multiple pinch gestures on different images on the same UIView - ios

Question

I am using Xcode 4.4 and target is iOS 5.
As on the title, I would like to create multiple pinch gestures for different images. I use two type of images. One is set as a background and the 2nd type of image is a stamp that is pasted on the image that is set as background. To do this I am using UIGestureRecognizer. Everything is fine until I paste the stamp type of image and try to zoom that image. I can zoom but when I zoom the image, the image has has been set as background zooms as well.
With the code below, I can paste different images (stamp type), tap and drag them individually but not when I try all the content zooms as well. Why isn't working?
Thank you in advance
- (void)viewDidLoad{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
NSLog(#"menuListType=%# ; menuID=%#", self.category.menuListType ,self.menu.menuID);
UIImage *aImage;
NSString *imagepath = [NSString stringWithFormat:#"%#%#",[FileUtility getPDFImageFolderPath], self.menu.imageID];
if (self.menu.imageID == nil || [self.menu.imageID isEqualToString:#""]) {
// self.canvasView.image = [UIImage imageNamed:#"NotExistFile.jpg"];
aImage = [UIImage imageNamed:#"NotExistFile.jpg"];
} else {
// self.canvasView.image = [UIImage imageWithContentsOfFile:imagepath];
aImage = [UIImage imageWithContentsOfFile:imagepath];
// self.canvasView = [[[UIImageView alloc] initWithImage:self.canvasView.image] autorelease];
}
// Choose image base and set as background
if ([self.category.menuListType isEqualToString:#"4"]) {
//set size
int imageW = aImage.size.width;
int imageH = aImage.size.height;
float scale = (imageW > imageH ? 500.0f/imageH : 500.0f/imageW);
CGSize resizedSize = CGSizeMake(imageW * scale, imageH * scale);
UIGraphicsBeginImageContext(resizedSize);
[aImage drawInRect:CGRectMake(0, 0, resizedSize.width, resizedSize.height)];
UIImage *resizedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.canvasView.contentMode = UIViewContentModeTop;
self.canvasView.image = resizedImage;
if (self.menu.imageID == nil || [self.menu.imageID isEqualToString:#""]) {
} else {
self.canvasView = [[[UIImageView alloc] initWithImage:self.canvasView.image] autorelease];
}
} else {
// Paste image and set as background
UIImage *captureImage;
NSString *capturepath = [NSString stringWithFormat:#"%#%#",[FileUtility getPDFImageFolderPath], #"capture.png"];
if ([FileUtility fileExist:capturepath]) {
captureImage = [UIImage imageWithContentsOfFile:capturepath];
} else {
captureImage = [UIImage imageNamed:#"NotExistFile3.png"];
}
self.canvasView.contentMode = UIViewContentModeTop;;
self.canvasView.image = captureImage;
self.canvasView = [[[UIImageView alloc] initWithImage:self.canvasView.image] autorelease];
// Prepare Gestures
iViewsTapidx = 0;
iViewsDblTapidx = 0;
ivMax = sizeof(iViews) / sizeof(iViews[0]);
isTaped = NO;
isDblTaped = NO;
_width = 100;
// Initialization code
// Single tap
UITapGestureRecognizer *tapg =
[[UITapGestureRecognizer alloc] initWithTarget:self
action:#selector(tapAction:)];
[self.itemView addGestureRecognizer:tapg];
// Double tap
UITapGestureRecognizer *doubleTap =
[[UITapGestureRecognizer alloc] initWithTarget:self
action:#selector(doubleTapAction:)];
doubleTap.numberOfTapsRequired = 2;
[self.itemView addGestureRecognizer:doubleTap];
// longPress（長押し）
UILongPressGestureRecognizer *longPress =
[[UILongPressGestureRecognizer alloc] initWithTarget:self
action:#selector(longPressAction:)];
[self.itemView addGestureRecognizer:longPress];
// drag
UIPanGestureRecognizer *pan =
[[UIPanGestureRecognizer alloc] initWithTarget:self
action:#selector(panAction:)];
[self.itemView addGestureRecognizer:pan];
//pinch
UIPinchGestureRecognizer *pinchGestureRognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:#selector(handlePinch:)];
[self.itemView addGestureRecognizer:pinchGestureRognizer];
// Stamp Image
int i = 0;
CGPoint tapPoint = CGPointMake(self.canvasView.center.x, self.canvasView.center.y);
int parcent = aImage.size.width / _width; // Prepare image to paste
// Show stamp
*(iViews+i) = [[UIImageView alloc] initWithImage:aImage];
(*(iViews+i)).frame = CGRectMake(tapPoint.x - aImage.size.width/parcent/2,
tapPoint.y - aImage.size.height/parcent/2,
aImage.size.width/parcent,
aImage.size.height/parcent);
(*(iViews+i)).tag = i+1;
[self.itemView addSubview:*(iViews+i)];
iViewsTapidx = i;
isTaped = YES;
self.itemView.userInteractionEnabled = YES;
}
[self showAnimation];
}
// tap
-(void)tapAction:(UITapGestureRecognizer *) sender{
CGPoint tapPoint = [sender locationInView:self.itemView];
NSLog(#">>>tap x=%.2f, y=%.2f", tapPoint.x, tapPoint.y);
int i =0;
isTaped = NO;
for (i = 0; i < ivMax; i++) {
if (CGRectContainsPoint((*(iViews+i)).frame, tapPoint)) {
isTaped = YES;
iViewsTapidx = i;
NSLog(#"i = %d", i);
break;
}
}
}
// doubleTap
-(void)doubleTapAction:(UITapGestureRecognizer *) sender{
NSLog(#">>>doubleTap");
CGPoint tapPoint = [sender locationInView:self.itemView];
isTaped = NO;
isDblTaped = NO;
int i =0;
for (i = 0; i < ivMax; i++) {
if (CGRectContainsPoint((*(iViews+i)).frame, tapPoint)) {
isDblTaped = YES;
iViewsDblTapidx = i;
break;
}
}
// remove
if (isDblTaped) {
NSLog(#"remove %d", i);
(*(iViews+i)).tag = 0;
[*(iViews+i) removeFromSuperview];
}
}
// longPress
- (void)longPressAction:(UILongPressGestureRecognizer *) sender{
if ([sender state] == UIGestureRecognizerStateBegan) {
NSLog(#">>>longPress 1");
}else if ([sender state] == UIGestureRecognizerStateEnded) {
CGPoint tapPoint = [sender locationInView:self.itemView];
NSLog(#">>>longPress 2 x=%.2f, y=%.2f", tapPoint.x, tapPoint.y);
int i =0;
for (i = 0; i < ivMax; i++) {
NSLog(#"i = %d", i);
if ((*(iViews+i)).tag == 0) {
break;
}
}
if (i < ivMax) {
//Stamp imapge
UIImage *stampImage;
NSString *imagepath = [NSString stringWithFormat:#"%#%#",[FileUtility getPDFImageFolderPath], self.menu.imageID];
if (self.menu.imageID == nil || [self.menu.imageID isEqualToString:#""]) {
stampImage = [UIImage imageNamed:#"NotExistFile.jpg"];
} else {
stampImage = [UIImage imageWithContentsOfFile:imagepath];
}
int parcent = stampImage.size.width / _width; // Set stamp image
//Sow stamp image
*(iViews+i) = [[UIImageView alloc] initWithImage:stampImage];
(*(iViews+i)).frame = CGRectMake(tapPoint.x - stampImage.size.width/parcent/2,
tapPoint.y - stampImage.size.height/parcent/2,
stampImage.size.width/parcent,
stampImage.size.height/parcent);
(*(iViews+i)).tag = i+1;
[self.itemView addSubview:*(iViews+i)];
iViewsTapidx = i;
isTaped = YES;
}
}
}
// drag
- (void)panAction:(UIPanGestureRecognizer *) sender{
NSLog(#">>>pan");
if (isTaped) {
CGPoint p = [sender translationInView:self.itemView];
CGPoint movePoint = CGPointMake((*(iViews+iViewsTapidx)).center.x + p.x,
(*(iViews+iViewsTapidx)).center.y + p.y);
(*(iViews+iViewsTapidx)).center = movePoint;
// NSLog(#">>>pan x=%.2f, y=%.2f --> x=%.2f, y=%.2f", p.x, p.y, movePoint.x, movePoint.y);
NSLog(#">>>pan x=%.2f, y=%.2f", p.x, p.y);
[sender setTranslation:CGPointZero inView:self.itemView];
}
}
-(void) handlePinch:(UIGestureRecognizer *) sender {
UIPinchGestureRecognizer *pinchGesture = (UIPinchGestureRecognizer *) sender;
if (pinchGesture.state == UIGestureRecognizerStateBegan || pinchGesture.state == UIGestureRecognizerStateChanged) {
//UIView *view = pinchGesture.view;
// UIView *view = self.itemView;
self.itemView.transform = CGAffineTransformScale(self.itemView.transform, pinchGesture.scale, pinchGesture.scale);
pinchGesture.scale = 1;
NSLog(#"zoom");
}
}

Answer 1

You will have to add Gesture Recognizer on Uiimageview, Look here for doing so : UIGestureRecognizer on UIImageView

Answer 2

Yet another way is to use UIScrolliew as your container instead of UIView and use the - (UIView*)viewForZoomingInScrollView:(UIScrollView *)aScrollView {
return imageView;
}
here imageView is the image you want to zoom,this will zoom that only image you are pinching its tested and works fine.