlayer 实例一起创建？

【解决方案2】：

您现在可以使用 CallKit 来获取电话事件。 (iOS 10.0+) 这对我有好处。

#import <CallKit/CallKit.h>

@interface ViewController ()<CXCallObserverDelegate> {
    CXCallObserver *_center;
}

-(void)viewDidLoad

_center = [[CXCallObserver alloc] init];
dispatch_queue_t queue = dispatch_queue_create("THIS_IS_A_CALL",NULL);
[_center setDelegate:self queue:queue];

委托

- (void)callObserver:(CXCallObserver *)callObserver callChanged:(CXCall *)call {

    NSString *tag = @"callObserver";
    NSString *content = @"";

    if (call.isOutgoing) {
        content = @"call.isOutgoing";
    }
    if (call.hasEnded) {
        content = @"call.hasEnded";
    }

    if (call.hasConnected) {
        content = @"call.hasConnected";
    }

    if (call.isOnHold) {
        content = @"call.isOnHold";
    }
    NSLog(@"%@ - %@", tag, content);
}

【讨论】：