I am using the EGORefreshTableHeaderView [1] to fetch new data from a server into a UITableView.
This works pretty good but in iOS 5.1 the EGORefreshTableHeaderView does not scroll back into the intended height when the user releases the pull down. Normally it should scroll back to an contentInset of 60px. Then the loading view should be visible for the time which the loading process takes and after that scroll back to 0px inset.
The first scroll-back should happen in the egoRefreshScrollViewDidEndDragging:scrollView method.
- (void)egoRefreshScrollViewDidEndDragging:(UIScrollView *)scrollView {
BOOL _loading = NO;
if ([_delegate respondsToSelector:#selector(egoRefreshTableHeaderDataSourceIsLoading:)]) {
_loading = [_delegate egoRefreshTableHeaderDataSourceIsLoading:self];
}
if (scrollView.contentOffset.y <= - 65.0f && !_loading) {
if ([_delegate respondsToSelector:#selector(egoRefreshTableHeaderDidTriggerRefresh:)]) {
[_delegate egoRefreshTableHeaderDidTriggerRefresh:self];
}
[self setState:EGOOPullRefreshLoading];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.2];
scrollView.contentInset = UIEdgeInsetsMake(60.0f, 0.0f, 0.0f, 0.0f);
[UIView commitAnimations];
//I've also tried it with block animations! But doesn't work!
/*[UIView animateWithDuration:0.2 animations:^{
scrollView.contentInset = UIEdgeInsetsMake(60.0f, 0.0f, 0.0f, 0.0f);
}];*/
}
}
The problem is that when a user releases the scroll view on the half of the screen (shown in the screenshot below), the scrollview does not bounce back into the 60px inset where it should reload the data.
My first idea was that it is because of the animations. So I changed it to block animations but nothing changes. I guess the problem is that the animations are not executed on commitAnimations rather at the end of the loading.
Does anyone have a solution for this?
[1]... https://github.com/enormego/EGOTableViewPullRefresh
I would pull up their demo application and follow their delegate methods.
put this inside didEndDragging:
[_delegate egoRefreshScrollViewDidEndDragging:scrollView];
Related
My application has VOIP calling. In that I want to implement animation like iPhone's default Phone application does when User Clicks on Call button on dial Pad and animation that is done on End call button.
I have researched alot about this but haven't find anything yet. Any help will be appreciated on this topic.
Right now I have implemented scaling animation like below:
- (void)animateFadingOut{
self.view.transform = CGAffineTransformMakeScale(1.00, 1.00);
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationDelegate:self];
[self performSelector:#selector(push) withObject:nil afterDelay:0.35];
self.view.transform = CGAffineTransformMakeScale(0.00, 0.00);
//set transformation
[UIView commitAnimations];
}
- (void)push
{
self.view.transform = CGAffineTransformMakeScale(1.00, 1.00);
// push navigation controloller
CallViewController *objCallViewController = [[CallViewController alloc] initWithNibName:#"CallViewController_iPhone" bundle:nil];
[self setHidesBottomBarWhenPushed:YES];
[self.navigationController pushViewController:objCallViewController animated:NO];
[objCallViewController release];
[self setHidesBottomBarWhenPushed:NO];
[[AppDelegate shared] setTabHidden:TRUE];
}
But It is not giving me exact animation that default Phone application has
Here is what I might try if I was trying to create animations.
CGRect movementFrame = self.view.frame;
//Make position and size changes as needed to frame
movementFrame.origin.x = 0;
[UIView animateWithDuration:0.5
delay:0.0
options:UIViewAnimationOptionCurveEaseOut
animations:^{
/*
Animation you want to commit go here
Apply movementFrame info to the frame
of the item we want to animate
*/
//If you wanted a fade
self.view.alpha = !self.view.alpha //Simply says I want the reverse.
self.view.frame = movementFrame;
//Example of what you could do.
self.view.transform =CGAffineTransformMakeScale(1.00, 1.00);
} completion:^(BOOL finished) {
//Things that could happen once the animation is finished
[self push];
}];
This has not been tested for your case. Therefore I am also not sure if it will help you, but hopefully it will. Good luck to you.
*Edit*
So I reviewed the animation on an iPhone and it appears to me to be a series of animations happening at once.
You have what I presume to be the UIActionSheet animating down.
The top section overlay sliding up its y-axis.
Then you have, which I haven't mastered yet, a split in the back view that animates its x-axis in opposite directions which cause the split.
Finally you have the new view scale up to take frame for the effect.
I can't say 100% this how they have done it, however if I was going to attempt to recreate this, I would likely start here.
Hello there so after just quickly coming up with an animation I got pretty close it could use some tweaks.
It took me three views to do a
topView, bottomView, and backView.
Also took into account the view that you would be loading in. viewToLoadIn
`-(void)animation{
CGRect topMovementFrame = self.topView.frame; //Set dummy frame to modify
CGRect bottomViewFrame = self.bottomview.frame;
topMovementFrame.origin.y = 0 - self.topView.frame.size.height; //modify frame's yAxis so that the frame sits above the screen.
bottomViewFrame.origin.y = self.view.frame.size.height; //modify frame's yAxis to the it will sit at the bottom of the screen.
[self.viewToLoadIn setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
[UIView animateWithDuration:0.5
delay:0.0
options:UIViewAnimationOptionCurveEaseOut
animations:^{
//Animation
self.topView.frame = topMovementFrame; //Commit animations
self.bottomview.frame = bottomViewFrame;
self.backView.alpha = !self.backView.alpha;
self.backView.transform = CGAffineTransformMakeScale(100, 100);
self.viewToLoadIn.transform = CGAffineTransformMakeScale(2.0, 3.0);
*MAGIC*
} completion:^(BOOL finished) {
//Completion
//Clean up your views that you are done with here.
}];
}`
So then When they pressed the button I had setup this animation would happen.
Also at first I thought that the setup might contain a UIActionStyleSheet. which it still might but this is a pretty handy built in functionality. But the fact that you can interact with the screen lead me to think a custom view. It would be easier in my opinion.
I hope this helps you even if it just a little bit.
Take care ^^
I am trying to force EGORefreshTableHeaderView to update from the code. When I pull down everything works perfect and the TableView (root) gets refreshed. But I have a modal view where the user can subscribe to certain entities. When he subscribes to one the reload method in the first (root) table view gets triggered. This method establishes a connection to a server, loads some specific data based on the subscription, stores it in a CoreData DB and updates the TableView (root).
The problem is that when the user is only connected to 3G or Edge network the download, which is processed in an own thread, can take several seconds. To indicate the user that something happens I would like to show the EGORefreshTableHeaderView.
I found out that I can set the indent of the refresh view and manually show the loading icon but I was wondering if there is not an easier solution by just triggering a delegate or a method on the EGORefreshTableHeaderView?
Did you try using egoRefreshScrollViewDataSourceStartManualLoading?
Assuming your EGORefreshTableHeaderView instance is named _refreshTableHeaderView, then a call like:
[_refreshTableHeaderView egoRefreshScrollViewDataSourceStartManualLoading:self.tableView];
works for me...
So, it's been too long since I used this, and I forgot I applied the change myself...
I modified EGORefreshTableHeaderDelegate (declared in EGORefreshTableHeaderView.h) to add this additional protocol:
- (void)egoRefreshScrollViewDataSourceStartManualLoading:(UIScrollView *)scrollView;
And the implementation (in EGORefreshTableHeaderView.m):
- (void)egoRefreshScrollViewDataSourceStartManualLoading:(UIScrollView *)scrollView {
[self setState:EGOOPullRefreshLoading];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.2];
scrollView.contentInset = UIEdgeInsetsMake(60.0f, 0.0f, 0.0f, 0.0f);
[UIView commitAnimations];
if ([_delegate respondsToSelector:#selector(egoRefreshTableHeaderDidTriggerRefresh:)]) {
[_delegate egoRefreshTableHeaderDidTriggerRefresh:self];
}
}
Let me know if you need more help there.
(And thank-you enormego for the great work!)
Thanks to Reuven and his code I have improved it a little bit that it can also be used in an UIScrollView that is larger as the screen. Additionally, I have changed the deprecated commitAnimations to block animations.
#pragma mark - Manually refresh view update
- (void)egoRefreshScrollViewDataSourceStartManualLoading:(UIScrollView *)scrollView {
[self.refreshHeaderView setState:EGOOPullRefreshLoading];
//animating pull down scroll view
[UIView animateWithDuration:0.2
animations:^{
scrollView.contentInset = UIEdgeInsetsMake(60.0f, 0.0f, 0.0f, 0.0f);
scrollView.contentOffset = CGPointMake(0, -60.0f);
}
];
//triggering refreshview regular refresh
if ([self.tableView.delegate respondsToSelector:#selector(egoRefreshTableHeaderDidTriggerRefresh:)]) {
[self egoRefreshTableHeaderDidTriggerRefresh:self.refreshHeaderView];
}
}
Is there a way to change the speed of the animation when scrolling a UITableView using setContentOffset:animated:? I want to scroll it to the top, but slowly. When I try the following, it causes the bottom few cells to disappear before the animation starts (specifically, the ones that won't be visible when the scroll is done):
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:3.0];
[self.tableView setContentOffset:CGPointMake(0, 0)];
[UIView commitAnimations];
Any other way around this problem? There is a private method _setContentOffsetAnimationDuration that works, but I don't want to be rejected from the app store.
[UIView animateWithDuration:2.0 animations:^{
scrollView.contentOffset = CGPointMake(x, y);
}];
It works.
Setting the content offset directly did not work for me. However, wrapping setContentOffset(offset, animated: false) inside an animation block did the trick.
UIView.animate(withDuration: 0.5, animations: {
self.tableView.setContentOffset(
CGPoint(x: 0, y: yOffset), animated: false)
})
I've taken nacho4d's answer and implemented the code, so I thought it would be helpful for other people coming to this question to see working code:
I added member variables to my class:
CGPoint startOffset;
CGPoint destinationOffset;
NSDate *startTime;
NSTimer *timer;
and properties:
#property (nonatomic, retain) NSDate *startTime;
#property (nonatomic, retain) NSTimer *timer;
and a timer callback:
- (void) animateScroll:(NSTimer *)timerParam
{
const NSTimeInterval duration = 0.2;
NSTimeInterval timeRunning = -[startTime timeIntervalSinceNow];
if (timeRunning >= duration)
{
[self setContentOffset:destinationOffset animated:NO];
[timer invalidate];
timer = nil;
return;
}
CGPoint offset = [self contentOffset];
offset.x = startOffset.x +
(destinationOffset.x - startOffset.x) * timeRunning / duration;
[self setContentOffset:offset animated:NO];
}
then:
- (void) doAnimatedScrollTo:(CGPoint)offset
{
self.startTime = [NSDate date];
startOffset = self.contentOffset;
destinationOffset = offset;
if (!timer)
{
self.timer = [NSTimer scheduledTimerWithTimeInterval:0.01
target:self
selector:#selector(animateScroll:)
userInfo:nil
repeats:YES];
}
}
you'd also need timer cleanup in the dealloc method. Since the timer will retain a reference to the target (self) and self has a reference to the timer, some cleanup code to cancel/destroy the timer in viewWillDisappear is likely to be a good idea too.
Any comments on the above or suggestions for improvement would be most welcome, but it is working very well with me, and solves other issues I was having with setContentOffset:animated:.
There is no a direct way of doing this, nor doing the way you wrote it. The only way I can accomplish this is by making the movement/animation by my own.
For example move 1px every 1/10 second should simulate a very slow scroll animation. (Since its a linear animation maths are very easy!)
If you want to get more realistic or fancy and simulate easy-in easy-off effect then you need some maths to calculate a bezier path so you can know the exact position at every 1/10 second, for example
At least the first approach shouldn't be that difficult.
Just use or -performSelector:withObject:afterDelay or NSTimerswith
-[UIScrollView setContentOffset:(CGPoint*)];`
Hope it helps
UIView calculates final view and then animates it. That's why cells that invisible on finish of animation invisible on start too. For prevent this needed add layoutIfNeeded in animation block:
[UIView animateWithDuration:2.0 animations:^{
[self.tableView setContentOffset:CGPointMake(0, 0)];
[self.tableView layoutIfNeeded]
}];
Swift version:
UIView.animate(withDuration: 2) {
self.tableView.contentOffset.y = 10
self.tableView.layoutIfNeeded()
}
I'm curious as to whether you found a solution to your problem. My first idea was to use an animateWithDuration:animations: call with a block setting the contentOffset:
[UIView animateWithDuration:2.0 animations:^{
scrollView.contentOffset = CGPointMake(x, y);
}];
Side effects
Although this works for simple examples, it also has very unwanted side effects. Contrary to the setContentOffset:animated: everything you do in delegate methods also gets animated, like the scrollViewDidScroll: delegate method.
I'm scrolling through a tiled scrollview with reusable tiles. This gets checked in the scrollViewDidScroll:. When they do get reused, they get a new position in the scroll view, but that gets animated, so there are tiles animating all the way through the view. Looks cool, yet utterly useless. Another unwanted side effect is that possible hit testing of the tiles and my scroll view's bounds is instantly rendered useless because the contentOffset is already at a new position as soon as the animation block executes. This makes stuff appear and disappear while they're still visible, as to where they used to be toggled just outside of the scroll view's bounds.
With setContentOffset:animated: this is all not the case. Looks like UIScrollView is not using the same technique internally.
Is there anyone with another suggestion for changing the speed/duration of the UIScrollView setContentOffset:animated: execution?
You can set the duration as follows:
scrollView.setValue(5.0, forKeyPath: "contentOffsetAnimationDuration") scrollView.setContentOffset(CGPoint(x: 100, y: 0), animated: true)
This will also allow you to get all of your regular delegate callbacks.
https://github.com/dominikhofmann/PRTween
subclass UITableview
#import "PRTween.h"
#interface JPTableView : UITableView{
PRTweenOperation *activeTweenOperation;
}
- (void) doAnimatedScrollTo:(CGPoint)destinationOffset
{
CGPoint offset = [self contentOffset];
activeTweenOperation = [PRTweenCGPointLerp lerp:self property:#"contentOffset" from:offset to:destinationOffset duration:1.5];
}
IF all your trying to do is scroll your scrollview I think you should use scroll rect to visible. I just tried out this code
[UIView animateWithDuration:.7
delay:0
options:UIViewAnimationOptionCurveEaseOut
animations:^{
CGRect scrollToFrame = CGRectMake(0, slide.frame.origin.y, slide.frame.size.width, slide.frame.size.height + kPaddingFromTop*2);
CGRect visibleFrame = CGRectMake(0, scrollView.contentOffset.y,
scrollView.frame.size.width, scrollView.frame.size.height);
if(!CGRectContainsRect(visibleFrame, slide.frame))
[self.scrollView scrollRectToVisible:scrollToFrame animated:FALSE];}];
and it scrolls the scrollview to the location i need for whatever duration i am setting it for. The key is setting animate to false. When it was set to true, the animation speed was the default value set by the method
For people who also have issues with disappearing items while scrolling a UITableView or a UICollectionView you can expand the view itself so that we hold more visible items. This solution is not recommended for situations where you need to scroll a great distance or in situations where the user can cancel the animation. In the app I'm currently working on I only needed to let the view scroll a fixed 100px.
NSInteger scrollTo = 100;
CGRect frame = self.collectionView.frame;
frame.size.height += scrollTo;
[self.collectionView setFrame:frame];
[UIView animateWithDuration:0.8 delay:0.0 options:(UIViewAnimationOptionCurveEaseIn) animations:^{
[self.collectionView setContentOffset:CGPointMake(0, scrollTo)];
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.8 delay:0.0 options:(UIViewAnimationOptionCurveEaseIn) animations:^{
[self.collectionView setContentOffset:CGPointMake(0, 0)];
} completion:^(BOOL finished) {
CGRect frame = self.collectionView.frame;
frame.size.height -= scrollTo;
[self.collectionView setFrame:frame];
}];
}];
I use transitionWithView:duration:options:animations:completion:
[UIView transitionWithView:scrollView duration:3 options:(UIViewAnimationOptionCurveLinear) animations:^{
transitionWithView:scrollView.contentOffset = CGPointMake(contentOffsetWidth, 0);
} completion:nil];
UIViewAnimationOptionCurveLinear is an option make animation to occur evenly over.
While I found that in an animation duration, the delegate method scrollViewDidScroll did not called until animation finished.
You can simply use block based animation to animate the speed of scrollview.
First calculate the offset point to which you want to scroll and then simply pass that offset value as here.....
[UIView animateWithDuration:1.2
delay:0.02
options:UIViewAnimationCurveLinear
animations:^{
[colorPaletteScrollView setContentOffset: offset ];
}
completion:^(BOOL finished)
{ NSLog(#"animate");
} ];
here colorPaletteScrollView is my custom scrollview and offset is the value passed .
this code works perfectly fine for me.
Is there a reason you're using setContentOffset and not scrollRectToVisible:animated:?
- (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated
I would recommend doing it like this:
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:3.0];
[self.tableView scrollRectToVisible:CGRectMake(0, 0, 320, 0) animated:NO];
[UIView commitAnimations];
Unless that doesnt work. I still think you should try it.
Actually TK189's answer is partially correct.
To achieve a custom duration animated contentOffset change, with proper cell reuse by UITableView and UICollectionView components, you just have to add a layoutIfNeeded call inside the animations block:
[UIView animateWithDuration:2.0 animations:^{
tableView.contentOffset = CGPointMake(x, y);
[tableView layoutIfNeeded];
}];
On Xcode 7.1 - Swift 2.0 :
func textFieldShouldEndEditing(textField: UITextField) -> Bool {
dispatch_async(dispatch_get_main_queue()) {
UIView.animateWithDuration(0, animations: { self.scrollView!.setContentOffset(CGPointZero,animated: true) })
}
return true
}
OR
func textFieldShouldReturn(textField: UITextField) -> Bool {
if(textField.returnKeyType == UIReturnKeyType.Next) {
password.becomeFirstResponder()
}
dispatch_async(dispatch_get_main_queue()) {
UIView.animateWithDuration(0, animations: { self.scrollView!.setContentOffset(CGPointZero,animated: true) })
}
textField.resignFirstResponder()
return true
}
Note: self.scrollView!.setContentOffset(CGPointZero,animated: true) can have different positions depending on the requirement
Example:
let scrollPoint:CGPoint = CGPointMake(0,textField.frame.origin.y/2);
scrollView!.setContentOffset(scrollPoint, animated: true);
I wanted to change the contentOffSet of tableview when textfield begins to edit.
Swift 3.0
func textFieldDidBeginEditing(_ textField: UITextField) {
DispatchQueue.main.async {
UIView.animate(withDuration: 0, animations: {
self.sampleTableView.contentOffset = CGPoint(x: 0, y: 0 - (self.sampleTableView.contentInset.top - 200 ))
})
}
}
I got a problem to integrate iAd in my iPhone apps -- the banner ad is fine when it expends (see http://www.clingmarks.com/iAd1.png and http://www.clingmarks.com/iAd2.png), however, when I close it, it left a white blank screen (see http://www.clingmarks.com/iAd3.png). I couldn't figure out why. Here is how I integrate the ad:
Because I need to support other ads for lower version of iPhone OSes, I add a container view at the top of the apps, whose view controller is AdViewController. When the view is loaded, I create a AdBannerView programmatically and add it as a subview to the AdViewController.view. Here is the code in the viewDidLoad method:
Class adClass = (NSClassFromString(#"ADBannerView"));
if (adClass != nil) {
iAdView = [[ADBannerView alloc] initWithFrame:CGRectZero];
iAdView.frame = CGRectOffset(iAdView.frame, 0, -50);
iAdView.requiredContentSizeIdentifiers = [NSSet setWithObject:ADBannerContentSizeIdentifier320x50];
iAdView.currentContentSizeIdentifier = ADBannerContentSizeIdentifier320x50;
iAdView.delegate = self;
iadViewIsVisible = NO;
[self.view addSubview:iAdView];
} else {
// init google adsense
}
Following are the delegate methods:
enter code here
- (void)bannerViewDidLoadAd:(ADBannerView *)banner {
if (!iadViewIsVisible) {
[UIView beginAnimations:#"animateAdBannerOn" context:NULL];
// banner is invisible now and moved out of the screen on 50 px
banner.frame = CGRectOffset(banner.frame, 0, 50);
[UIView commitAnimations];
iadViewIsVisible = YES;
}
}
- (void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error {
if (iadViewIsVisible) {
[UIView beginAnimations:#"animateAdBannerOff" context:NULL];
// banner is visible and we move it out of the screen, due to connection issue
banner.frame = CGRectOffset(banner.frame, 0, -50);
[UIView commitAnimations];
iadViewIsVisible = NO;
}
}
Eventually I figured it out myself. It turns out the ADBannerView's parent view must be a fullscreen view. I my case above, I added AdBannerView to my adView, which is a view with size 320x50. When I changed its parent view to a fullscreen view, everything works. I am not sure if this is a bug in iAd, but certainly something tricky.
When the banner finishes, it moves itself to the top of the screen even if that means having a negative y coordinate. I center the banner when it finishes. In my case there is a view controller for just the banner, so it is only full screen when the ad is clicked.
-(void) bannerViewActionDidFinish:(UIView *)inBanner {
CGRect frame = [inBanner frame];
frame.origin.x = frame.size.width * 0.5;
frame.origin.y = frame.size.height * 0.5;
[inBanner setCenter:frame.origin];
}
Hey David! I know what you mean, I'm also using an own AdvertisementViewController which calls different ad networks.
So iAd is not in a full screen view but inside a 320x50 view.
Simply do this:
-(void) bannerViewActionDidFinish:(ADBannerView *)inBanner {
[self.view setFrame:CGRectMake(0.0f, 0.0f, 320.0f, 50.0f)];
}
So the outer view container (self.view) is resized to its original size. iAd is resizing it to fullscreen for displaying the ad when an iAd is shown.
So I've got a problem with buttons and animations. Basically, I'm animating a view using the UIView animations while also trying to listen for taps on the button inside the view. The view is just as large as the button, and the view is actually a subclass of UIImageView with an image below the button. The view is a subview of a container view placed in Interface Builder with user interaction enabled and clipping enabled. All the animation and button handling is done in this UIImageView subclass, while the startFloating message is sent from a separate class as needed.
If I do no animation, the buttonTapped: message gets sent correctly, but during the animation it does not get sent. I've also tried implementing the touchesEnded method, and the same behavior occurs.
UIImageView subclass init (I have the button filled with a color so I can see the frame gets set properly, which it does):
- (id)initWithImage:(UIImage *)image {
self = [super initWithImage:image];
if (self != nil) {
// ...stuffs
UIButton *tapBtn = [UIButton buttonWithType:UIButtonTypeCustom];
tapBtn.frame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
[tapBtn addTarget:self action:#selector(buttonTapped:) forControlEvents:UIControlEventTouchUpInside];
tapBtn.backgroundColor = [UIColor cyanColor];
[self addSubview:tapBtn];
self.userInteractionEnabled = YES;
}
return self;
}
Animation method that starts the animation (if I don't call this the button works correctly):
- (void)startFloating {
[UIView beginAnimations:#"floating" context:nil];
[UIView setAnimationDelegate:self];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
[UIView setAnimationDuration:10.0f];
self.frame = CGRectMake(self.frame.origin.x, -self.frame.size.height, self.frame.size.width, self.frame.size.height);
[UIView commitAnimations];
}
So, to be clear:
Using the UIView animation effectively disables the button.
Disabling the animation causes the button to work.
The button is correctly sized and positioned on screen, and moves along with the view correctly.
This resolves the issue:
[UIView animateWithDuration:20 delay: 0.0 options: UIViewAnimationOptionCurveEaseInOut | UIViewAnimationOptionAllowUserInteraction
...
The animation is just eye candy. The animation lags behind the actual movement of the view. The button is already at the destination point when the animation starts. You just see a movie of the view/button moving.
If you want a button to be clickable during the animation, you'll have to make the animation yourself.
... was experiencing this same problem because my code was doing one large animation per block. I made an NSTimer based solution, like the one suggested above, and it worked... yet the movement was jerky (unless I inserted animation within every timer event trigger).
So, since animation was required anyway, I found a solution which requires no timer. It animates only a short distance and thus the button click is still accurate, with only a small error which is my case is very unnoticeable in the UI, and can be reduced depending on your params.
Note below that the error at any given time is < 15.0, which can be reduced for more accuracy depending on your animation speed requirements. You can also reduce the duration time for more speed.
- (void)conveyComplete:(UIView*)v
{
[self convey:v delay:0];
}
- (void)convey:(UIView*)v delay:(int)nDelay
{
[UIView animateWithDuration:.5
delay:nDelay
options:(UIViewAnimationOptionCurveLinear | UIViewAnimationOptionAllowUserInteraction)
animations: ^
{
CGRect rPos = v.frame;
rPos.origin.x -= 15.0;
v.frame = rPos;
}
completion: ^(BOOL finished)
{
[self conveyComplete:v];
}];
}