I want to scroll the image that is inside my UIImageView in case my finger is inside the UIImageView area and i'm moving my finger. I'm trying to do that using objective c. I got it moving, but it act weird and dont work right. Can you please show me how to do that please???
This is what i'm doing:
- (void)touchesMoved :(NSSet *)touches withEvent:(UIEvent *)event{
for (UITouch *touch in touches) {
CGPoint touchLocation = [touch locationInView:self];
for (id sublayer in view_shape.sublayers) {
if (sublayer ==imageView.layer) {
if (CGRectContainsPoint(imageView.frame, touchLocation)) {
imageView.layer.contentsRect = CGRectMake( touchLocation.x/1000,
touchLocation.y/1000,
imageView.layer.contentsRect.size.width,
imageView.layer.contentsRect.size.height);
}
}
}
}
}
Why not use a scrollView and just add the imageView to it
You can't do this with just an instance of UIImageView. An image view will just hold on to an image and draw that.
Either add that inside a scrollview if you want a simple scroll/paging interface.
(or)
Add that to a UIView, and declare a UIPanGestureRecognizer to the UIView, and check the actions you get. Based on the translation, you can set the frame for the UIImageView.
Related
I am trying to figure out how I can determine if my touchpoint is where I have a UIView as subview or not. The background is UIView itself that I am adding multiple other UIViews to ... So as I long press and am changing the position while holding the touch, I'd like to know if there's a UIView at that point or not.
I have been thinking, still not clear how to go about it but came across this which makes me think of getting the indexes of hierarchy and check of it is larger than 1. But how could I do that for where I'm touching?
Any hint or clue would be appreciated.
You have to store both reference in two objects myParentView and mySubView now just use this method..
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
CGPoint locationPoint = [[touches anyObject] locationInView: myParentView];
UIView* viewYouWishToObtain = [self hitTest:locationPoint withEvent:event];
if(mySubView == viewYouWishToObtain){
//That view is touched
}else{
//That view is not touched
}
}
I'm working on an iOS app.
I have a UIView that is being animated. It keeps moving from left to right.
This view has several UIView children. They move within their parent when this is being animated.
When I try to capture user touches on the children (by using a UITapGestureRecognizer), it doens't work as expected. It sort of detect some touches on the children, but not in the position where they currently are.
I've been struggling with this for a while now. Any ideas about how to solve this? I really need to detect which children the user is touching.
Thanks!
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInView:self];
// Check every child subview
for (UIView *tickerItem in self.subviews)
{
// Check collision
if ([tickerItem.layer.presentationLayer hitTest:touchLocation])
{
MKTickerItemView *v = (MKTickerItemView*)tickerItem;
NSLog(#"Selected: %#", v.title);
// This button was hit whilst moving - do something with it here
break;
}
}
}
There is a UIViewAnimationOptions value...
UIViewAnimationOptionAllowUserInteraction
You can use this in the [UIView animateWithDuration... code.
This will enable the touch.
I have a UITableView that has a UIImageView which traverses it one row at a time at the click of a button (up/down). What I would like to do now is allow the user to drag the UIImageView up or down the table ONLY (i.e. no sideways movement). If majority of the UIImageView is over a particular cell, then when the user lets go of their finger, then I want the UIImageView to link to that row. Here is an image of the UITableView, with the UIImageView:
The scroll bar is the UIImageView that needs to move or down. I realize that I am supposed to implement the following methods:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
// We only support single touches, so anyObject retrieves just that touch from touches.
UITouch *touch = [touches anyObject];
if ([touch view] != _imageView) {
return;
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
if ([touch view] == _imageView) {
return;
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
//here is where I guess I need to determine which row contains majority of the scrollbar. This would only measure the y coordinate value, and not the x, since it will only be moving up or down.
return;
}
}
However, I am not sure HOW to achieve this functionality. I have tried to find similar examples online, and I have looked at the MoveMe example code from Apple, but I am still stuck. Please also note that my scroll bar is NOT the exact same size as a row in the table, but rather, a bit longer, but with the same height.
Thanks in advance to all who reply
Try adding a UIPanGestureRecognizer to the UIImageView. Start by getting the image view's current location, then use the translationInView method to determine where to move the image view.
From Apple's documentation:
If you want to adjust a view's location to keep it under the user's
finger, request the translation in that view's superview's coordinate
system... Apply the translation value to the state of the view when the gesture is first recognized—do not concatenate the value each time the handler is called.
Here's the basic code to add the gesture recognizer:
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(panView:)];
[imageView addGestureRecognizer:panGesture];
Then, do the math to determine where to move the view.
- (void)panView:(UIPanGestureRecognizer*)sender
{
CGPoint translation = [sender translationInView:self];
// Your code here - change the frame of the image view, and then animate
// it to the closest cell when panning finishes
}
Just like the title ,when I touch the UIView I want the touch point to be glow, I came up with a idea that to show a glow image on the touch point ，but if by code？any example or idea？thanks for sharing!!
You can try touchesBegan event below Code:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
if([touch view] ==self.my_view)//Check click your uiview or not
{
CGRect frame = [your_image_view frame];
CGPoint touchLocation = [touch locationInView:touch.view];
frame.origin.x=touchLocation.x;
frame.origin.y=touchLocation.y;
[your_image_view setFrame:frame];
[self.my_view addSubview:your_image_view];
}
}
Thanks..!
Well the first step would be to detect the touch on your UIView for that I would recommend using the high level API UIGestureRecognizer andd add to your view. Then you can use the call back to do whatever you want, perhaps some sort of animation?. If so you can use an animation block to animate your changes.
If I draw a rectangle on a frame and then I want to drag this rectangle to different positions on this frame. How could I do this? Please add comments if my description is unclear. It might be a bit confusing.
You can create a UIView with any background image and move it on a window by setting its frame as yourView.center = CGPointMake(x,y);
You can detect the point of touch using any/all of touchesBegan , touchesMoved or touchesEnded methods as follows :
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch =[touches anyObject];
CGPoint currentPoint =[touch locationInView:self.view];//point of touch
}
These methods are to be declared in a UIViewController. As sample code, you can refer to my github project in which I drag an item from one UITableView to another UITableView which I've accomplished using UIViews.