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IOS开发,摄像头对焦状态监控

时间:2015-06-15 15:53:37      阅读:445      评论:0      收藏:0      [点我收藏+]

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camera autofocus observer?

 I find the solution for my case to find when autofocus starts / ends. It‘s simply dealing with KVO (Key-Value Observing).

In my UIViewController:

已验证。原地址:http://stackoverflow.com/questions/9100357/iphone-camera-autofocus-observer

// callback
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    if( [keyPath isEqualToString:@"adjustingFocus"] ){
        BOOL adjustingFocus = [ [change objectForKey:NSKeyValueChangeNewKey] isEqualToNumber:[NSNumber numberWithInt:1] ];
        NSLog(@"Is adjusting focus? %@", adjustingFocus ? @"YES" : @"NO" );
        NSLog(@"Change dictionary: %@", change);
    }
}

// register observer
- (void)viewWillAppear:(BOOL)animated{
    AVCaptureDevice *camDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    int flags = NSKeyValueObservingOptionNew; 
    [camDevice addObserver:self forKeyPath:@"adjustingFocus" options:flags context:nil];

    (...)   
}

// unregister observer
- (void)viewWillDisappear:(BOOL)animated{
    AVCaptureDevice *camDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    [camDevice removeObserver:self forKeyPath:@"adjustingFocus"];

    (...)
}

 

IOS开发,摄像头对焦状态监控

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原文地址:http://www.cnblogs.com/nuanshou/p/4577053.html

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