问题
I am very new to IOS Swift. But I am building a sample camera app that takes picture and video and then saved to photo gallery. But I want user to choose Auto/On/Off Flash option on the Camera View and when the user takes the picture then flash turns on or turns off depending on option what he/she chooses. I am using UIImagePickerController to customize camera features. I couldn't get much suggestions so far on how can I able to On/Off feature on the camera view and the camera flash works simultaneously while pressing button.
Is there any Camera Flash capability presented in UIImagePickerController already? If so, then how can I add or use with my code I have so far, so flash and taking picture works together.
Any help with the swift example regarding how can I able to add the flash capability in my controller and how to work at the same time while taking picture? Can someone please point me towards the right direction. Any help will be greatly appreciated.
回答1:
UIImagePicker has a property called cameraFlashMode you can set
imagePicker.cameraFlashMode = UIImagePickerControllerCameraFlashMode.On
回答2:
In iOS 4.0 and later, you can provide custom controls to let the user adjust flash mode (on devices that have a flash LED), pick which camera to use (on devices that have a front and rear camera), and switch between still image and movie capture.
You can also manage these settings programmatically. You can also manipulate the flash directly to provide effects such as a strobe light. Present a picker interface set to use video capture mode. Then, turn the flash LED on or off by setting the cameraFlashMode property to UIImagePickerControllerCameraFlashModeOn or UIImagePickerControllerCameraFlashModeOff.
来源：https://stackoverflow.com/questions/30067202/camera-flash-turn-auto-on-off-with-uiimagepickercontroller-in-ios-swift