How will I hold and drag the image while it is moving? - ios

Question

Here is my code in moving the image randomly and for the touch code.
-(void)viewDidAppear:(BOOL)animated {
timer = [NSTimer scheduledTimerWithTimeInterval:5 target:self selector:#selector(randomizeXandY) userInfo:nil repeats:YES];
}
-(void)randomizeXandY {
CGFloat x = (CGFloat) (arc4random() % (int) self.view.bounds.size.width);
CGFloat y = (CGFloat) (arc4random() % (int) self.view.bounds.size.height);
[self moveObjectsAtX:x Y:y];
}
-(void)moveObjectsAtX:(CGFloat)x Y:(CGFloat)y {
[UIView animateWithDuration:5 animations:^{
imgView.center = CGPointMake(x, y);
}];
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches]anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
if ([touch view] == imgView) {
imgView.center = touchLocation;
}
}

Answer 1

Try the code in touchesBegin and touchesEnded
-(void)touchesBegin:(NSSet *)touches withEvent:(UIEvent *)event {
// stop timers here
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
// start timers here again
}

Answer 2

I would rather suggest to use UIPanGestureRecognizer. In it's handling method you can check possible states of the touch.
-(void)handlePan:(UIPanGestureRecognizer *)recognizer {
switch (recognizer.state) {
case UIGestureRecognizerStateBegan: {
CGPoint touchLocation = [recognizer locationInView:self.view];
...
break;
}
case UIGestureRecognizerStateChanged:
...
break;
case UIGestureRecognizerStateEnded:
...
break;
default:
break;
}

Answer 3

You have to use these methods:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
//...
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
//..
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
//...
}
in touchesBegan method, check if the touch is on your image:
if (CGRectContainsPoint(yourImage.frame, touchLocation)){
dragging = YES;
}
if it yes set a global variable, for example bool dragging to YES.
in touchesMoved:
check
if (dragging){
yourImage.frame = CGRectMake(touchLocation.x, touchLocation.y,yourImage.frame.size.widht,yourImage.frame.size.height);
}
in touchesEnded:
set dragging to NO
dragging = NO;
So :
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
if (CGRectContainsPoint(yourImage.frame, touchLocation)){
dragging = YES;
[timer invalidate];
timer = nil;
}
//...
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
if (dragging){
yourImage.frame = CGRectMake(touchLocation.x, touchLocation.y,yourImage.frame.size.widht,yourImage.frame.size.height);
}
//..
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
dragging = NO;
//...
}