I'm having difficulties getting a tiled UIScrollView to zoom in and out correctly with pinch zooming. The issue is that when a pinch-zoom occurs, the resulting view is usually not centered in the same region.
Details: The app starts with a tiled image that is 500x500. If a user zooms in, it will snap to 1000x1000 and the tiles will redraw. For all the zoom affects, etc. I am just letting the UIScrollView do it's thing. When scrollViewDidEndZooming:withView:atScale: is called, I redraw the tiles (like you can see in many examples and other questions here).
I think that I've drilled the problem down to calculating the center of the view correctly when I get to scrollViewDidEndZooming:withView:atScale: (I can center on a known point fine after I redraw).
What I'm currently using:
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale {
// as an example, create the "target" content size
CGSize newZoomSize = CGSizeMake(1000, 1000);
// get the center point
CGPoint center = [scrollView contentOffset];
center.x += [scrollView frame].width / 2;
center.y += [scrollView frame].height / 2;
// since pinch zoom changes the contentSize of the scroll view, translate this point to
// the "target" size (from the current size)
center = [self translatePoint:center currentSize:[scrollView contentSize] newSize:newZoomSize];
// redraw...
}
/*
Translate the point from one size to another
*/
- (CGPoint)translatePoint:(CGPoint)origin currentSize:(CGSize)currentSize newSize:(CGSize)newSize {
// shortcut if they are equal
if(currentSize.width == newSize.width && currentSize.height == newSize.height){ return origin; }
// translate
origin.x = newSize.width * (origin.x / currentSize.width);
origin.y = newSize.height * (origin.y / currentSize.height);
return origin;
}
Does this seem correct? Is there a better way? Thanks!
The way I have solved this so far is to store the initial center point of the view when the zoom starts. I initially saving this value when the scrollViewDidScroll method is called (and the scroll view is zooming). When scrollViewDidEndZooming:withView:atScale: is called, I use that center point (and reset the saved value).
The center of the scrollview can be found by adding it's center property, and it's contentOffset property.
aView.center = CGPointMake(
self.scrollView.center.x + self.scrollView.contentOffset.x,
self.scrollView.center.y + self.scrollView.contentOffset.y);
Related
Hello everyone I am trying to zoom in a out a uiimageview using animation as i am scrolling down a uiscrollview. Please note its not about making a uiimageview zoom in and out in a uiscrollview.
I am able to detect how much i am scrolling down :
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
}
I need to zoom out the image depending( the scroll factor) how much i am scrolling down. Any idea how this can be done?
I suggesting changing the transform property of the image you are trying to scale
- (void)scrollViewDidScroll:(UIScrollView*)scrollView{
// this is just a demo method on how to compute the scale factor based on the current contentOffset
float scale = 1.0f + fabsf(scrollView.contentOffset.y) / scrollView.frame.size.height;
//Cap the scaling between zero and 1
scale = MAX(0.0f, scale);
// Set the scale to the imageView
imageView.transform = CGAffineTransformMakeScale(scale, scale);
}
If you also need the scrollview to go to the top one the imageview has been zoomed out, then you will need to adjust the frame of the scrollview and imageview.
Maybe you can tell us more about your desired effect.
Here's a Swift version of Andrei's answer. I am also exiting early if the user is swiping up (scrolling down), because I only wanted to show the zoom effect when they were pulling down on the table view.
// Exit early if swiping up (scrolling down)
if scrollView.contentOffset.y > 0 { return }
// this is just a demo method on how to compute the scale factor based on the current contentOffset
var scale = 1.0 + fabs(scrollView.contentOffset.y) / scrollView.frame.size.height
//Cap the scaling between zero and 1
scale = max(0.0, scale)
// Set the scale to the imageView
self.imageView.transform = CGAffineTransformMakeScale(scale, scale)
I have a UICollectionView with 6 pages, and paging enabled, and a UIPageControl. What I want is, when I came to the last page, if I drag to right, UICollectionView reloads from first page seamlessly.
- (void)scrollViewDidEndDecelerating:(UIScrollView *)sender
{
// The key is repositioning without animation
if (collectionView.contentOffset.x == 0) {
// user is scrolling to the left from image 1 to image 10.
// reposition offset to show image 10 that is on the right in the scroll view
[collectionView scrollRectToVisible:CGRectMake(collectionView.frame.size.width*(pageControl.currentPage-1),0,collectionView.frame.size.width,collectionView.frame.size.height) animated:NO];
}
else if (collectionView.contentOffset.x == 1600) {
// user is scrolling to the right from image 10 to image 1.
// reposition offset to show image 1 that is on the left in the scroll view
[collectionView scrollRectToVisible:CGRectMake(0,0,collectionView.frame.size.width,collectionView.frame.size.height) animated:NO];
}
pageControlUsed = NO;
}
It doesn't work like I want. What can I do?
Here's what I ended up with for my UICollectionView (horizontal scrolling like the UIPickerView):
#implementation UIInfiniteCollectionView
- (void) recenterIfNecessary {
CGPoint currentOffset = [self contentOffset];
CGFloat contentWidth = [self contentSize].width;
// don't just snap to center, since this might be done in the middle of a drag and not aligned. Make sure we account for that offset
CGFloat offset = kCenterOffset - currentOffset.x;
int delta = -round(offset / kCellSize);
CGFloat shift = (offset + delta * kCellSize);
offset += shift;
CGFloat distanceFromCenter = fabs(offset);
// don't always recenter, just if we get too far from the center. Eliza recommends a quarter of the content width
if (distanceFromCenter > (contentWidth / 4.0)) {
self.contentOffset = CGPointMake(kCenterOffset, currentOffset.y);
// move subviews back to make it appear to stay still
for (UIView *subview in self.subviews) {
CGPoint center = subview.center;
center.x += offset;
subview.center = center;
}
// add the offset to the index (unless offset is 0, in which case we'll assume this is the first launch and not a mid-scroll)
if (currentOffset.x > 0) {
int delta = -round(offset / kCellSize);
// MODEL UPDATE GOES HERE
}
}
}
- (void) layoutSubviews { // called at every frame of scrolling
[super layoutSubviews];
[self recenterIfNecessary];
}
#end
Hope this helps someone.
I've been using the Street Scroller sample to create an infinite scroller for images. That works fine until I wanted to set pagingEnabled = YES; Tried tweaking around the recenterIfNecessary code and finally realized that it's the contentOffset.x that has to match the frame of the subview that i want visible when paging stops. This really isn't going to work in recenterIfNecessary since you have no way of knowing it will get called from layoutSubviews. If you do get it adjusted right, the subview may pop out from under your finger. I do the adjustment in scrollViewDidEndDecelerating. So far I haven't had problems with scrolling fast. It will work and simulate paging even when pagingEnabled is NO, but it looks more natural with YES.
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
[super scrollViewDidEndDecelerating:scrollView];
CGPoint currentOffset = [self contentOffset];
// find the subview that is the closest to the currentOffset.
CGFloat closestOriginX = 999999;
UIView *closestView = nil;
for (UIView *v in self.visibleImageViews) {
CGPoint origin = [self.imageContainerView convertPoint:v.frame.origin toView:self];
CGFloat distanceToCurrentOffset = fabs(currentOffset.x - origin.x);
if (distanceToCurrentOffset <= closestOriginX) {
closestView = v;
closestOriginX = distanceToCurrentOffset;
}
}
// found the closest view, now find the correct offset
CGPoint origin = [self.imageContainerView convertPoint:closestView.frame.origin toView:self];
CGPoint center = [self.imageContainerView convertPoint:closestView.center toView:self];
CGFloat offsetX = currentOffset.x - origin.x;
// adjust the centers of the subviews
[UIView animateWithDuration:0.1 animations:^{
for (UIView *v in self.visibleImageViews) {
v.center = [self convertPoint:CGPointMake(v.center.x+offsetX, center.y) toView:self.imageContainerView];
}
}];
}
I have not used UICollectionView for infinite scrolling, but when doing it with a UIScrollView you first adjust your content offset (instead of using scrollRectToVisible) to the location you want. Then, you loop through each subview in your scroller and adjust their coordinates either to the right or left based on the direction the user was scrolling. Finally, if either end is beyond the bounds you want them to be, move them to the far other end. Their is a very good WWDC video from apple about how to do infinite scrolling you can find here: http://developer.apple.com/videos/wwdc/2012/
I have a UIScrollView and added a UIView inside it, when I zoom it, is it possible to get the CGRect of the zoomed frame in relation to the original frame?
E.g. i have 800x600 frame, then i zoomed to {{50, 60}, {100, 100}} is it possible to programmatically get the zoomed frame?
I usually use the following method (added to the custom UIScrollView category):
- (CGRect) visibleRect{
CGRect visibleRect;
visibleRect.origin = self.contentOffset;
visibleRect.size = self.bounds.size;
visibleRect.origin.x /= self.zoomScale;
visibleRect.origin.y /= self.zoomScale;
visibleRect.size.width /= self.zoomScale;
visibleRect.size.height /= self.zoomScale;
return visibleRect;
}
The problem with #Vladimir solution is that it displays visibleRect wrong if viewForZoom is smaller than ScrollView bounds. So I came up with this solution.
- (CGRect) zoomedFrame{
CGRect zoomedFrame;
zoomedFrame.origin = self.contentOffset;
zoomedFrame.origin.x -= zoomingView.frame.origin.x;
zoomedFrame.origin.y -= zoomingView.frame.origin.y;
zoomedFrame.size = self.contentSize;
return zoomedFrame;
}
zoomingView is a view that returns viewForZoomingInScrollView: method.
bounds are bounds of scrollView.
So there are two cases:
When the zoomingView is smaller than bounds, contentOffset reflect not the top-left corner of content view, but some strange shift of content view relative to the center of bounds. And zoomingView.frame.origin has normal values as if zoomingView were in the center of bounds. (this happens if you try to shrink the zoomingView more than minimulScale)
When the zoomingView is bigget than bounds, zoomingView.frame.origin has strange values like this:
{-6.15367e-06, 3.98168e-06}
And contentOffset shows what it should.
So all that compensate each other as I showed in my code.
My application has a UIScrollView with one subview. The subview is an extended UIView which prints a PDF page to itself using layers in the drawLayer event.
Zooming using the built in pinching works great. setZoomScale also works as expected.
I have been struggling with the zoomToRect function. I found an example online which makes a CGRect zoomRect variable from a given CGPoint.
In the touchesEnded function, if there was a double tap and they are all the way zoomed out, I want to zoom in to that PDFUIView I created as though they were pinching out with the center of the pinch where they double tapped.
So assume that I pass the UITouch variable to my function which utilizes zoomToRect if they double tap.
I started with the following function I found on apples site:
http://developer.apple.com/iphone/library/documentation/WindowsViews/Conceptual/UIScrollView_pg/ZoomZoom/ZoomZoom.html
The following is a modified version for my UIScrollView extended class:
- (void)zoomToCenter:(float)scale withCenter:(CGPoint)center {
CGRect zoomRect;
zoomRect.size.height = self.frame.size.height / scale;
zoomRect.size.width = self.frame.size.width / scale;
zoomRect.origin.x = center.x - (zoomRect.size.width / 2.0);
zoomRect.origin.y = center.y - (zoomRect.size.height / 2.0);
//return zoomRect;
[self zoomToRect:zoomRect animated:YES];
}
When I do this, the UIScrollView seems to zoom using the bottom right edge of the zoomRect above and not the center.
If I make UIView like this
UIView *v = [[UIView alloc] initWithFrame:zoomRect];
[v setBackgroundColor:[UIView redColor]];
[self addSubview:v];
The red box shows up with the touch point dead in the center.
Please note: I am writing this from my PC, I recall messing around with the divided by two part on my Mac, so just assume that this draws a rect with the touch point in the center. If the UIView drew off center but zoomed to the right spot it would be all good.
However, what happens is when it preforms the zoomToRect it seems to use the bottom right off the zoomRect at the top left of the zoomed in results.
Also, I noticed that depending on where I click on the UIScrollView, it anchors to diffrent spots. It almost seems like there is a cross down the middle and it's reflecting the points somehow as though anywhere left of the middle is a negative reflection and anywhere right of the middle is a positive reflection?
This seems to complicated, shouldn't it just zoom to the rect that was drawn as the UIView was able to draw?
I used a lot of research to figure out how to create a PDF that scales in high quality, so I am assuming that using the CALayer may be throwing off the coordinate system? But to the UIScrollView it should just treat it as a view with 768x985 dimensions.
This is sort of advanced, please assume the code for creating the zoomRect is all good. There is something deeper with the CALayer in the UIView which is in the UIScrollView....
Ok another answer:
The apple supplied routine works for me, but you need to have the gesture recognizer convert the tap point to the imageView coords - not to the scroller.
Apple's example does this, but since our app works differently (we change the UIImageView), so the gestureRecongnizer was set up on the uiscrollview - which works fine, but you need to do this in the handleDoubleTap:
This is loosely based on the apple example code "TaptoZoom", but as I said we needed our gesture recognizer hooked up to the scroll view.
- (void)handleDoubleTap:(UIGestureRecognizer *)gestureRecognizer {
// double tap zooms in
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:#selector(handleSingleTap:) object:nil];
float newScale = [imageScrollView zoomScale] * 1.5;
// Note we need to get location of the tap in the imageView coords, not the imageScrollView
CGRect zoomRect = [self zoomRectForScale:newScale withCenter:[gestureRecognizer locationInView:imageView]];
[imageScrollView zoomToRect:zoomRect animated:YES];
}
Declare BOOL isZoom; in .h
-(void)handleDoubleTap:(UIGestureRecognizer *)recognizer {
if(isZoom){
CGPoint Pointview=[recognizer locationInView:self];
CGFloat newZoomscal=3.0;
newZoomscal=MIN(newZoomscal, self.maximumZoomScale);
CGSize scrollViewSize=self.bounds.size;
CGFloat w=scrollViewSize.width/newZoomscal;
CGFloat h=scrollViewSize.height /newZoomscal;
CGFloat x= Pointview.x-(w/2.0);
CGFloat y = Pointview.y-(h/2.0);
CGRect rectTozoom=CGRectMake(x, y, w, h);
[self zoomToRect:rectTozoom animated:YES];
[self setZoomScale:3.0 animated:YES];
isZoom=NO;
}
else{
[self setZoomScale:1.0 animated:YES];
isZoom=YES;
}
}
I've noticed that the apple you're using doesn't zoom properly if the image is starting at a zoomScale less than 1 because the zoomRect origin is incorrect. I edited it to work correctly. Here's the code:
- (CGRect)zoomRectForScale:(float)scale withCenter:(CGPoint)center {
CGRect zoomRect;
// the zoom rect is in the content view's coordinates.
// At a zoom scale of 1.0, it would be the size of the imageScrollView's bounds.
// As the zoom scale decreases, so more content is visible, the size of the rect grows.
zoomRect.size.height = [self frame].size.height / scale;
zoomRect.size.width = [self frame].size.width / scale;
// choose an origin so as to get the right center.
zoomRect.origin.x = (center.x * (2 - self.minimumZoomScale) - (zoomRect.size.width / 2.0));
zoomRect.origin.y = (center.y * (2 - self.minimumZoomScale) - (zoomRect.size.height / 2.0));
return zoomRect;
}
The key is this part multiplying the center value by (2 - self.minimumZoomScale).
Hope this helps.
In my case it was:
zoomRect.origin.x = center.x / self.zoomScale - (zoomRect.size.width / 2.0);
zoomRect.origin.y = center.y / self.zoomScale - (zoomRect.size.height / 2.0);
extension UIScrollView {
func getRectForVisibleView() -> CGRect {
var visibleRect: CGRect = .zero
visibleRect.origin = self.contentOffset
visibleRect.size = self.bounds.size
let theScale = 1.0 / self.zoomScale
visibleRect.origin.x *= theScale
visibleRect.origin.y *= theScale
visibleRect.size.width *= theScale
visibleRect.size.height *= theScale
return visibleRect
}
func moveToRect(rect: CGRect) {
let scale = self.bounds.width / rect.width
self.zoomScale = scale
self.contentOffset = .init(x: rect.origin.x * scale, y: rect.origin.y * scale)
}
}
I had something similar and it was because I didn't adjust the center.x and center.y values by dividing them by the scale also (using center.x/scale and center.y/scale). Maybe I'm not reading your code right.
I am having the same behavior and it is quite frustrating... The rectangle being fed to the UIScrollView is perfect.. yet my view, no matter what I do anything that involves changing the zoomScale programmatically always zooms and scales to coordinate 0,0, no matter what.
I have tried just changing the zoomScale, I've tried zoomToRect, I have tried them all, and every one the minute I touch the zoomScale in code, it goes to coordinate 0,0.
I did also have to add and explicit setContentSize to the resized image in the scrollview after a zooming operation, or otherwise I cannot scroll after a zoom or pinch.
Is this a bug in 3.1.3 or what?
I have tried different solutions, but this looks the best resolution
It is really straight forward and conceptional?
CGRect frame = [[UIScreen mainScreen] applicationFrame];
scrollView.contentInset = UIEdgeInsetsMake(frame.size.height/2,
frame.size.width/2,
frame.size.height/2,
frame.size.width/2);
I disagree with one of the comments above saying that you should never multiply the center's coordinates by some factor.
Say that you are currently displaying an entire 400x400px image or PDF file in a 100x100 scroll view and want to allow the users to double the size of the content until it's 1:1.
If you double tap at point (75,75), you expect the zoomed-in rectangle to have origin 100,100 and size 100x100 within the new 200x200 content view. So the original tapping point (75,75) is now (150,150) in the new 200x200 space.
Now, after zoom action #1 has completed, if you again double tap at (75,75) inside the new 100x100 rectangle (which is the bottom-right square of the larger 200x200 rectangle), you expect the user to be shown the bottom-right 100x100 square of the larger image, which would now become zoomed to 400x400 pixels.
In order to calculate the origin of this latest 100x100 rectangle within the larger 400x400 rectangle, you would need to consider the scale and current content offset (since before this last zoom action we were displaying the bottom-right 100x100 rectangle within a 200x200 content rectangle).
So the x coordinate of the final rectangle becomes:
center.x/currentScale - (scrollView.frame.size.width/2) + scrollView.contentOffset.x/currentScale
= 75/.5 - 100/2 + 100/.5 = 150 - 50 + 200 = 300.
In this case, being a square, the calculation for the y coordinate is the same.
And we did indeed zoom in the bottom-right 100x100 rectangle, which, in the larger 400x400 content view has origin 300,300.
So here is how you would calculate the zoom rectangle's size and origin:
zoomRect.size.height = mScrollView.frame.size.height/scale;
zoomRect.size.width = mScrollView.frame.size.width/scale;
zoomRect.origin.x = center.x/currentScale - (mScrollView.frame.size.width/2) + mScrollView.contentOffset.x/currentScale;
zoomRect.origin.y = center.y/currentScale - (mScrollView.frame.size.height/2) + mScrollView.contentOffset.y/currentScale;
Hope this made sense; it's hard to explain it in writing without sketching out the various squares/rectangles.
Cheers,
Raf Colasante
When somebody does a wipe gesture to scroll the content from left to right, I would like to have a background image scrolling into the same direction, but at a different speed. Much like what these classic games did do 20 years ago (remember that, anybody????)
I accomplished this by using two UIScrollView instances. The first is where the actual content is displayed, and the second (which is behind the first in z-order) is where I have my slower-moving background. From there the top UIScrollView has a delegate attached to it that gets notified when the contentOffset changes. That delegate, in turn, programatically sets the contentOffset of the background scroller, multiplied against a constant to slow the scroll down relative to the foreground. So, for instance, you might have something like:
// Defined as part of the delegate for the foreground UIScrollView
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
UIScrollView* scroll_view(static_cast<UIScrollView*>(bkg_scroller_m.view));
CGPoint offset(scrollView.contentOffset);
offset.x = offset.x / 3;
offset.y = offset.y / 3;
// Scroll the background scroll view by some smaller offset
scroll_view.contentOffset = offset;
}
You can easily do this by implementing scroll view did scroll with a UIImageView under it...
You'll end up with something like this... with the backgroundImageView being a UIImageView added to the view before the subview... you can layer as much image views as you want without performance issues
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
float factor = scrollView.contentOffset.x / (scrollView.contentSize.width - 320);
if (factor < 0) factor = 0;
if (factor > 1) factor = 1;
CGRect frame = backgroundImageView.frame;
frame.origin.x = factor * (320 - backgroundImageView.frame.size.width);
backgroundImageView.frame = frame;
}
You can do it with CoreAnimation. You'll want to hook into the scrollViewDidEndDragging:willDecelerate: and scrollViewWillBeginDecelerating: UIScrollViewDelegate methods. Then begin an Animation on your image by changing the center position. See this SO article for more on animations.
For example you have multiple scrollviews, want them scroll difference speed. here is the modification code base on Salamatizm answer:
CGSize screenSize = [[UIScreen mainScreen] bounds].size;
float factor = scrollView.contentOffset.x / (scrollView.contentSize.width - screenSize.width);
if (factor < 0) factor = 0;
if (factor > 1) factor = 1;
CGSize parralaxSize = self.parralaxBackgroundView.contentSize;
CGPoint parallaxOffset = CGPointMake(-(factor * (screenSize.width - parralaxSize.width)), 0);
[self.parralaxBackgroundView setContentOffset:parallaxOffset animated:NO];