Question

我想像使用AVCam的原生相机应用程序一样创建焦点功能，但无法创建相同的功能。我使用上面的代码：

if ([[[captureManager videoInput] device] isFocusPointOfInterestSupported]) {
        CGPoint tapPoint = [tgr locationInView:[self videoPreviewView]];
        CGPoint convertedFocusPoint = [self convertToPointOfInterestFromViewCoordinates:tapPoint];
        [self addLayoutsOfAutoFocus:tapPoint];
        [USERDEFAULTS setValue:[NSString stringWithFormat:@"%f",convertedFocusPoint.x] forKey:x_value];
        [USERDEFAULTS setValue:[NSString stringWithFormat:@"%f",convertedFocusPoint.y] forKey:y_value];
        [USERDEFAULTS synchronize];
        [captureManager continuousFocusAtPoint:convertedFocusPoint];
        [captureManager continuousExpousureAtPoint:convertedFocusPoint];

    }

我正在尝试保存焦点，但下次重新加载相机时焦点会丢失。

请帮忙。

Answer 1

我找到了解决方法。我发布在这里以供将来参考。我使用的技巧是再次使用用户点击的新点设置会话。这是代码;

- (void)tapToContinouslyAutoFocus:(UIGestureRecognizer *)tgr
{
if ([[[captureManager videoInput] device] isFocusPointOfInterestSupported]) {
        CGPoint tapPoint = [tgr locationInView:[self videoPreviewView]];
        CGPoint convertedFocus = [self convertToPointOfInterestFromViewCoordinates:tapPoint];
        CGPoint convertedFocusPoint=CGPointMake(convertedFocus.y, convertedFocus.x);
        [self addLayoutsOfAutoFocus:tapPoint];
        [USERDEFAULTS setValue:[NSString stringWithFormat:@"%f",convertedFocusPoint.x] forKey:x_value];
        [USERDEFAULTS setValue:[NSString stringWithFormat:@"%f",convertedFocusPoint.y] forKey:y_value];
        [USERDEFAULTS synchronize];

        [[self captureManager] setSession:nil];
        [[self captureManager] setupSession];
        [captureManager autoFocusAtPoint:convertedFocusPoint];
        [captureManager autoExposureAtPoint:convertedFocusPoint];

    }


}

当用户双击屏幕以进行对焦时，将调用上述方法。

像使用原生相机应用程序一样使用AVCam

1 个答案: