I have a view which, when I click on it, will move left and right. I only get the point center of the view. How can I get the uiview on the anchorpoint because where ever i click on the view it will move.
Here is my code:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(#"touchesMoved called");
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchpoint=[touch locationInView:self.view];
if ([touch view]==secondView)
{
secondView.center=touchpoint;
[self animateFirstPoint:[touch view]];
}
}
If I get you right you're searching for the anchorpoint of the UIView.
First import QuartzCore:
#import <QuartzCore/QuartzCore.h>
Now you can use the anchorpoint of your view:
secondView.layer.anchorPoint = touchpoint;
Remember you have to specify anchor point like CGPointMake(x,y), where x and y are more or equal to 0 or less or equal to 1;
For example:
CGPoint selectionAnchorPoint = CGPointMake(0.15, 0.2);
Related
I have a UIScrollview (With image) in UIView (Red color).
UIView - {0,0, 320, 236} UIScrollview - {0, 8, 300, 220}
In my uiview, I got touches.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{}
I need to transfer touch from UIView to UIScrollview. (e.g if user swipe from right side of uiview to left, uiscrollview should scroll to left in sync with user touch). May I know how to do?
The idea is to get a reference to your scrollView inside your UIView, calculate the x touches delta and adjust the contentOffset property of the scrollView accordingly.
So, in your UIView class:
#implementation MyView{
CGPoint _startPosition;
CGPoint _previousPosition;
}
Initialize the above variables in your
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
_startPosition = [touch locationInView:self];
_previousPosition = _startPosition;
}
Then in your touchesMoved:
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touch locationInView:self.scrollView];
if(!CGPointEqualToPoint(_previousPosition, _startPosition)){
CGFloat deltaX = _previousPosition.x-currentPosition.x;
[UIView animateWithDuration:0.1 animations:^{
//
self.scrollView.contentOffset = CGPointMake(self.scrollView.contentOffset.x +
deltaX, self.scrollView.contentOffset.y);
}];
}
_previousPosition = currentPosition;
}
The scrollView.contentOffset is adjusted in an animation block to make the scroll smooth.
Link to a working project: https://github.com/sliaquat/stack_overlfow_answer_28036976
This is my first post so go easy haha.
I'm new to 'iOS' 'coding', 'Xcode' and 'spritekit'. I'm looking to make an image node "jump" a distance on the positive y-axis if I touch anywhere on the screen, although if I touch somewhere to the left or right if the image and hold for a certain time, it moves in the respective left or right direction, a distance respective to the length of the touch.
Not sure if that's very clear, but any help would be appreciated! Thanks!
You could move a node like this
In touchesEnded: or touchesBegan: method:
{
node.position.y += 50;
}
In order for sprite to move somewhere you could also use actions, there is a family of actions like moveTo action.
I would suggest picking upa tutorial or a book about sprite kit. Good site with free tutorials is raywenderlich.com
Please Try this code :
a sprite move : left/right according to your touch direction anywhere on screen
// CGPoint initialPos; // in .h file
-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint touchPt = [touch locationInView:touch.view];
initialPos = [[CCDirector sharedDirector] convertToGL:touchPt];
}
-(void) ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *myTouch=[touches anyObject];
CGPoint currentPos=[myTouch locationInView:[myTouch view]];
currentPos=[[CCDirector sharedDirector] convertToGL:currentPos];
float diffX = currentPos.x - initialPos.x;
float diffY = currentPos.y - initialPos.y;
CGPoint velocity = ccp(diffX, diffY);
initialPos = currentPos;
[Sprite setPosition:ccpAdd([SmileBall position], velocity)];
}
- (void) ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *myTouch=[touches anyObject];
CGPoint currentPos=[myTouch locationInView:[myTouch view]];
currentPos=[[CCDirector sharedDirector] convertToGL:currentPos];
float diffX = currentPos.x - initialPos.x;
float diffY = currentPos.y - initialPos.y;
CGPoint velocity = ccp(diffX, diffY);
initialPos = currentPos;
[Sprite setPosition:ccpAdd([SmileBall position], velocity)];
}
a sprite jump up: according to your touch on screen
-(void) ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
CCSprite *RunningChar;
RunningChar=(CCSprite *)[self getChildByTag:10];
UITouch *touch = [touches anyObject];
CGPoint touchPt = [touch locationInView:touch.view];
touchPt = [[CCDirector sharedDirector] convertToGL:touchPt];
float radian = ccpToAngle(ccpSub(touchPt, prevPoint));
float degrees = CC_RADIANS_TO_DEGREES(radian);
if (degrees >= 22.5 && degrees <= 112.5) // for upward direction :). otherwise you can write only code without ant condition
{
CCJumpTo *jump=[CCJumpTo actionWithDuration:0.7 position:CGPointMake(RunningChar.position.x, 87) height:110 jumps:1];
[RunningChar runAction:seq];
}
else
{
}
}
Try this :)
i try to run some code, when my finger is moved to the same position, where the imageview is.
I defined the position of the image view:
CGRect imagepos = myImage.frame;
And the position of actual touch position:
UITouch *myTouch = [[touches allObjects] objectAtIndex: 0];
CGPoint currentPos = [myTouch locationInView: self.view];
I tried withCGPointEqualToPoint it not worked. Then i tried with CGRectContainsPoint it also not worked, because, when imagepos and currentpos have the same x coordinates, my "some code" is running (my finger is not moved to the image, they had only the same x positions. Y positions are totally different).
How can I say, when my finger (also in the method touchesmoved) touch/is moved to/is at anywhere of the image, run some code or a method?
Thanks for Answers.
In your touchesBegan method, you can try something like this:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
if([touch view] == myImgView)
{
NSLog(#"My Image was touched");
}
}
This tells you when your ImageView is touched. Make sure you set userInteractionEnabled to YES in your imageView.
Hey try out below -
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
for (UITouch *touch in touches) {
CGPoint location = [touch locationInNode:self]; //Now you got current location of click or tap
if(location.y == YOUR_IMAGE_VIEW_POSITION_Y)
{
NSLog(#"Got the TOUCH...OOOoopsss !!!");
}
}
}
Hope this helped.
There is a function...
CGRectContainsPoint(rect, point);
It returns a bool if the point is inside the rect.
So get the touch point and run this with the imageView frame to find out if the touch was inside the image view.
Okay basically what this code currently does is drag an image up and down along the Y axis depending on where the user drags it, and it returns to its original position. My problem is that if someone were to not touch directly on the center of the UIImageView and start dragging it would jolt (very not smooth). Wherever someone is touching the UIImageView and starts dragging the UIImageView jolts a little to go directly on the center of the touch event.
I was thinking about using animation just to move it where the image needs to go, or is there another way?
I apologize if this is an inefficient way to do this. I'm fairly new to the IOS world.
Here's what I have:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
//Gets location of UIImageView.
self.originalFrame = self.foregroundImage.frame;
}
//This method is used for moving the UIImageView along the y axis depending on touch events.
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
if([touch view]==self.foregroundImage) {
CGPoint location = [touch locationInView:self.view];
location.x=self.foregroundImage.center.x;
self.foregroundImage.center=location;
}
}
//This method sets the UIImageView back to its original position.
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
CGRect newFrame = self.foregroundImage.frame;
newFrame.origin.y = self.originalFrame.origin.y;
[UIView animateWithDuration:1.1 animations:^{
self.foregroundImage.frame = newFrame;
}];
}
You also need to save the first location in touchesBegan, relative to the parent view. Then, you can use that to change the frame by the difference between the previous location and the new location. Please see the following code.
- (void) touchesBegan: (NSSet*) touches
withEvent: (UIEvent*) event
{
if (touches.count == 1)
{
UITouch* touch = [touches anyObject];
self.touchLocation = [touch locationInView: self.view];
}
}
- (void) touchesMoved: (NSSet*) touches
withEvent: (UIEvent*) event
{
if (touches.count == 1)
{
UITouch* touch = [touches anyObject];
CGPoint newTouchLocation = [touch locationInView: self.view];
if (touch.view == self.foregroundImage)
{
/* Determine the difference between the last touch locations */
CGFloat deltaX = newTouchLocation.x - self.touchLocation.x;
CGFloat deltaY = newTouchLocation.y - self.touchLocation.y;
/* Offset the foreground image */
self.foregroundImage.center
= CGPointMake(self.foregroundImage.center.x + deltaX,
self.foregroundImage.center.y + deltaY);
}
/* Keep track of the new touch location */
self.touchLocation = newTouchLocation;
}
}
I'm trying to move a UIView (let's call it viewA), which is located on top of another UIView (let's call it viewB). viewB has the size of the iPad screen, and view A is much much smaller.
I manage to move things, but the whole screen moves (viewA + viewB), not only viewA.
Here is my code for viewA class:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self->view];
if (CGRectContainsPoint(self.window.frame, touchLocation)) {
dragging = YES;
oldY = touchLocation.y;
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self->view];
if (dragging) {
CGRect frame = self.window.frame;
frame.origin.y = self.window.frame.origin.y + touchLocation.y - oldY;
self.window.frame = frame;
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
dragging = NO;
}
What I do not understand, is that, I implemented these methods in the viewA class. "Self" should concern this viewA, right? So why does the whole page move when my finger move on the screen?
You are moving the entire window, which contains all the views, you should only move the view you want, viewA in your case.