iOS:AVFoundation:焦点

Question

有没有办法在自动对焦完成后始终获得对焦点？

在Apple的示例代码中，他们使用:

    - (void)subjectAreaDidChange:(NSNotification *)notification

{

     CGPoint devicePoint = CGPointMake(.5, .5);

     [self focusWithMode:AVCaptureFocusModeContinuousAutoFocus exposeWithMode:AVCaptureExposureModeContinuousAutoExposure atDevicePoint:devicePoint monitorSubjectAreaChange:NO];

}

上面的代码仅适用于“点击聚焦”。它还强制相机聚焦在屏幕中央。我想在自动对焦完成后随时获得对焦点。

Answer 1

看起来你可以直接阅读focusPointOfInterest属性来获取当前焦点:

- (void)subjectAreaDidChange:(NSNotification *)notification
{
     CGPoint devicePoint = device.focusPointOfInterest;
}