On a UITableView, I used Custom Cells with this code:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
gestureStartPoint = [touch locationInView:self.contentView];
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touch locationInView:self.contentView];
CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x);
CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y);
if(deltaX < kMinimumGestureLength && deltaY < kMaximumVariance&&!swiped){
//do something
NSLog(#"Tapped %d",indexRow);
//return YES;
} else if(deltaX < kMinimumGestureLength && deltaY < kMaximumVariance&&swiped) {
swiped = FALSE;
}
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touch locationInView:self.contentView];
CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x);
CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y);
if(deltaX >= kMinimumGestureLength && deltaY <= kMaximumVariance){
//do something
NSLog(#"Swiped %d",indexRow);
gestureStartPoint = [touch locationInView:self.contentView];
swiped = TRUE;
}
else if(deltaY >= kMinimumGestureLength && deltaX <= kMaximumVariance){
//do something
}
}
Before I added this, didSelectRowAtIndexPath was being called, however, now it is not. I can comment out the section and it works fine. Anyone know a way to fix this?
EDIT: Posting the working code
Customcell.h
#define kMinimumGestureLength 30
#define kMaximumVariance 5
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#interface CustomCell : UITableViewCell {
UILabel *primaryLabel;
UILabel *secondaryLabel;
UIImageView *myImageView;
CGPoint gestureStartPoint;
int indexRow;
BOOL swiped;
}
#property(nonatomic,retain)UILabel *primaryLabel;
#property(nonatomic,retain)UILabel *secondaryLabel;
#property(nonatomic,retain)UIImageView *myImageView;
#end
CustomCell.m
#import "CustomCell.h"
#implementation CustomCell
#synthesize primaryLabel,secondaryLabel,myImageView;
- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
- (void)layoutSubviews {
[super layoutSubviews];
CGRect contentRect = self.contentView.bounds;
CGFloat boundsX = contentRect.origin.x;
CGRect frame;
frame= CGRectMake(boundsX+10 ,0, 50, 50);
myImageView.frame = frame;
frame= CGRectMake(boundsX+70 ,5, 200, 25);
primaryLabel.frame = frame;
frame= CGRectMake(boundsX+70 ,30, 100, 15);
secondaryLabel.frame = frame;
}
- (id)initWithFrame:(CGRect)frame reuseIdentifier:(NSString *)reuseIdentifier indexd:(int)indexd {
if (self = [super initWithFrame:frame reuseIdentifier:reuseIdentifier]) {
// Initialization code
primaryLabel = [[UILabel alloc]init];
primaryLabel.textAlignment = UITextAlignmentLeft;
primaryLabel.font = [UIFont systemFontOfSize:14];
secondaryLabel = [[UILabel alloc]init];
secondaryLabel.textAlignment = UITextAlignmentLeft;
secondaryLabel.font = [UIFont systemFontOfSize:8];
myImageView = [[UIImageView alloc]init];
[self.contentView addSubview:primaryLabel];
[self.contentView addSubview:secondaryLabel];
[self.contentView addSubview:myImageView];
indexRow = indexd;
}
swiped = false;
return self;
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
gestureStartPoint = [touch locationInView:self.contentView];
// [super touchesbegan];
[super touchesBegan:touches withEvent:event];
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touch locationInView:self.contentView];
CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x);
CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y);
if(deltaX < kMinimumGestureLength && deltaY < kMaximumVariance&&!swiped){
//do something
NSLog(#"Tapped %d",indexRow);
[super touchesEnded:touches withEvent:event];
//return YES;
} else if(deltaX < kMinimumGestureLength && deltaY < kMaximumVariance&&swiped) {
swiped = FALSE;
}
//[super touchesEnded];
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touch locationInView:self.contentView];
CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x);
CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y);
if(deltaX >= kMinimumGestureLength && deltaY <= kMaximumVariance){
//do something
NSLog(#"Swiped %d",indexRow);
gestureStartPoint = [touch locationInView:self.contentView];
swiped = TRUE;
//[self.superview.dataSource editCell];
}
else if(deltaY >= kMinimumGestureLength && deltaX <= kMaximumVariance){
//do something
}
//[super touchesMoved];
}
#end
I'm not 100% certain, but I think you need to call the super methods in order to continue to have the default behavior.
[super touchesBegan:...];
[super touchesEnded:...];
[super touchesMoved:...];
Each in it's own method.
This seems to be similar to this question. try calling the parent methods with [super touchesbegan] et al.
Related
I wanna draw the transparent area with brush, but my code work not very well.I think someone can help me here. My code :
// Handles the start of a touch
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
CGRect bounds = [self bounds];
UITouch *touch = [[event touchesForView:self] anyObject];
if (![image isPointTransparent:[touch locationInView:self]]
|| ![image isPointTransparent:[touch previousLocationInView:self]])
{
return;
}
firstTouch = YES;
// Convert touch point from UIView referential to OpenGL one (upside-down flip)
location = [touch locationInView:self];
location.y = bounds.size.height - location.y;
}
// Handles the continuation of a touch.
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
CGRect bounds = [self bounds];
UITouch *touch = [[event touchesForView:self] anyObject];
if (![image isPointTransparent:[touch locationInView:self]]
|| ![image isPointTransparent:[touch previousLocationInView:self]])
{
return;
}
// Convert touch point from UIView referential to OpenGL one (upside-down flip)
if (firstTouch)
{
firstTouch = NO;
previousLocation = [touch previousLocationInView:self];
previousLocation.y = bounds.size.height - previousLocation.y;
}
else
{
location = [touch locationInView:self];
location.y = bounds.size.height - location.y;
previousLocation = [touch previousLocationInView:self];
previousLocation.y = bounds.size.height - previousLocation.y;
}
// Render the stroke
[self renderLineFromPoint:previousLocation toPoint:location];
}
// Handles the end of a touch event when the touch is a tap.
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
CGRect bounds = [self bounds];
UITouch *touch = [[event touchesForView:self] anyObject];
if (![image isPointTransparent:[touch locationInView:self]] || ![image isPointTransparent:[touch previousLocationInView:self]])
{
return;
}
if (firstTouch)
{
firstTouch = NO;
previousLocation = [touch previousLocationInView:self];
previousLocation.y = bounds.size.height - previousLocation.y;
[self renderLineFromPoint:previousLocation toPoint:location];
}
}
The important thing to know is that you should do your actual drawing in the drawRect: of your UIView. So the renderLineFromPoint:toPoint: method in your code should just be building up an array of lines and telling the view to redraw each time, something like this:
- (void)renderLineFromPoint:(CGPoint)from toPoint:(CGPoint)to
{
[lines addObject:[Line lineFrom:from to:to]];
[self setNeedsDisplay];
}
This assumes that you have a Line class which has 2 CGPoint properties. Your drawRect: may look something like this:
- (void)drawRect:(CGRect)rect
{
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetRGBStrokeColor(context, 0.0f, 0.0f, 0.0f, 1.0f);
for (Line *line in lines) {
CGContextMoveToPoint(context, line.from.x, line.from.y);
CGContextAddLineToPoint(context, line.to.x, line.to.y);
CGContextStrokePath(context);
}
}
If you do it like this (without OpenGL) there is no need to flip the y-axis.
The only thing left is to implement the isPointTransparent: method. It's difficult to know from your code how this should work.
structure
UIViewController
- UIScrollview
- UIButton
I'm going to make scrollview can receive button event. So whenever user do scrolling(dragging) on the button, the scrollview react as scrolling itself.
I made button down and moved handler with event forwarding like below
- (IBAction)buttonTouchedMove:(id)sender withEvent:(UIEvent *)event {
[[sender nextResponder] touchesMoved:[event allTouches] withEvent:event];
}
- (IBAction)buttonTouchedDown:(id)sender withEvent:(UIEvent *)event {
[[sender nextResponder] touchesBegan:[event allTouches] withEvent:event];
}
and to move scrollview as touches change, I made below codes
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
self.oldPoint = [touch locationInView:self.view];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
CGPoint offset = self.scrollView1.contentOffset;
UITouch *touch = [touches anyObject];
self.newPoint = [touch locationInView:self.view];
int diffX = newPoint.x - oldPoint.x;
offset.x = offset.x - diffX;
[scrollView1 setContentOffset:offset animated:YES];
self.oldPoint = self.newPoint;
}
but, scrollview react strange.. not move enough as I touch moved.
// get the button width
CGFloat buttonWidth = self.theButton.frame.size.width;
// replace your button name here
// now get the view width
CGFloat viewWidth = self.view.frame.size.width;
// replace your view name here
// now get the multiplier which i said u as 10
CGFloat mult = viewWidth / buttonWidth;
// and now use it in your code
.
.
.
diffX = mult*(newPoint.x - oldPoint.x);
.
.
.
Final answer, Using UIView animation, I got what i want.
- (IBAction)buttonTouchedDown:(id)sender withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
self.oldPoint = [touch locationInView:self.view];
self.velocity = 0;
isButtonTouchedDown = YES;
}
- (IBAction)buttonTouchedMove:(id)sender withEvent:(UIEvent *)event {
CGPoint offset = self.scrollView1.contentOffset;
UITouch *touch = [[event allTouches] anyObject];
self.newPoint = [touch locationInView:self.view];
int diffX = self.newPoint.x - self.oldPoint.x;
velocity = diffX;
offset.x = offset.x - diffX;
[self.scrollView1 setContentOffset:offset animated:NO];
self.oldPoint = self.newPoint;
}
There is a trick..I calculated velocity by differentiating moved distance in TouchedMove function.
In Button TouchUp event handler, I controlled Scrollview with velocity value and CurveEaseout animation to scroll more. By offering very short duration of animation and repeating it if there is no event(button touched down). It becomes very similar with scrollview's animation.
- (IBAction)buttonTouchedUp:(id)sender withEvent:(UIEvent *)event {
CGPoint offset = self.scrollView1.contentOffset;
amountX = (self.velocity)*(abs(self.velocity));
dX = amountX;
isButtonTouchedDown = NO;
if (offset.x - amountX < 0) {
offset.x = 0;
[scrollView1 setContentOffset:offset animated:YES];
}
else if (abs(dX) < 70) { // 70: content item size
offset.x = roundf(offset.x/70)*70;
[scrollView1 setContentOffset:offset animated:YES];
}
else {
[self endScrollAnimation];
}
- (void)startAnimation:(float)x moveAmount:(float)moveAmount
{
CGPoint offset = self.scrollView1.contentOffset;
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:duration];
offset.x = x < 0 ? offset.x + moveAmount : offset.x -moveAmount;
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:#selector(endScrollAnimation)];
[scrollView1 setContentOffset:offset animated:NO];
[UIView commitAnimations];
}
- (void)endScrollAnimation
{
CGPoint offset = self.scrollView1.contentOffset;
float slowMoveAmount = abs(amountX) * 0.05;
float fastMoveAmount = abs(amountX) * 0.1;
if (isButtonTouchedDown) {
return;
}
else if (abs(dX) > abs(amountX)*0.35 && offset.x > 0) {
[self startAnimation:dX moveAmount:fastMoveAmount];
dX = dX < 0 ? dX + fastMoveAmount : dX -fastMoveAmount;
}
else if (abs(dX) > slowMoveAmount && offset.x > 0) {
[self startAnimation:dX moveAmount:slowMoveAmount];
dX = dX < 0 ? dX + slowMoveAmount : dX - slowMoveAmount;
}
else {
offset.x = roundf(offset.x/70)*70;
[scrollView1 setContentOffset:offset animated:YES];
}
}
I am trying to figure out how I can set a button to not be highlighted when touchesmoved leaves the frame of the current selected button. See code below. The below code should allow any of the three buttons to be pressed individually and swipped. The problem I am having is that when the buttons a swipped eg using touchesmoved the buttons call the Actions but never set the buttons back to not be highlighted when the swipe leaves the button frame.
Thanks in advance,
Azza
- (void)touchesMoved: (NSSet *)touches withEvent:(UIEvent *)event {
for(UITouch *t in touches) {
CGPoint location = [t locationInView:t.view];
if((CGRectContainsPoint(Button1.frame, location)) && (!Button1.isHighlighted))
{
if (!Button1.isHighlighted){
[Button1 setHighlighted:YES];
[self doAction1];
}else{
[Button1 setHighlight:NO];
}
}
if((CGRectContainsPoint(Button2.frame, location)) && (!Button2.isHighlighted))
{
if (!Button2.isHighlighted){
[Button2 setHighlighted:YES];
[self doAction2];
}else{
[Button2 setHighlight:NO];
}
}
if((CGRectContainsPoint(Button3.frame, location)) && (!Button3.isHighlighted))
{
if (!Button3.isHighlighted){
[Button3 setHighlighted:YES];
[self doAction3];
}else{
[Button3 setHighlight:NO];
}
}
}
- (void)touchesBegan: (NSSet *)touches withEvent:(UIEvent *)event {
for(UITouch *t in touches) {
CGPoint location = [t locationInView:t.view];
if(CGRectContainsPoint(Button1.frame, location))
{
if (!Button1.isHighlighted){
[Button1 setHighlighted:YES];
[self doAction1];
}
}
if(CGRectContainsPoint(Button2.frame, location))
{
if (!Button2.isHighlighted){
[Button2 setHighlighted:YES];
[self doAction2];
}
}
if(CGRectContainsPoint(Button3.frame, location))
{
if (!Button3.isHighlighted){
[Button3 setHighlighted:YES];
[self doAction3];
}
}
}
- (void)touchesEnded: (NSSet *)touches withEvent:(UIEvent *)event {
for (UITouch *t in touches){
CGPoint location = [t locationInView:self.view];
if(CGRectContainsPoint(Button1.frame, location)) {
[Button1 setHighlighted:NO];
} else if(CGRectContainsPoint(Button2.frame, location)) {
[Button2 setHighlighted:NO];
} else if(CGRectContainsPoint(Button3.frame, location)) {
[Button3 setHighlighted:NO];
}
}
}
OK, I know I've handled this same issue before. I also see a reference to it in my own comments in the code. I've attached a chunk of very old code that I wrote to handle simulated buttons (similar to what you are doing). Maybe looking through this will help:
typedef struct {
BOOL enabled;
BOOL isActivated;
NSTimeInterval activatedStartTime;
NSTimeInterval holdTime;
CGRect frame;
UIImageView *glowImage;
BOOL processPending;
SEL callWhenTouched;
} SIM_BUTTON;
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
int fingers = [touches count];
UITouch *touch;
CGPoint touchPoint;
int i, j;
for (i=0; i<fingers; i++)
{
touch = [[touches allObjects] objectAtIndex:i];
touchPoint = [touch locationInView:self.view];
for ( j=0; j<SIM_BUTTON_COUNT; j++)
{
if ( simButton[j].enabled && CGRectContainsPoint( simButton[j].frame, touchPoint) )
{
simButton[j].isActivated=YES;
simButton[j].activatedStartTime = [NSDate timeIntervalSinceReferenceDate];
simButton[j].processPending = YES;
}
}
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
int fingers = [touches count];
UITouch *touch;
CGPoint touchPoint;
CGPoint previousTouchPoint;
int i, j;
for (i=0; i<fingers; i++)
{
touch = [[touches allObjects] objectAtIndex:i];
touchPoint = [touch locationInView:self.view];
previousTouchPoint = [touch previousLocationInView:self.view];
for ( j=0; j<SIM_BUTTON_COUNT; j++)
{
if ( simButton[j].enabled && simButton[j].isActivated && CGRectContainsPoint( simButton[j].frame, touchPoint) && CGRectContainsPoint( simButton[j].frame, previousTouchPoint) )
{
simButton[j].isActivated=YES;
}
else
if ( simButton[j].enabled && !simButton[j].isActivated && CGRectContainsPoint( simButton[j].frame, touchPoint) && CGRectContainsPoint( simButton[j].frame, previousTouchPoint) )
{
simButton[j].activatedStartTime = [NSDate timeIntervalSinceReferenceDate];
simButton[j].isActivated=YES;
}
else
if ( simButton[j].enabled && simButton[j].isActivated && !CGRectContainsPoint( simButton[j].frame, touchPoint) && CGRectContainsPoint( simButton[j].frame, previousTouchPoint) )
{
simButton[j].isActivated=NO;
simButton[j].activatedStartTime = (NSTimeInterval)0.0;
}
else
if ( simButton[j].enabled && !simButton[j].isActivated && CGRectContainsPoint( simButton[j].frame, touchPoint) && !CGRectContainsPoint( simButton[j].frame, previousTouchPoint) )
{
simButton[j].isActivated=YES;
simButton[j].activatedStartTime = [NSDate timeIntervalSinceReferenceDate];
simButton[j].processPending = YES;
}
//
// If the user touched the SCAN button and then slid their finger off of the SCAN button
//
if ( scannerActive==YES && simButton[RIGHT_SCAN_BUTTON].isActivated==NO && CGRectContainsPoint( simButton[RIGHT_SCAN_BUTTON].frame, previousTouchPoint) )
{
phraseMode = EXTERNAL_SCAN_PHRASES; // Default
}
}
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
int fingers = [touches count];
UITouch *touch;
CGPoint touchPoint;
CGPoint previousTouchPoint;
int i, j;
for (i=0; i<fingers; i++)
{
touch = [[touches allObjects] objectAtIndex:i];
touchPoint = [touch locationInView:self.view];
previousTouchPoint = [touch previousLocationInView:self.view];
for ( j=0; j<SIM_BUTTON_COUNT; j++)
{
if ( simButton[j].enabled && simButton[j].isActivated && (CGRectContainsPoint( simButton[j].frame, touchPoint) || CGRectContainsPoint( simButton[j].frame, previousTouchPoint)) )
{
simButton[j].isActivated=NO;
simButton[j].activatedStartTime = (NSTimeInterval)0.0;
}
}
}
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
[self touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event];
}
In touchesBegan:
CGPoint touch_point = [[touches anyObject] locationInView:self.view];
There are tens of UIImageView around, stored in a NSMutableArray images. I'd like to know is there a built-in function to check if a CGPoint (touch_point) is inside one of the images, e.g.:
for (UIImageView *image in images) {
// how to test if touch_point is tapped on a image?
}
Thanks
Follow up:
For unknown reason, pointInside never returns true. Here is the full code.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
touch_point = [touch locationInView:self.view];
for (UIImageView *image in piece_images) {
if ([image pointInside:touch_point withEvent:event]) {
image.hidden = YES;
} else {
image.hidden = NO;
}
NSLog(#"image %.0f %.0f touch %.0f %.0f", image.center.x, image.center.y, touch_point.x, touch_point.y);
}
}
although I can see the two points are sometimes identical in the NSLog output.
I also tried:
if ([image pointInside:touch_point withEvent:nil])
the result is the same. never returns a true.
To eliminate the chance of anything goes with with the images. I tried the following:
if (YES or [image pointInside:touch_point withEvent:event])
all images are hidden after the first click on screen.
EDIT 2:
Really weird. Even I hard coded this:
point.x = image.center.x;
point.y = image.center.y;
the code becomes:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint point; // = [touch locationInView:self.view];
for (UIImageView *image in piece_images) {
point.x = image.center.x;
point.y = image.center.y;
if ([image pointInside:point withEvent:event]) {
image.hidden = YES;
NSLog(#"YES");
} else {
image.hidden = NO;
NSLog(#"NO");
}
NSLog(#"image %.0f %.0f touch %.0f %.0f", image.center.x, image.center.y, point.x, point.y);
}
}
pointInside always returns false ...
Sounds to me like the problem is you need to convert coordinates from your view's coordinates to the UIImageView's coordinates. You can use UIView's convertPoint method.
Try replacing
if ([image pointInside:touch_point withEvent:event]) {
with
if ([image pointInside: [self.view convertPoint:touch_point toView: image] withEvent:event]) {
(Note that you are allowed to pass nil instead of event.)
I guess this is a bit late for the questioner, but I hope it is of use to someone.
if ([image pointInside:touch_point withEvent:event]) {
// Point inside
}else {
// Point isn't inside
}
In this case event is taken from :
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:self.view];
for (UIImageView *piece in piece_images) {
CGFloat x_min = piece.center.x - (piece.bounds.size.width / 2);
CGFloat x_max = x_min + piece.bounds.size.width;
CGFloat y_min = piece.center.y - (piece.bounds.size.height / 2);
CGFloat y_max = y_min + piece.bounds.size.height;
if (point.x > x_min && point.x < x_max && point.y > y_min && point.y < y_max ) {
piece.hidden = YES;
} else {
piece.hidden = NO;
}
}
}
too bad, I have do it myself...
it's OS 3.2, XCode 3.2.2, tried both on simulator and iPad
I am doing multi touch on UImageView means zoom in and zoom out on image view. I am using followng code but it doesn't work very well. Can anyone look at this code,
#import "ZoomingImageView.h"
#implementation ZoomingImageView
#synthesize zoomed;
#synthesize moved;
define HORIZ_SWIPE_DRAG_MIN 24
define VERT_SWIPE_DRAG_MAX 24
define TAP_MIN_DRAG 10
CGPoint startTouchPosition;
CGFloat initialDistance;
- (id)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
// Initialization code
moved = NO;
zoomed = NO;
}
return self;
}
- (void)drawRect:(CGRect)rect {
// Drawing code
}
- (void)dealloc {
if([timer isValid])
[timer invalidate];
[super dealloc];
}
- (void) setImage: (UIImage*)img
{
zoomed = NO;
moved = NO;
self.transform = CGAffineTransformIdentity;
[super setImage:img];
}
- (CGFloat)distanceBetweenTwoPoints:(CGPoint)fromPoint toPoint:(CGPoint)toPoint {
float x = toPoint.x - fromPoint.x;
float y = toPoint.y - fromPoint.y;
return sqrt(x * x + y * y);
}
- (CGFloat)scaleAmount: (CGFloat)delta {
CGFloat pix = sqrt(self.frame.size.width * self.frame.size.height);
CGFloat scale = 1.0 + (delta / pix);
return scale;
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
if([timer isValid])
[timer invalidate];
moved = NO;
switch ([touches count]) {
case 1:
{
// single touch
UITouch * touch = [touches anyObject];
startTouchPosition = [touch locationInView:self];
initialDistance = -1;
break;
}
default:
{
// multi touch
UITouch *touch1 = [[touches allObjects] objectAtIndex:0];
UITouch *touch2 = [[touches allObjects] objectAtIndex:1];
initialDistance = [self distanceBetweenTwoPoints:[touch1 locationInView:self]
toPoint:[touch2 locationInView:self]];
break;
}
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch1 = [[touches allObjects] objectAtIndex:0];
if([timer isValid])
[timer invalidate];
/*if ([touches count] == 1) {
CGPoint pos = [touch1 locationInView:self];
self.transform = CGAffineTransformTranslate(self.transform, pos.x - startTouchPosition.x, pos.y - startTouchPosition.y);
moved = YES;
return;
}****/
if ((initialDistance > 0) && ([touches count] > 1)) {
UITouch *touch2 = [[touches allObjects] objectAtIndex:1];
CGFloat currentDistance = [self distanceBetweenTwoPoints:[touch1 locationInView:self]
toPoint:[touch2 locationInView:self]];
CGFloat movement = currentDistance - initialDistance;
NSLog(#"Touch moved: %f", movement);
CGFloat scale = [self scaleAmount: movement];
self.transform = CGAffineTransformScale(self.transform, scale, scale);
// }
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch1 = [[touches allObjects] objectAtIndex:0];
if ([touches count] == 1) {
// double tap to reset to default size
if ([touch1 tapCount] > 1) {
if (zoomed) {
self.transform = CGAffineTransformIdentity;
moved = NO;
zoomed = NO;
}
return;
}
}
else {
// multi-touch
UITouch *touch2 = [[touches allObjects] objectAtIndex:1];
CGFloat finalDistance = [self distanceBetweenTwoPoints:[touch1 locationInView:self]
toPoint:[touch2 locationInView:self]];
CGFloat movement = finalDistance - initialDistance;
NSLog(#"Final Distance: %f, movement=%f",finalDistance,movement);
if (movement != 0) {
CGFloat scale = [self scaleAmount: movement];
self.transform = CGAffineTransformScale(self.transform, scale, scale);
NSLog(#"Scaling: %f", scale);
zoomed = YES;
}
}
}
- (void)singleTap: (NSTimer*)theTimer {
// must override
}
- (void)animateSwipe: (int) direction {
// must override
}
It is not working fine on device. can anyone tell that where i am wrong.
When you use any CGAffinTransform.... the value of the frame property becomes undefined. In your code you are using the frame.size.width and frame.size.height to calculate the change in size. After the first iteration of CGAffinTransformScale you would not get the right scale factor. According to the documentation bounds would be the right property for scale calculations.