當Flash ON或OFF自動閃光模式下，由於光線較暗

如何獲得通知正在使用的UIImagePickerController呈現相機，最初使閃光模式爲自動。當Flash ON或OFF自動閃光模式下，由於光線較暗

videoCapturer.sourceType = UIImagePickerControllerSourceType.Camera 
videoCapturer.mediaTypes = [kUTTypeMovie as String] 
videoCapturer.cameraFlashMode = UIImagePickerControllerCameraFlashMode.Auto 
[self .presentViewController(videoCapturer, animated: true, completion: nil)]

我希望在閃光燈根據照明設置爲ON或OFF得到通知。

來源

2016-07-27 Rajjjjjj

只需使用志願。

let capture = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo) 
capture.addObserver(self, forKeyPath: "torchActive", options: NSKeyValueObservingOptions.New.union(.Initial), context: nil)

而實現此方法：

public override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) { 
    if keyPath == "torchActive" { 
     // do something when torchActive changed 
    } else { 
     super.observeValueForKeyPath(keyPath, ofObject: object, change: change, context: context) 
    } 
}

這裏是蘋果公司的torchActive的描述：

@property torchActive 
@abstract 
    Indicates whether the receiver's torch is currently active. 

@discussion 
    The value of this property is a BOOL indicating whether the receiver's torch is 
    currently active. If the current torchMode is AVCaptureTorchModeAuto and isTorchActive 
    is YES, the torch will illuminate once a recording starts (see AVCaptureOutput.h 
    -startRecordingToOutputFileURL:recordingDelegate:). This property is key-value observable.

來源

2016-07-27 07:03:06 zylenv

時提出UIImagePickerController類這隻叫，不叫當閃光燈模式改變自動由於照明。 – Rajjjjjj

我有更新我的答案，希望這會有所幫助。 – zylenv

當Flash ON或OFF自動閃光模式下，由於光線較暗

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