Okay, I have been all over the internet trying to find the answer to this, I am trying to create a custom UIScrollView scroller.
Here is a link to a picture of the scroller
http://postimage.org/image/cg2jvde9z/
http://postimage.org/image/ko0mp3kdj/
(that white box is just for me to test the scrollview)
I have gotten the scroller to work, although I need help figuring out how many pixels the scrollview should move every time the scroller is pushed
here is some code
-(IBAction)scroller_bar:(id)sender withEvent:(UIEvent *)event{
UIButton *button_sent = (UIButton *)sender;
UITouch *touch = [[event touchesForView:button_sent] anyObject];
CGPoint previousLocation = [touch previousLocationInView:button_sent];
CGPoint location = [touch locationInView:button_sent];
CGFloat delta_x = location.x - previousLocation.x;
float left_side = button_sent.center.x + delta_x;
float right_side = button_sent.center.x + delta_x;
if (right_side > button_sent.center.x) {
scroll_right = YES;
}
else{
scroll_right = NO;
}
if (left_side <= 13 + 50.5 || right_side >= 307 - 50.5) {
}
else{
button_sent.center = CGPointMake(button_sent.center.x + delta_x,
button_sent.center.y);
if (scroll_right) {
[selection_scroll setContentOffset:CGPointMake(selection_scroll.contentOffset.x - (Help HERE!), selection_scroll.contentOffset.y) animated:YES];
}
else{
[selection_scroll setContentOffset:CGPointMake(selection_scroll.contentOffset.x + (Help HERE!), selection_scroll.contentOffset.y) animated:YES];
}
}
}
In the above code you should see a '(Help HERE!)',
that is where i am trying to figure out how many pixels i should move the scroll view. This is a bit of a confusing question, hope you understand.
Thanks :)
I don't know whether APPLE will approve this or not but the code written below can change the scollView 's scroller images
for (UIImageView *img in yourscrollView.subviews) {
[img setImage:[UIImage imageNamed:#"your custom scroller image"]];
}
Related
I have a scroll view with a fixed number of thumbnail images added as subview. I want to move these images along touch to the rectangle in another view. I am able to move the image along scrollview (ie, along the same view) but not able to move across another view.
Now am changing the center of image depending on touch position. When touch point increases beyond the frame of scrollview the image disappears. This is my problem
- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView: self];
NSLog(#"%f,%f",location.x,location.y);
touch.view.center = location;
}
Any solution to this problem will be a great help for me !!!
Please refer image for further details
Here is what I'd do :
Add a panGestureRecognizer to each image, with the following handlePan: method as its action. You still have to figure out how to get the correct imageView (myImageView), but this will make your image follow your finger.
- (IBAction)handlePan:(UIPanGestureRecognizer *)recognizer {
// Find the correct image you're dragging
// UIImageView *myImageview = ...
CGPoint translation = [recognizer translationInView:self.view];
if (recognizer.state == UIGestureRecognizerStateEnded) {
// What to do when you start the gesture
// You may also define myImageView here
// (if so, make sure you put it in #interface,
// because this method will be called multiple times,
// but you will enter this "if" only when you start the touch)
}
// Keep your image in the screen
if (myImageView.frame.origin.x + translation.x >= 0.0f &&
myImageView.frame.origin.x + myImageView.frame.size.width + translation.x <= 320.0f &&
myImageView.frame.origin.y + translation.y >= 0.0f &&
myImageView.frame.origin.y + myImageView.frame.size.height + translation.y <= 480.0f) {
myImageView.center = CGPointMake(myImageView.center.x + translation.x,
myImageView.center.y + translation.y);
}
if (recognizer.state == UIGestureRecognizerStateEnded) {
// What to do when you remove your finger from the screen
}
[recognizer setTranslation:CGPointMake(0, 0) inView:self.view];
}
In my iPhone App I want to implemented functionality as shown below
user can pick a shape(an image) from one view and put in other view
How can I achieve this?
Easiest way is to use a UIPanGestureRecognizer. That will give you messages when the view is moved and when it is dropped. When it is moved, update its center. When it is dropped, check if its position is within the bounds of the view you want to drop in. (You might need to convert coordinates to the target view's coordinate system.) If it is, do the appropriate action.
Try below link drag and drop image around the screen
also try this
You can refer to the previous post which will definitely help you to achieve this functionality...
Basic Drag and Drop in iOS
Building drag and drop interface on iphone
iPhone drag/drop
For all of above link, You have to keep in mind that You need to first get TouchesBegin event for any Control and then you have to get the TouchesMoved event for same control.
In TouchesMoved event, you just have to get the center point (CGPoint) of the Control. And when you release the control will be set at that CGPoint. If this creates problem then you can take that CGPoint in variable and set that Point in TouchesEnded event.
For your case, i think you must have to maintain the Hierarchy of the Views...Else while dragging you view may not be visible...
FOR MORE CODING PART :
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
NSLog(#"%f,%f", self.center.x, self.center.y);
CGPoint newLoc = CGPointZero;
newLoc = [self.mainView convertPoint:[[touches anyObject] locationInView:self.superview] toView:self.superview];
float newX = newLoc.x + self.superview.frame.origin.x + (self.frame.size.width /2) + [[touches anyObject] locationInView:self].x ;
float newY = newLoc.y - (((UIScrollView *)self.superview).contentOffset.y *2) ;
NSLog(#"content offset %f", ((UIScrollView *)self.superview).contentOffset.y);
self.scrollParent.scrollEnabled = NO;
NSLog(#"%f,%f", self.center.x, self.center.y);
newLoc = CGPointMake(newX, newY);
[self.superview touchesCancelled:touches withEvent:event];
[self removeFromSuperview];
NSLog(#"%f,%f", self.center.x, self.center.y);
self.center = CGPointMake(newLoc.x, newLoc.y);
[self.mainView addSubview:self];
NSLog(#"%f,%f", self.center.x, self.center.y);
[self.mainView bringSubviewToFront:self];
isInScrollview = NO;
}
-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
[UIView beginAnimations:#"stalk" context:nil];
[UIView setAnimationDuration:.001];
[UIView setAnimationBeginsFromCurrentState:YES];
UITouch *touch = [touches anyObject];
self.center = [touch locationInView: self.superview];
[UIView commitAnimations];
if ((self.center.x + (self.frame.size.width / 2)) > 150 && hasExitedDrawer && !self.scrollParent.dragging ) {
self.scrollParent.scrollEnabled = NO;
[self.delegate moveItemsDownFromIndex: ((self.center.y + (self.scrollParent.contentOffset.y)) / 44) + 1 ];
//NSLog(#"%i", ((self.center.y + (self.scrollParent.contentOffset.y *2)) / 44) + 1);
}
if (self.center.x + (self.frame.size.width / 2) < 150) {
hasExitedDrawer = YES;
}
}
-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
if ((self.center.x + (self.frame.size.width / 2)) > 150 && hasExitedDrawer && !self.scrollParent.dragging ) {
CGPoint newLoc = CGPointZero;
newLoc = [self.scrollParent convertPoint:[[touches anyObject] locationInView:self.superview] toView:self.superview];
float newY = newLoc.y + (self.scrollParent.contentOffset.y *2);
[self.scrollParent insertSubview:self atIndex:((self.center.y + (self.scrollParent.contentOffset.y)) / 44) ];
self.frame = CGRectMake(0, newY, self.frame.size.width, self.frame.size.height);
isInScrollview = YES;
hasExitedDrawer = NO;
}
}
This code may cantains some irrelevant but gives you more idea...
You can use below open source libraries:
Library 1 OBDragDrop
Library 2 AJWDraggableDroppable
Library 3 iOS-DragAndDrop
Library 4 ios-drag-and-drop
Adding drag and drop component to iOS app the Question
i thing you are going to Build a feature like Add to cart in Most of the Shopping Apps like Amazon, Flip kart and etc..
Three step solution
1) u'll have to implement/listen for touch events
2) implement dragging and touch events
3) and then manage movetosuperview method.
I am attempting to make a UIView/UIControl that people can drag up and reveal a text box, and then drag down to hide it. However, I have yet to find a method to make this "fluid" - it always seems to stop at random places and doesn't allow any more movement. At the moment I am using a UIView for the top part of the view and here is the current code:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
if ([touch view] == topMenuView) {
CGPoint location = [touch locationInView:self.superview];
CGPoint locationInsideBox = [touch locationInView:self];
CGPoint newLocation = location;
newLocation.x = self.center.x;
newLocation.y = newLocation.y + (self.frame.size.height - locationInsideBox.y) / 2;
if ((self.superview.frame.size.height - newLocation.y) < (self.frame.size.height / 2) && (self.superview.frame.size.height - newLocation.y) > -32)
{
self.center = newLocation;
}
return;
}
}
Any help would be much appreciated!
I would use a pan gesture recognizer. The following code will simply move the view up and down along with the user's finger. If you want to limit how far up it moves, have it snap to place or have momentum you'll need to add to it.
UIView * view; // The view you're moving
CGRect originalFrame; // The frame of the view when the touch began
- (void) pan:(UIPanGestureRecognizer *)pan {
switch (pan.state) {
case UIGestureRecognizerStateBegan: {
originalFrame = view.frame;
} break;
case UIGestureRecognizerStateChanged:
case UIGestureRecognizerStateEnded: {
CGPoint translation = [pan translationInView:view];
CGRect frame = originalFrame;
frame.origin.y += translation.y;
view.frame = frame;
} break;
}
}
Removing this line may well help you:
newLocation.y = newLocation.y + (self.frame.size.height - locationInsideBox.y) / 2;
What you're trying to accomplish is really nothing more than a scrollable view, so I would recommend using a UIScrollView.
Put your UIView in a UIScrollView with transparent background, and place the UIScrollView on top of your textbox. Set the correct contentSize and you're good to go.
use a uiview animation block to update the frame of the sliding view corresponding with the touch point recieved. set the animation blocks duration to something really short like .01 or lower.
I'd recommend splitting the issue in two:
Implement the view which has the text box at the bottom - You will just have to implement your own custom view/view controller.
Add your view as a subview of a UIScrollView.
This is a good tutorial which demonstrates proper initialization of UIScrollView and embedding content in it.
Custom views/controllers are a bit of a broader subject :)
Could someone please tell me how to make an image appear when the user taps the screen and make it appear at the position of the tap.
Thanks in advance,
Tate
UIView is a subclass of UIResponder, which has the following methods that might help: -touchesBegan:withEvent:, -touchesEnded:withEvent:, -touchesCancelled:withEvent: and -touchesMoved:withEvent:.
The first parameter of each of those is an NSSet of UITouch objects. UITouch has a -locationInView: instance method which should yield the position of the tap in your view.
You could create an initial star and just move it every time view is touched.
I'm not sure what you're end result will look like.
Note:
This code will give you 1 star that moves with a tap
Here is my code:-
(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
NSSet *allTouches = [event allTouches];
switch ([allTouches count]) {
case 1:
{
UITouch *touch = [[allTouches allObjects] objectAtIndex:0];
CGPoint point = [touch locationInView:myView];
myStar.center = point;
break;
}
default:
break;
}
}
It seems implied from the question that you want the user to be able to tap anywhere on the screen and have an image drawn where they tap? As opposed to tapping in a designated place and having the image appear there?
If so, you're probably going to have to go with a custom view. In that case, you'd do something like the following:
Create a subclass of UIView.
Override the touchesBegan method. Call [[touches anyObject] locationInView:self] (where touches is the first argument to the method, an NSSet of UITouch objects) to get the location of the touch, and record it.
Override the touchesEnded method. Determine the location touches ended at using the same method as in step 2.
If the second location is near the first, you'll want to place your image at that location. Record that location and call [self setNeedsDisplay] to cause the custom view to be redrawn.
Override the drawRect method. Here, if the location has been set in step 4, you can use the UIImage method drawAtPoint to draw your image at the selected location.
For further details, this link might be worth a look. Hope that helps!
EDIT: I've notice you've asked essentially the same question before. If you're not happy with the answers given there, it's generally considered better to "bump" the old one, perhaps by editing it to ask for further clarification, rather than create a new question.
EDIT: As requested, some very brief sample code follows. This is probably not the best code around, and I haven't tested it, so it may be a little iffy. Just for clarification, the THRESHOLD allows the user to move their finger a little while tapping (up to 3px), because it's very difficult to tap without moving your finger a little.
MyView.h
#define THRESHOLD 3*3
#interface MyView : UIView
{
CGPoint touchPoint;
CGPoint drawPoint;
UIImage theImage;
}
#end
MyView.m
#implementation MyView
- (id) initWithFrame:(CGRect) newFrame
{
if (self = [super initWithFrame:newFrame])
{
touchPoint = CGPointZero;
drawPoint = CGPointMake(-1, -1);
theImage = [[UIImage imageNamed:#"myImage.png"] retain];
}
return self;
}
- (void) dealloc
{
[theImage release];
[super dealloc];
}
- (void) drawRect:(CGRect) rect
{
if (drawPoint.x > -1 && drawPoint.y > -1)
[theImage drawAtPoint:drawPoint];
}
- (void) touchesBegan:(NSSet*) touches withEvent:(UIEvent*) event
{
touchPoint = [[touches anyObject] locationInView:self];
}
- (void) touchesEnded:(NSSet*) touches withEvent:(UIEvent*) event
{
CGPoint point = [[touches anyObject] locationInView:self];
CGFloat dx = point.x - touchPoint.x, dy = point.y - touchPoint.y;
if (dx + dy < THRESHOLD)
{
drawPoint = point;
[self setNeedsDisplay];
}
}
#end
Could someone please tell me how to make an image appear when the user taps the screen and make it appear at the position of the tap.
Thanks in advance,
Tate
UIView is a subclass of UIResponder, which has the following methods that might help: -touchesBegan:withEvent:, -touchesEnded:withEvent:, -touchesCancelled:withEvent: and -touchesMoved:withEvent:.
The first parameter of each of those is an NSSet of UITouch objects. UITouch has a -locationInView: instance method which should yield the position of the tap in your view.
You could create an initial star and just move it every time view is touched.
I'm not sure what you're end result will look like.
Note:
This code will give you 1 star that moves with a tap
Here is my code:-
(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
NSSet *allTouches = [event allTouches];
switch ([allTouches count]) {
case 1:
{
UITouch *touch = [[allTouches allObjects] objectAtIndex:0];
CGPoint point = [touch locationInView:myView];
myStar.center = point;
break;
}
default:
break;
}
}
It seems implied from the question that you want the user to be able to tap anywhere on the screen and have an image drawn where they tap? As opposed to tapping in a designated place and having the image appear there?
If so, you're probably going to have to go with a custom view. In that case, you'd do something like the following:
Create a subclass of UIView.
Override the touchesBegan method. Call [[touches anyObject] locationInView:self] (where touches is the first argument to the method, an NSSet of UITouch objects) to get the location of the touch, and record it.
Override the touchesEnded method. Determine the location touches ended at using the same method as in step 2.
If the second location is near the first, you'll want to place your image at that location. Record that location and call [self setNeedsDisplay] to cause the custom view to be redrawn.
Override the drawRect method. Here, if the location has been set in step 4, you can use the UIImage method drawAtPoint to draw your image at the selected location.
For further details, this link might be worth a look. Hope that helps!
EDIT: I've notice you've asked essentially the same question before. If you're not happy with the answers given there, it's generally considered better to "bump" the old one, perhaps by editing it to ask for further clarification, rather than create a new question.
EDIT: As requested, some very brief sample code follows. This is probably not the best code around, and I haven't tested it, so it may be a little iffy. Just for clarification, the THRESHOLD allows the user to move their finger a little while tapping (up to 3px), because it's very difficult to tap without moving your finger a little.
MyView.h
#define THRESHOLD 3*3
#interface MyView : UIView
{
CGPoint touchPoint;
CGPoint drawPoint;
UIImage theImage;
}
#end
MyView.m
#implementation MyView
- (id) initWithFrame:(CGRect) newFrame
{
if (self = [super initWithFrame:newFrame])
{
touchPoint = CGPointZero;
drawPoint = CGPointMake(-1, -1);
theImage = [[UIImage imageNamed:#"myImage.png"] retain];
}
return self;
}
- (void) dealloc
{
[theImage release];
[super dealloc];
}
- (void) drawRect:(CGRect) rect
{
if (drawPoint.x > -1 && drawPoint.y > -1)
[theImage drawAtPoint:drawPoint];
}
- (void) touchesBegan:(NSSet*) touches withEvent:(UIEvent*) event
{
touchPoint = [[touches anyObject] locationInView:self];
}
- (void) touchesEnded:(NSSet*) touches withEvent:(UIEvent*) event
{
CGPoint point = [[touches anyObject] locationInView:self];
CGFloat dx = point.x - touchPoint.x, dy = point.y - touchPoint.y;
if (dx + dy < THRESHOLD)
{
drawPoint = point;
[self setNeedsDisplay];
}
}
#end