UIScrollview touchesbegan,touchesmoved,touchesended actions - iphone

I did this touch actions in UIView, ie,
in a uiview there are two or three subviews v1,v2,v3. I used the code below to place the image i1,i2,i3 in corresponding views and if I moves the touch the images move to that point in the view.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
if ([touch view] == v1)
{
CGPoint location = [touch locationInView:v1];
i1.center = location;
}
else if([touch view] == v2)
{
CGPoint location = [touch locationInView:v2];
i2.center = location;
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
if ([touch view] == v1)
{
CGPoint location = [touch locationInView:v1];
i1.center = location;
}
else if([touch view] == v2)
{
CGPoint location = [touch locationInView:v1];
i2.center = location;
}
}
Now I have to do this for a sequence of 28 images so I went for Uiscrollview but I cant get that please explain me clearly with code. thanks a lot in advance for your help.


You need to subclass UIScrollView to get touch events of UIScrollView.

Related

Multi object drag

While dragin multi objects using the following code the the object is shaking when i touch the object,
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [[event allTouches] anyObject];
if ([touch view] == img1)
{
CGPoint location = [touch locationInView:touch.view];
img1.center = location;
return;
}
if (touch.view == img2)
{
CGPoint location = [touch locationInView:touch.view];
img2.center = location;
return;
}
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
[self touchesBegan:touches withEvent:event];
}
What is problem in my code, is there any other method to drag and if the view contain one more object?please help me to solve this issue

I think if you are talking about more object to drag all at once then you should remove the return from you touch begain method

Uiimageview not moving

I have 4 image views on a view.I want to make the 4 images movable.I used touches moved method.It seems to work for 3 of my image views .However the fourth one is not moving.The touch is detected in all cases which i have verified by NSlog.Please help.
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:self.view];
if ([touch view] == textstyleImage) {
textstyleImage.center = location;
}
else if ([touch view] == clipartImage){
clipartImage.center = location;
}
else if([touch view] == customMessage){
customMessage.center = location;
}
else if([touch view] == galleryImage){
galleryImage.center = location;
}
}

Enable user interaction for that imageview like this
[fourthImageView setUserInteractionEnabled:YES];
and test it again.

Drag images and resize them on touch(iPhone)

I am creating an app in which when user click on any object and when user tap on UIView, then that images should drop on the view, and on dragging that image in any direction it should be re-sized.
Anyone having any idea to do this, please let me know.
or Can I get any sample code for this?
Thanks

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
if ([touch view] == photo) {
photo.center = touchLocation;
}
else if ([touch view] == photo1) {
photo1.center = touchLocation;
}
}
or you can see in that link http://www.roseindia.net/tutorial/iphone/examples/iphone-DoubleImageMoveasd.html

Have Multiple Moving UIImage Views With Different Touches

I am working on trying to get multiple UIImageViews to move when they are dragged. I was originally putting all the movement under TouchesBegan. However, when I drag a single object, they all disappear and only the one I am dragging moves.
How can I have each image dragged own its own terms(I drag the first image, only the first image moves etc.)?

I'm not sure if this is what you're looking for but I worked on this a while ago, so hopefully it's useful.
Just make sure you set up 7 UIImageViews in the XIB File, link them and you'll be good to go.
#synthesize img1, img2, img3, img4, img5, img6, magnet;
-(void) checkInsertion {
if (CGRectContainsRect(img2.frame, img1.frame)) {img1.center = img2.center;}
if (CGRectContainsRect(img4.frame, img3.frame)) {img3.center = img4.center;}
if (CGRectContainsRect(img6.frame, img5.frame)) {img5.center = img6.center;}
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.2];
if (CGRectIntersectsRect(magnet.frame, img1.frame)) {img1.center = magnet.center;}
if (CGRectIntersectsRect(magnet.frame, img2.frame)) {img2.center = magnet.center;}
if (CGRectIntersectsRect(magnet.frame, img3.frame)) {img3.center = magnet.center;}
if (CGRectIntersectsRect(magnet.frame, img4.frame)) {img4.center = magnet.center;}
if (CGRectIntersectsRect(magnet.frame, img5.frame)) {img5.center = magnet.center;}
if (CGRectIntersectsRect(magnet.frame, img6.frame)) {img6.center = magnet.center;}
[UIView commitAnimations];
}
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch * touch = [[event allTouches] anyObject];
CGPoint touchLoc = [touch locationInView:touch.view];
if (CGRectContainsPoint(img1.frame, touchLoc)) {img1.center = touchLoc;}
if (CGRectContainsPoint(img3.frame, touchLoc)) {img3.center = touchLoc;}
if (CGRectContainsPoint(img5.frame, touchLoc)) {img5.center = touchLoc;}
if (CGRectContainsPoint(magnet.frame, touchLoc)) {magnet.center = touchLoc;}
[self checkInsertion];
}
-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
[self touchesBegan:touches withEvent:event];
}

You should look at UIPanGestureRecognizer. In the view controller that's responsible for these multiple image views, add a pan gesture recognizer to each of the image views. The view controller should be responsible for responding to the pan gesture callbacks and move the frame of the image view accordingly.
Of note, you should also grab the offset of the touch within the image view from the center and store this. Then, when the view is panned, you need to factor in the offset into your calculations. This is so the view doesn't just jump to the user's finger if they start dragging somewhere distant from the center point.
See the WWDC session videos from 2010 and 2011 about UIScrollView. Especially from 2011. They go into examples of how to do some of this.

I have gotten it to work!
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event touchesForView:self.view] anyObject];
CGPoint location = [touch locationInView:touch.view];
if(CGRectContainsPoint(plusone.frame, location))
{
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:touch.view];
plusone.center = location;
}
if(CGRectContainsPoint(plustwo.frame, location))
{
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:touch.view];
plustwo.center = location;
}
if(CGRectContainsPoint(plusthree.frame, location))
{
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:touch.view];
plusthree.center = location;
}
if(CGRectContainsPoint(minusone.frame, location))
{
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:touch.view];
minusone.center = location;
}
if(CGRectContainsPoint(minustwo.frame, location))
{
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:touch.view];
minustwo.center = location;
}
if(CGRectContainsPoint(minusthree.frame, location))
{
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:touch.view];
minusthree.center = location;
}
But, When An Image Collides With Another, It Disappears!
Does anyone have a fix to this problem?

Drag View from the point you touch it iPhone

I know how to drag a view or object:
- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [[event allTouches] anyObject];
if( [touch view] == ViewMain)
{
CGPoint location = [touch locationInView:self.view];
ViewMain.center = location;
}
}
but I would like to start dragging that view or image from the point where I touched it. for example if I drag (I highlighted the view and placed blue on the cursor):
the moment I start dragging if I drag the mouse 20 px to the right for example then I would like the view to also drag 20 px instead of:
maybe I have to change the center of the view to the point where I fist touch it. How could I do that?
In other words I would like to do something like when you drag the apps on the iPad:

float startX = 0;
float startY = 0;
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [[event allTouches] anyObject];
if( [touch view] == ViewMain)
{
CGPoint location = [touch locationInView:self.view];
startX = location.x - ViewMain.center.x;
startY = ViewMain.center.y;
}
}
- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [[event allTouches] anyObject];
if( [touch view] == ViewMain)
{
CGPoint location = [touch locationInView:self.view];
location.x =location.x - startX;
location.y = startY;
ViewMain.center = location;
}
}