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現在、UIRotationGestureRecognizerを使用して画像を回転させており、画像は現在スムーズに回転しています。

私が使用しているコードは

   CGFloat imageRotationDegree;

    if ([gesture state] == UIGestureRecognizerStateBegan || [gesture state] == UIGestureRecognizerStateChanged) 
    {
        [gesture view].transform = CGAffineTransformRotate([[gesture view] transform], [gesture rotation]);
        [gesture setRotation:0];
         imageRotationDegree=[gesture rotation];
    }

    NSLog(@"Rotation in Degrees: %f", imageRotationDegree);

問題は、常に回転角度をゼロとして印刷していることです。そのため、現在の回転角度を保存できません。

また、 [gesture setRotation:0];他の程度に変更すると、回転がスムーズになりません。

では、スムーズな回転でさまざまな回転角度を印刷するにはどうすればよいですか。

4

2 に答える 2

0

で試してみてください

CGFloat imageRotationDegree;

if ([gesture state] == UIGestureRecognizerStateBegan || [gesture state] == UIGestureRecognizerStateChanged) 
{
    imageRotationDegree = [gesture rotation];
    [gesture view].transform = CGAffineTransformRotate([[gesture view] transform], imageRotationDegree);
    [gesture setRotation:0];
}

NSLog(@"Rotation in Degrees: %f", imageRotationDegree);
于 2011-11-07T16:11:27.113 に答える
0 
[Export("RotateImage")]
void RotateImage (UIRotationGestureRecognizer gestureRecognizer)
{
    AdjustAnchorPointForGestureRecognizer (gestureRecognizer);

    if (gestureRecognizer.State == UIGestureRecognizerState.Began || gestureRecognizer.State == UIGestureRecognizerState.Changed)
    {
        gestureRecognizer.View.Transform *= CGAffineTransform.MakeRotation (gestureRecognizer.Rotation);

        // Reset the gesture recognizer's rotation - the next callback will get a delta from the current rotation.
        gestureRecognizer.Rotation = 0;
    }
}

void AdjustAnchorPointForGestureRecognizer (UIGestureRecognizer gestureRecognizer)
{
    if (gestureRecognizer.State == UIGestureRecognizerState.Began)
    {
        var image = gestureRecognizer.View;
        var locationInView = gestureRecognizer.LocationInView (image);
        var locationInSuperview = gestureRecognizer.LocationInView (image.Superview);

        image.Layer.AnchorPoint = new PointF (locationInView.X / image.Bounds.Size.Width, locationInView.Y / image.Bounds.Size.Height);
        image.Center = locationInSuperview;
    }
}

[Export("RotateImage")]
void RotateImage (UIRotationGestureRecognizer gestureRecognizer)
{
    AdjustAnchorPointForGestureRecognizer (gestureRecognizer);

    if (gestureRecognizer.State == UIGestureRecognizerState.Began || gestureRecognizer.State == UIGestureRecognizerState.Changed)
    {
        gestureRecognizer.View.Transform *= CGAffineTransform.MakeRotation (gestureRecognizer.Rotation);

        // Reset the gesture recognizer's rotation - the next callback will get a delta from the current rotation.
        gestureRecognizer.Rotation = 0;
    }
}

// Zoom the image by the current scale

[Export("ScaleImage")]
void ScaleImage (UIPinchGestureRecognizer gestureRecognizer)
{
    AdjustAnchorPointForGestureRecognizer (gestureRecognizer);

    if (gestureRecognizer.State == UIGestureRecognizerState.Began || gestureRecognizer.State == UIGestureRecognizerState.Changed)
    {
        gestureRecognizer.View.Transform *= CGAffineTransform.MakeScale (gestureRecognizer.Scale, gestureRecognizer.Scale);

        // Reset the gesture recognizer's scale - the next callback will get a delta from the current scale.
        gestureRecognizer.Scale = 1;
    }
}

// Shift the image's center by the pan amount

[Export("PanImage")]
void PanImage (UIPanGestureRecognizer gestureRecognizer)
{           
    gestureRecognizer.Enabled = true;
    AdjustAnchorPointForGestureRecognizer (gestureRecognizer);
    var image = gestureRecognizer.View;

    if (gestureRecognizer.State == UIGestureRecognizerState.Began || gestureRecognizer.State == UIGestureRecognizerState.Changed)
    {           
        var translation = gestureRecognizer.TranslationInView (this.window);

        gestureRecognizer.View.Center = new PointF (gestureRecognizer.View.Center.X + translation.X, gestureRecognizer.View.Center.Y + translation.Y);

        //image.Center = new PointF (image.Center.X + translation.X, image.Center.Y + translation.Y);

        // Reset the gesture recognizer's translation to {0, 0} - the next callback will get a delta from the current position.
        gestureRecognizer.SetTranslation (PointF.Empty, image);
    }
}
于 2012-04-10T10:46:59.930 に答える