I am using UIPinchGestureRecognizer.can i write two action for pinch in and pinch out..is there any specific Method(delegate)?I have written only one it is called when i pinched in...
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:#selector(handlePinchGesture:)];
[self.view addGestureRecognizer:pinchGesture];
[pinchGesture release];
You could check the gesture's .scale in -handlePinchGesture:. If it is < 1, it is a pinch-in, otherwise is a pinch-out.
// 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;
}
}
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;
}
}
// 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;
}
}
Related
I am trying to zoom in and out an imageView
here is the code
- (void)pinch:(UIPinchGestureRecognizer *)gesture
{
if (handSelected == YES)
{
if (gesture.state == UIGestureRecognizerStateEnded || gesture.state == UIGestureRecognizerStateChanged)
{
NSLog(#"gesture.scale = %f", gesture.scale);
CGFloat currentScale = self.imgHand.frame.size.width / self.imgHand.bounds.size.width;
CGFloat newScale = currentScale * gesture.scale;
if (newScale < 1.0) {
newScale = 1.0;
}
if (newScale > 4.0) {
newScale = 4.0;
}
CGAffineTransform transform = CGAffineTransformMakeScale(newScale, newScale);
self.imgHand.transform = transform;
gesture.scale = 1;
}
}
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self adjustRingPressed:self];
self.view.multipleTouchEnabled = YES;
self.imgHand.multipleTouchEnabled = YES;
UIPinchGestureRecognizer *gst = [[UIPinchGestureRecognizer alloc] initWithTarget:self.imgHand action:#selector(pinch:)];
[gst setDelegate:self];
[self.imgHand addGestureRecognizer:gst];
}
it seems that my pinch Code never runs
try to add:
self.imgHand.userInteractionEnabled = TRUE;
by default UIImageView has userInteractionEnabled = FALSE
make it a function of gesturelike template code below:
- (IBAction)handlePinch:(UIPinchGestureRecognizer *)recognizer
{
recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale);
recognizer.scale = 1;
}
I am having my UIImageView onto which I am having another UIView rectangle. By applying pan gesture to UIView rectangle it gets outside of UIImageView also. I don't want to be drag outside of UIImageView
I have tried below code but it is not working that way
-(void)handleMovementView:(UIPanGestureRecognizer *)recognizer
{
CGPoint movement;
if(recognizer.state == UIGestureRecognizerStateBegan || recognizer.state == UIGestureRecognizerStateChanged || recognizer.state == UIGestureRecognizerStateEnded)
{
CGRect rec = recognizer.view.frame;
CGRect imgvw = self.imgViewCrop.frame;
if((rec.origin.x >= imgvw.origin.x && (rec.origin.x + rec.size.width <= imgvw.origin.x + imgvw.size.width)))
{
CGPoint translation = [recognizer translationInView:recognizer.view.superview];
movement = translation;
recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, recognizer.view.center.y + translation.y);
[recognizer setTranslation:CGPointZero inView:recognizer.view.superview];
[self handleMovementForHandlers:movement];
}
}
}
If i apply Pan slowly it applies this condition but when i go fast it went outside of ImageView
Instead of manually computing whether the points are within the view's bounds, use CGRectContainsPoint(rect, point). This is what works for me, and I like it because it's shorter and more readable:
func handlePan(pan: UIPanGestureRecognizer) {
switch pan.state {
case .Began:
if CGRectContainsPoint(self.pannableView.frame, pan.locationInView(self.pannableView)) {
// Gesture started inside the pannable view. Do your thing.
}
}
Try This
-(void)handleMovementView:(UIPanGestureRecognizer *)recognizer
{
CGPoint movement;
if(recognizer.state == UIGestureRecognizerStateBegan || recognizer.state == UIGestureRecognizerStateChanged || recognizer.state == UIGestureRecognizerStateEnded)
{
CGRect rec = recognizer.view.frame;
CGRect imgvw = self.imgViewCrop.frame;
if((rec.origin.x >= imgvw.origin.x && (rec.origin.x + rec.size.width <= imgvw.origin.x + imgvw.size.width)))
{
CGPoint translation = [recognizer translationInView:recognizer.view.superview];
movement = translation;
recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, recognizer.view.center.y + translation.y);
rec = recognizer.view.frame;
if( rec.origin.x < imgvw.origin.x )
rec.origin.x = imgvw.origin.x;
if( rec.origin.x + rec.size.width > imgvw.origin.x + imgvw.size.width )
rec.origin.x = imgvw.origin.x + imgvw.size.width - rec.size.width;
recognizer.view.frame = rec;
[recognizer setTranslation:CGPointZero inView:recognizer.view.superview];
[self handleMovementForHandlers:movement];
}
}
}
Expanding on #Matt Quiros' answer, and in Swift 3 / 4:
func shouldRespondToGesture(_ gesture: UIGestureRecognizer, in frame: CGRect) -> Bool {
return gesture.state == .began && frame.contains(gesture.location(in: self.view))
}
First get the coordinate (CGRect) of recognizer(Pan Gesture recognizer) then get coordinate (CGRect) of ImageView(Your ImageView).
And then compare this coordinate according to your requirement.
If you are still facing any problem then log the x and y value of image view and recognizer.
I have a problem in scaling the uiimageview which is placed inside the uiscrollview. I have googled and checked all the questions related to my problem in StackOverflow as well. I tried all the answers that are posted in the StackOverflow also. Nothing worked for me.
First I am placing the uiimageview inside uiscrollview in nib file and I am taking the image from Camera roll and filling the image view. Then I am using uirotationgesturerecognizer to rotate the image.
Here is the code that I am trying to do.
- (void)viewDidLoad
{
[super viewDidLoad];
NSLog(#"%#",[[UIDevice currentDevice] model]);
// Do any additional setup after loading the view, typically from a nib.
self.imagePicker = [[[UIImagePickerController alloc] init] autorelease];
self.picChosenImageView.layer.shouldRasterize = YES;
self.picChosenImageView.layer.rasterizationScale = [UIScreen mainScreen].scale;
self.picChosenImageView.layer.contents = (id)[UIImage imageNamed:#"test"].CGImage;
self.picChosenImageView.layer.shadowColor = [UIColor blackColor].CGColor;
self.picChosenImageView.layer.shadowOpacity = 0.8f;
self.picChosenImageView.layer.shadowRadius = 8;
self.picChosenImageView.layer.shadowPath = [UIBezierPath bezierPathWithRect:self.picChosenImageView.bounds].CGPath;
UIRotationGestureRecognizer *rotationRecognizer = [[[UIRotationGestureRecognizer alloc]initWithTarget:self
action:#selector(handleRotate:)] autorelease];
rotationRecognizer.delegate = self;
[self.picChosenImageView addGestureRecognizer:rotationRecognizer];
self.containerView.delegate = self;
self.containerView.contentSize = self.picChosenImageView.layer.frame.size;
self.containerView.maximumZoomScale = 4.0f;
self.containerView.minimumZoomScale = 1.0f;
angle = 0.0f;
useRotation = 0.0;
isRotationStarted=FALSE;
isZoomingStarted = FALSE;
}
-(void)lockZoom
{
maximumZoomScale = self.containerView.maximumZoomScale;
minimumZoomScale = self.containerView.minimumZoomScale;
self.containerView.maximumZoomScale = 1.0;
self.containerView.minimumZoomScale = 1.0;
self.containerView.clipsToBounds = false;
self.containerView.scrollEnabled = false;
}
-(void)unlockZoom
{
self.containerView.maximumZoomScale = maximumZoomScale;
self.containerView.minimumZoomScale = minimumZoomScale;
self.containerView.clipsToBounds = true;
self.containerView.scrollEnabled = true;
}
#pragma mark - ScrollView delegate methods
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return self.picChosenImageView;
}
- (void)scrollViewDidZoom:(UIScrollView *)scrollView
{
CGRect frame = self.picChosenImageView.frame;
frame.origin = CGPointZero;
self.picChosenImageView.frame = frame;
//self.picChosenImageView.transform = prevTransform;
}
-(void) scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view
{
if(!isZoomingStarted)
{
self.picChosenImageView.transform = CGAffineTransformRotate(self.picChosenImageView.transform, angle);
NSLog(#"The zooming started");
isZoomingStarted = TRUE;
CGSize contentSize = self.containerView.bounds.size;
CGRect contentFrame = self.containerView.bounds;
NSLog(#"frame on start: %#", NSStringFromCGRect(contentFrame));
NSLog(#"size on start: %#", NSStringFromCGSize(contentSize));
//prevTransform = self.picChosenImageView.transform;
}
}
-(void) scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale
{
if(isZoomingStarted)
{
self.picChosenImageView.transform = CGAffineTransformRotate(self.picChosenImageView.transform, angle);
isZoomingStarted = FALSE;
CGSize contentSize = self.containerView.contentSize;
CGRect contentFrame = self.containerView.bounds;
NSLog(#"frame on end: %#", NSStringFromCGRect(contentFrame));
NSLog(#"size on end: %#", NSStringFromCGSize(contentSize));
}
}
#pragma mark - GestureRecognizer methods
- (void) handleRotate:(UIRotationGestureRecognizer *)recognizer
{
if(isZoomingStarted == FALSE)
{
if([recognizer state] == UIGestureRecognizerStateBegan)
{
angle = 0.0f;
[self lockZoom];
}
useRotation+= recognizer.rotation;
while( useRotation < -M_PI )
{
useRotation += M_PI*2;
}
while( useRotation > M_PI )
{
useRotation -= M_PI*2;
}
NSLog(#"The rotated value is %f",RADIANS_TO_DEGREES(useRotation));
self.picChosenImageView.transform = CGAffineTransformRotate([self.picChosenImageView transform],
recognizer.rotation);
[recognizer setRotation:0];
if([recognizer state] == UIGestureRecognizerStateEnded)
{
angle = useRotation;
useRotation = 0.0f;
isRotationStarted = FALSE;
self.containerView.hidden = NO;
//prevTransform = self.picChosenImageView.transform;
[self unlockZoom];
}
}
}
My problem is, I am able to successfully do a zoom in and zoom out. I am able to rotate the uiimageview as I wanted to. After rotating the uiimageview to a certain angle, and when I am trying to zoom in, the imageview gets back to the original position (rotate itself back to zero degree) and then the zooming happens. I want to retain the rotation and also zoom. I tried saving the previous transform and assign in back scrollDidzoom and scrollDidBegin delegate methods. None worked. Please help me to spot my mistake which I am overlooking.
try using CGAffineTransformScale instead of just resizing the frame for zooming:
anImage.transform = CGAffineTransformScale(anImage.transform, 2.0, 2.0);
changing the transform for scaling might fix your rotation issue.
hope this helps.
I had the same problem. UIScrollView is taking control over UIImageView and it is using transform without rotation.
So I do not give image reference to scroll and I have added UIPinchGestureRecognizer for scaling.
func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? {
return nil
}
Dragging is still working :)
// viewDidLoad
var pinchGestureRecognizer = UIPinchGestureRecognizer(target: self, action: #selector(pinchRecogniezed))
scrollView.addGestureRecognizer(pinchGestureRecognizer)
func pinchRecogniezed(sender: UIPinchGestureRecognizer) {
if sender.state == .Began || sender.state == .Changed {
let scale = sender.scale
imageView.transform = CGAffineTransformScale(imageView.transform, scale, scale)
sender.scale = 1
}
}
Currently i am using UIRotationGestureRecognizer to rotate my image and my image currently rotating smoothly.
The code which i am using is
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);
So the problem is it is always printing rotation degree as zero.So that i am unable to save the current rotation degree.
Also if i change [gesture setRotation:0]; to some other degree then rotation is not smooth.
So How can i print different rotation degree with smooth rotation.
try with
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);
[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);
}
}
I am implementing the rotation,pich,tap gesture recognizers in my app.I have an image view where i get the user image,then there is button to move to the stamps view,where there are 120 scrollable stamp images of 1000*100.The problem is that when i choose one stampimage,the gesture works fine.But when i again move to the stamp view and choose stamp,the first one stamp become static and does not recognize any gesture,only the current stamp recognize the gesture.
What i am performing is to select multiple stamps and then i can rotate them,strech them,pinch them.
Here is the code which i am implementing.Just help me how to acheive this...
-(void)viewWillAppear:(BOOL)animated
{
if (stampImageView) {
[stampImageView release];
}
stampImageView=[[UIImageView alloc]initWithFrame:CGRectMake(self.view.center.x-100, 200, 80, 80)];
stampImageView.tag=(int)mAppDel.frameImageString;
NSLog(#"tag is %#",stampImageView.tag);
stampImageView.userInteractionEnabled=YES;
if(mAppDel.frameImageString)
stampImageView.image=[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:mAppDel.frameImageString ofType:#"png"]];
[self.view addSubview:stampImageView];
stampImageView.userInteractionEnabled=YES;
[self.view bringSubviewToFront:stampImageView];
UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:#selector(rotatePiece:)];
[stampImageView addGestureRecognizer:rotationGesture];
[rotationGesture release];
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:#selector(scalePiece:)];
[pinchGesture setDelegate:self];
[stampImageView addGestureRecognizer:pinchGesture];
[pinchGesture release];
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(panPiece:)];
[panGesture setMaximumNumberOfTouches:1];
[panGesture setDelegate:self];
[stampImageView addGestureRecognizer:panGesture];
[panGesture release];
}
Did u try using the delegate method
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;
I implement this logic for monotouch but you can use it in you app
void AddGestureRecognizersToImage (UIImageView imgView)
{
imgView.UserInteractionEnabled = true;
// rotate the images
var rotationGesture = new UIRotationGestureRecognizer (this, new Selector ("RotateImage"));
imgView.AddGestureRecognizer (rotationGesture);
// Zoom the image
var pinchGesture = new UIPinchGestureRecognizer (this, new Selector ("ScaleImage"));
//pinchGesture.Enabled = true;
pinchGesture.Delegate = new GestureDelegate (this);
imgView.AddGestureRecognizer (pinchGesture);
var panGesture = new UIPanGestureRecognizer(this, new Selector ("PanImage"));
//panGesture.Enabled = true;
panGesture.MaximumNumberOfTouches = 2;
panGesture.Delegate = new GestureDelegate (this);
imgView.AddGestureRecognizer (panGesture);
var longPressGesture = new UILongPressGestureRecognizer (this, new Selector ("ShowResetMenu"));
imgView.AddGestureRecognizer (longPressGesture);
}
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);
}
}