iPhone 不支持 ExposureMode AVCaptureExposureModeAutoExpose [英] ExposureMode AVCaptureExposureModeAutoExpose is not supported in iPhone

问题描述

我正在尝试操纵触摸事件并手动调整焦点和曝光以适应用户按下的 CGPoint.我正在使用设备对象并使用 setFocusPointOfInterest 和 setExposurePointOfInterest 来进行操作.看起来焦点工作得很好，但是当我尝试将曝光模式设置为 AVCaptureExposureModeAutoExpose 时，它会崩溃，原因是:此设备不支持设置曝光模式 (%d)."

I'm trying to manipulate the touch event and manually adjust the focus and exposure to fit the CGPoint a user has pressed. I'm taking the device object and uses setFocusPointOfInterest and setExposurePointOfInterest in order to do the manipulation. It seems like the focus is working pretty good but when I try to set the Exposure mode to AVCaptureExposureModeAutoExpose it crashes with the cause : "Setting exposureMode (%d) is not supported by this device."

一开始我以为是因为我用的是 iPhone 3GS，但后来也发生在 iPhone 4 上……

At the beginning I thought it's because I used iPhone 3GS but then it happend on iPhone 4 too ...

有谁知道怎么回事?

谢谢，家伙.

推荐答案

我在苹果开发者论坛上提问了类似的问题，得到了苹果WWDC Camera Capture with AV Foundation 演讲者Brad Ford (Core Media Engineering)的回答.

I was questioning the similar question in Apple Developer forum and got answered by Brad Ford (Core Media Engineering), the speaker of Camera Capture with AV Foundation in Apple's WWDC.

这是他的答案:

正确.AVCaptureExposureModeAutoExpose 虽然在标头中定义，但目前未在任何 iOS 设备上实现.

但是，您可以通过设置所需的代码在自己的代码中实现它兴趣点，然后调用setExposureMode:AVCaptureExposureModeContinuousAutoExposure，然后听(键值观察)的isAdjustingExposure"属性AVCaptureDevice 知道曝光何时完成调整.尽快正如它所做的那样，将ExposureMode 设置为 AVCaptureExposureModeLocked.

You can however implement it in your own code by setting your desired point of interest, then calling setExposureMode:AVCaptureExposureModeContinuousAutoExposure, and then listen (key-value observe) the "isAdjustingExposure" property of AVCaptureDevice to know when the exposure finishes adjusting. As soon as it does, setExposureMode to AVCaptureExposureModeLocked.

希望它能澄清和帮助！

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