GestureRecognizerの処理(カメラ拡大時)

gistfile1.m

//--------------------------------------------------------------------------------
#pragma mark -
#pragma mark  GestureRecognizer
//--------------------------------------------------------------------------------
// scale image depending on users pinch gesture
- (void)handlePinchGesture:(UIPinchGestureRecognizer *)recognizer
{
    NSLog(@"-------------------------------");
    NSLog(@"%s", __FUNCTION__);
    NSLog(@"scale = %f", recognizer.scale);

    BOOL allTouchesAreOnThePreviewLayer = YES;
    NSUInteger numTouches = [recognizer numberOfTouches];

    NSLog(@"touches = %i", numTouches);

    NSUInteger i;
    for ( i = 0; i < numTouches; ++i ) {
        CGPoint location = [recognizer locationOfTouch:i inView:self];
        CGPoint convertedLocation = [previewLayer convertPoint:location fromLayer:previewLayer.superlayer];
        if ( ! [previewLayer containsPoint:convertedLocation] ) {

            NSLog(@"containsPoint!!");
            allTouchesAreOnThePreviewLayer = NO;
            break;
        }
    }

    if ( allTouchesAreOnThePreviewLayer ) {

        NSLog(@"scale in beginGestureScale = %f", beginGestureScale);

        effectiveScale = beginGestureScale * recognizer.scale;

        NSLog(@"scale in effectiveScale = %f", effectiveScale);

        if (effectiveScale < 1.0) {
            effectiveScale = 1.0;
        }

        CGFloat maxScaleAndCropFactor = [[stillImageOutput connectionWithMediaType:AVMediaTypeVideo] videoMaxScaleAndCropFactor];
        NSLog(@"scale in maxScaleAndCropFactor = %f", maxScaleAndCropFactor);

        if (effectiveScale > maxScaleAndCropFactor) {
            effectiveScale = maxScaleAndCropFactor;
        }
        [CATransaction begin];
        [CATransaction setAnimationDuration:.025];
        [previewLayer setAffineTransform:CGAffineTransformMakeScale(effectiveScale, effectiveScale)];
        [CATransaction commit];


    }


    NSLog(@"effectiveScale = %f", effectiveScale);
    NSLog(@"-------------------------------");
}
// ジェスチャー処理がはじまった時の処理
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
    NSLog(@"%s", __FUNCTION__);
    if ( [gestureRecognizer isKindOfClass:[UIPinchGestureRecognizer class]] ) {
        beginGestureScale = effectiveScale;
    }
    return YES;
}