IOS: drag uiimageview only in one direction - ios

Question

I want to drag an uiimageview only in horizontal from a point1 to a point2; how can I do it?

Answer 1

you can use somting like this:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
touchStart = [[touches anyObject] locationInView:/*your main view*/];
point1 = CGPointMake(140, 140);
oldrect = imgview.rect;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
CGPoint point = [[touches anyObject] locationInView:/*your main view*/];
imgview.center = CGPointMake(imgview.center.x + point.x - touchStart.x, imgview.center.y);
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
CGPoint point = [[touches anyObject] locationInView:/*your main view*/];
[UIView animateWithDuration:0.25
animations:^{
if (((point1.x -15) > point.x) && ((point1.x + 15 ) < point.x) {
Imgview.rect = CGRectMake(point.x, point.x, imgview.frame.size.width,imgview.frame.size.height);
}
else {Imgview.rect = oldrect;}
completion:^(BOOL finished){ }];} }

Answer 2

Simple, check your imageView x position and your touch x position
float lastX = myimageview.center.x;
if the touch point x is bigger than lastX (or smaller, depends on the direction you want)
{
// Do the move
} else {
// Do nothing
}
Your code should look something like that :
- (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event {
// Move relative to the original touch point
CGPoint pt = [[touches anyObject] locationInView:self];
float lastX = myimageview.center.x;
if (pt.x > lastX){
// move myimageview.x to pt.x
}
}