目前我正在使用UIRotationGestureRecognizer来旋转我的图像,而且我的图像目前正在顺畅地旋转。
我正在使用的代码是
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);
所以问题是它总是将旋转度打印为零。所以我无法保存当前的旋转度。
此外,如果我将[gesture setRotation:0];
更改为其他程度,则轮换不顺畅。
那么如何以平滑的旋转方式打印不同的旋转度。
答案 0 :(得分:0)
尝试
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);
答案 1 :(得分: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);
}
}