I am trying to drag a UITextView object with touch ! but I have a problem , I need when user touches the custom view , the touching event begins, but touching methods works only on self.view . here is my code :
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(#"touch began ");
UITouch *touch = [touches anyObject];
startingX = [touch locationInView:_captureView].x;
startingY = [touch locationInView:_captureView].y;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint currentPoint = _mText.frame.origin;
float xForView, yForView;
UITouch *touch = [touches anyObject];
float newX = [touch locationInView:_captureView].x;
float deltaX;
if(startingX > newX){
deltaX = startingX - newX;
xForView = currentPoint.x - deltaX;
} else if(newX > startingX){
deltaX = newX - startingX;
xForView = currentPoint.x + deltaX;
} else xForView = currentPoint.x;
float newY = [touch locationInView:_captureView].y;
float deltaY;
if(startingY > newY){
deltaY = startingY - newY;
yForView = currentPoint.y - deltaY;
} else if(newY > startingY){
deltaY = newY - startingY;
yForView = currentPoint.y + deltaY;
} else yForView = currentPoint.y;
CGRect newFrame = CGRectMake(xForView, yForView, _mText.frame.size.width, _mText.frame.size.height);
_mText.frame = newFrame;
startingX = newX;
startingY = newY;
}
my textView is not editable all views are userInteractionEnabled
Write your touches began method and touches moved method inside the your custom text view and try to adjust the frame.
Related
I have an UIView inside main view controller which contain 1 imageview.i moved imageview with this method.
- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *aTouch = [touches anyObject];
if (aTouch.view == self.sub_View) {
CGPoint location = [aTouch locationInView:self.sub_View];
CGPoint previousLocation = [aTouch previousLocationInView:self.sub_View];
self.imageView.frame = CGRectOffset(self.imageView.frame, (location.x - previousLocation.x), (location.y - previousLocation.y));
}
}
Imageview move perfect. But i have to keep imageview inside UIView when i moved. Problem with this code is when i move imageview it is also moved outside UIView. I have to keep imageview inside UIView and movable only inside UIView.
Please help me to solve this. How to set boundary for imageview so it is movable only inside UIView.
Try below code.
- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *aTouch = [touches anyObject];
if (aTouch.view == self.sub_View) {
CGPoint location = [aTouch locationInView:self.sub_View];
CGPoint previousLocation = [aTouch previousLocationInView:self.sub_View];
CGRect newFrame = CGRectOffset(self.imageView.frame, (location.x - previousLocation.x), (location.y - previousLocation.y));
if(newFrame.origin.x < 0)
newFrame.origin.x = 0;
if(newFrame.origin.y < 0)
newFrame.origin.y = 0;
if(newFrame.origin.x + newFrame.size.width > self.frame.size.width)
newFrame.origin.x = self.frame.size.width - self.imageView.frame.size.width;
if(newFrame.origin.y + newFrame.size.height > self.frame.size.height)
newFrame.origin.y = self.frame.size.height - self.imageView.frame.size.height;
self.imageView.frame = newFrame;
}
}
a) You can set the clipsToBounds property of your UIView to YES
b) You can use the fallowing code for moving your UIImageView
self.imageView.center = CGPointMake(MAX(0.0, MIN(location.x - previousLocation.x, self.sub_View.bounds.size.width)), MAX(0.0, MIN(location.y - previousLocation.y, self.sub_View.bounds.size.height)));
I have an ImageView that moves around the UIView, is it possible to detect collision of the ImageView and the view its self? For example the ImageView hits the side of the view I want it to run an action. -(void)restart {}
If this is possible can you detect which side it has collided with?
You can create a custom UIImageVIew and implement the methods touchBegan and touchMoved (don't forget to add [self setUserInteractionEnabled:YES] in your init method). Then set the rect you want to interact with :
customImageView.interactRect = myView.frame;
And in your customImageView you can add something like:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [[event allTouches] anyObject];
lastPosition = [touch locationInView: self.superview];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [[event allTouches] anyObject];
CGPoint position = [touch locationInView:self.superview];
CGRect currentFrame = self.frame;
currentFrame.origin = CGPointMake(currentFrame.origin.x + position.x - lastPosition.x, currentFrame.origin.y + position.y - lastPosition.y);
if (CGRectIntersectsRect(currentFrame, interactRect) && !CGRectIntersectsRect(self.frame, interactRect))
{
NSLog(#"I'm in for the first time");
if(self.frame.origin.x + self.frame.size.width <= interactRect.origin.x && currentFrame.origin.x + currentFrame.size.width > interactRect.origin.x)
{
NSLog(#"Coming from the left");
}
if(self.frame.origin.x >= interactRect.origin.x + interactRect.size.width && currentFrame.origin.x < interactRect.origin.x + interactRect.size.width)
{
NSLog(#"Coming from the right");
}
}
self.frame = currentFrame;
lastPosition = position;
}
I am rotating imageView which is minuit hand of a clock, with
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
if ([touch view] == _imgViewMinuit)
{
NSLog(#"Touched");
_imgMinuitHand.transform = CGAffineTransformRotate(_imgMinuitHand.transform,DEGREES_RADIANS(6));
}
}
Now i want to rotate it as per my finger, clockwise/anticlockwise, with speed of my touch.
How I can achieve this ?
check this code
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch=[[event allTouches]anyObject];
[self transformSpinnerwithTouches:touch];
}
-(void)transformSpinnerwithTouches:(UITouch *)touchLocation
{
CGPoint touchLocationpoint = [touchLocation locationInView:self.view];
CGPoint PrevioustouchLocationpoint = [touchLocation previousLocationInView:self.view];
//origin is the respective piont from that i gonna measure the angle of the current position with respective to previous position ....
CGPoint origin;
origin.x = arrow.center.x;
origin.y = arrow.center.y;
CGPoint previousDifference = [self vectorFromPoint:origin toPoint:PrevioustouchLocationpoint];
CGAffineTransform newTransform = CGAffineTransformScale(arrow.transform, 1, 1);
CGFloat previousRotation = atan2(previousDifference.y, previousDifference.x);
CGPoint currentDifference = [self vectorFromPoint:origin toPoint:touchLocationpoint];
CGFloat currentRotation = atan2(currentDifference.y, currentDifference.x);
CGFloat newAngle = currentRotation- previousRotation;
temp1 = temp1 + newAngle;
//NSLog(#"temp1 is %f",temp1);
//NSLog(#"Angle:%F\n",(temp1*180)/M_PI);
newTransform = CGAffineTransformRotate(newTransform, newAngle);
[self animateView:arrow toPosition:newTransform];
}
-(void)animateView:(UIView *)theView toPosition:(CGAffineTransform) newTransform
{
arrow.transform = newTransform;
}
-(CGPoint)vectorFromPoint:(CGPoint)firstPoint toPoint:(CGPoint)secondPoint
{
CGFloat x = secondPoint.x - firstPoint.x;
CGFloat y = secondPoint.y - firstPoint.y;
CGPoint result = CGPointMake(x, y);
//NSLog(#"%f %f",x,y);
return result;
}
I'm trying to draw a ruller which follow the touches on the screen. On the first touch, I set the first point and on all the other, the ruller follow the finger on ther screen resizing and rotating around the first point depending on where the finger is.
I tried to do this :
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint p = [touch locationInView:self.view];
self.regleFirstPoint = p;
UIImageView* img = [[UIImageView alloc] initWithImage:self.regleImg];
img.frame = CGRectMake(self.regleFirstPoint.x, self.regleFirstPoint.y, 0, self.regleImg.size.height);
[self.view addSubview:img];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint p = [touch locationInView:self.view];
// Width
float deltaY = p.y - self.regleFirstPoint.y;
float deltaX = p.x - self.regleFirstPoint.x;
float width = sqrt((deltaX * deltaX) + (deltaY * deltaY));
// Angle
float angleInRadians = atanf(deltaY / deltaX);
float angleInDegrees = angleInRadians * 180 / M_PI; // JUST FOR INFO
NSLog(#"angle : %f / %f", angleInRadians, angleInDegrees);
// Resizing image
UIImageView* img = [self.regles lastObject];
img.frame = CGRectMake(self.regleFirstPoint.x, self.regleFirstPoint.y, width, self.regleImg.size.height/2);
img.center = self.regleFirstPoint;
CGAffineTransform transform = CGAffineTransformIdentity;
img.transform = CGAffineTransformRotate(transform, angleInRadians);
}
The ruller doesn't follow the finger correctly, I think I missed something. What's wrong with my code ?
EDIT : I also tried this after some researches :
// Resizing images
img.frame = CGRectMake(self.regleFirstPoint.x, self.regleFirstPoint.y, largeur, self.regleImg.size.height/2);
[img.layer setAnchorPoint:CGPointMake(self.regleFirstPoint.x / img.bounds.size.width, self.regleFirstPoint.y / img.bounds.size.height)];
img.transform = CGAffineTransformRotate(img.transform, angleInRadians);
This is just a question of order:
Set transform of your view to identity
Change the frame of your view
Finally, apply your transform
Here is an updated piece of code, just used an UIView instead of your image:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
// Hold first touch
self.regleFirstPoint = [touch locationInView:self.view];
// Reset view / image
_rulerView.transform = CGAffineTransformIdentity;
_rulerView.frame = CGRectMake(self.regleFirstPoint.x, self.regleFirstPoint.y, 0, CGRectGetHeight(_rulerView.frame));
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint p = [touch locationInView:self.view];
// Compute width
float deltaX = p.x - self.regleFirstPoint.x;
float deltaY = p.y - self.regleFirstPoint.y;
float width = sqrt((deltaX * deltaX) + (deltaY * deltaY));
// Compute angle
float angleInRadians = atan2(deltaY, deltaX);
NSLog(#"angle (rad) : %f", angleInRadians);
NSLog(#"angle (deg) : %f", angleInRadians * 180 / M_PI);
// First reset the transformation to identity
_rulerView.transform = CGAffineTransformIdentity;
// Set anchor point
_rulerView.layer.anchorPoint = CGPointMake(0.0f, 0.5f);
// Resizing view / image
_rulerView.frame = CGRectMake(self.regleFirstPoint.x, self.regleFirstPoint.y, width, CGRectGetHeight(_rulerView.frame));
// Reset the layer position to the first point
_rulerView.layer.position = self.regleFirstPoint;
// Apply rotation transformation
_rulerView.transform = CGAffineTransformMakeRotation(angleInRadians);
}
Hope that helps.
Cyril
I want to translate UIView in same direction as touch moves .
Please suggest.
Modify the touchesBegan and touchesMoved methods to be like the following
float oldX, oldY;
BOOL dragging;
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
if (CGRectContainsPoint(window.frame, touchLocation)) {
dragging = YES;
oldX = touchLocation.x;
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 = window.frame;
frame.origin.x = window.frame.origin.x + touchLocation.x - oldX;
frame.origin.y = window.frame.origin.y + touchLocation.y - oldY;
window.frame = frame;
}
oldX = touchLocation.x;
oldY = touchLocation.y;
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
dragging = NO;
}
Hope it help
Try to do like the code below. I'm not sure if it is a best solution for all direction translation.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
if ([touches count] != 1) return;
_swipeStartInX = [[touches anyObject] locationInView:self].x;
_swipeStartInY = [[touches anyObject] locationInView:self].y;
_swiping = YES;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
if (!_swiping || [touches count] != 1) return;
CGFloat swipeDistanceInX = [[touches anyObject] locationInView:self].x - _swipeStartInX;
CGFloat swipeDistanceInY = [[touches anyObject] locationInView:self].y - _swipeStartInY;
CGSize contentSize = self.frame.size;
[_yourView setFrame:CGRectMake(swipeDistanceInX - contentSize.width, swipeDistanceInY - contentSize.width, contentSize.width, contentSize.height)];
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
if (!_swiping) return;
// You can set the last position when touches end.
// E.g. You can set positions like slide page does, just the the origin of _yourView.
}
If you just want translate in vertical and horizontal direction, you can use UIScrolView instead. :)
You can just add this method to your subclassed UIView class.
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
[super touchesMoved:touches withEvent:event];
UITouch *touch = [touches anyObject];
CGPoint currentLocation = [touch locationInView:self];
CGPoint previousLocation= [touch previousLocationInView:self];
CGFloat deltaX = currentLocation.x - previousLocation.x;
CGFloat deltaY = currentLocation.y - previousLocation.y;
self.frame = CGRectMake(self.frame.origin.x + deltaX, self.frame.origin.y + deltaY, self.frame.size.width, self.frame.size.height);
}