My goal is very simple: retrieve title of default item at first run so I don't need to move scrollview to listen to delegate - (void)pickerView:(AKPickerView *)pickerView didSelectItem:(NSInteger)item.

When I set the highlightedFont property with a larger font than the normal font property, the first item loaded has a larger font, but it remains that way no matter what item is selected thereafter. Please fix. Ideally, the font size would gradually increase in transitioning to the larger size, rather than abruptly changing to the larger size upon selection (and vice versa for deselection). Thanks for a great job on this!

Is it possible to have, say, 5 values on infinite scroll, so that there would be no left or right end? Much how date pickers on iOS, when the month passes December it just starts right up again in January?

Awesome work! However, would there be any intention on having a swift version of the library?

At first, I thank you for providing such a control, it really saved us a lot of time.

I have a memory Issue related to AKPickerView, though not very sure, if its related.
I have a custom UITableViewCell designed in StoryBoard, which contains "AKPickerView".
When the controller gets dealloc, the tableview gets dealloc'ed, and eventually all of its subview must get dealloc'ed, but the cells hang around and aren't dealloc'ed.
Inspecting with Instruments, i see a lot of AKCollectionViewCell's hanging around.

As said above, am not very sure, if the issue is just because of AKPickerView.
It would be great, if i get some help on it.

Thanks!

Would like to see a

• (UIView *)pickerView:(AKPickerView *)pickerView viewForItem:(NSInteger)item;

delegate method.

Hello and thanks for the great code.
Is there any way to use this in a tableview in a settings style view?
each row that consists of this control should have each own datasource,values.

again thanks for contributing

It crashes on line #188 when number of items in datasource array is 0.

NSAssert(item < [self.collectionView numberOfItemsInSection:0],
         @"item out of range; '%lu' passed, but the maximum is '%lu'", item, [self.collectionView numberOfItemsInSection:0]);

I want to create a horizontal UIPicker in my phonegap application and was wondering if I can embed this control in one of the screens.

I use UIScrollViewDelegate protocol and try this:

func scrollViewDidScroll(scrollView: UIScrollView) {
    self.pickerView.backgroundColor = UIColor.whiteColor()
}
func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
    self.pickerView.backgroundColor = UIColor.clearColor()
}

but it's not work because scrollViewDidEndDecelerationg method will call when scroll end but AKPickerView will scroll automatic to title and call scrollViewDidScroll again.
How do I solve this ?

Thank you

@akkyie I'm currently using your picker in an app with a flat design and I was looking around to see if there was an easy place to add a property on AKPickerView to disable the 3D effect. I was thinking of adding a AKPickerViewStyle property with AKPickerViewStyle3D and AKPickerViewStyleFlat possible values. Or if you have a better solution? Thanks

Hello! I have installed your code and really like the design and functionality. Nice work! However, I have discovered that the delegate code crashes with an EXC_BAD_ACCESS fault if the AKPickerView object is released inside the -pickerView:didSelectItem: delegate method. This can be resolved by adding the following code to the AKPickerView implementation:

- (void)dealloc
{
    self.collectionView.delegate = nil;
}

[self.pickerMinutes selectItem:minutes animated:YES];

not matter what number i'm trying to set - crash in any case.

This throws a warning for modifying these attributes without copying. If you throw a copy in this line, it goes away.

 UICollectionViewLayoutAttributes *attributes = [[super layoutAttributesForItemAtIndexPath:indexPath] copy];

One useful addition might be for enabling support of items that are NSStrings or UIImages similar to what is allowed with UISegmentControl. UISegmentControl supports setting an image or a title (not both) for each segment using the following interface:

- (void)setTitle:(NSString *)title forSegmentAtIndex:(NSUInteger)segment;
- (void)setImage:(UIImage *)image forSegmentAtIndex:(NSUInteger)segment;

I haven't given much thought on how to implement this yet other than possibly adding a new AKPickerViewDelegate method:

- (UIImage *)pickerView:(AKPickerView *)pickerView imageForItem:(NSInteger)item;

And adding an image property to AKCollectionViewCell:

@property (nonatomic, strong) UILabel *image;

And a mode flag (specified at creation?) indicating which delegate method should be called and which collection view cell property will be populated.

I'm not crazy about the idea of a mode flag so maybe this isn't the best approach to adding this functionality.

An alternative idea would be to allow for optional setting both a title and image depending on if either or both delegate methods are implemented. In this way, the mode flag would not be necessary and the cell could do something like place the label above the image. This approach is probably a better solution.

As above. Since it defaults to 0, how can i make it change to other index? It can either animate to my index on load, or immediately show it there.

AKPickerView outputs this when running on iOS9, xCode7:

Logging only once for UICollectionViewFlowLayout cache mismatched frame
UICollectionViewFlowLayout has cached frame mismatch for index path <NSIndexPath: 0xc000000000000016> {length = 2, path = 0 - 0} - cached value: {{170.66667847961008, 0}, {72.999976338098122, 736}}; expected value: {{170.66666666666666, 0}, {73, 736}}
This is likely occurring because the flow layout subclass AKCollectionViewLayout is modifying attributes returned by UICollectionViewFlowLayout without copying them

It would be great if in image-mode the active element image would be also highlighted like it is for labels.

Hello! First of all I want to thank you for such a great work!

Now I have a small problem I cant figure out. I copied the example ViewController to my project, created a new view and etc. Everything works fine except two things:

1. I always get the errors in NSLog (from didSelectItem: method):
   2014-12-23 20:58:29.569 XXX[21526:807229] the behavior of the UICollectionViewFlowLayout is not defined because:
   2014-12-23 20:58:29.569 XXXX[21526:807229] the item height must be less than the height of the UICollectionView minus the section insets top and bottom values.
   2014-12-23 20:58:29.570 XXXXX[21526:807229] Please check the values return by the delegate.

2. The last item in the created view is always below the others...(see screenshot below)
   

What can be possibly be wrong? I cant figure it put for already two days))

with comments

It seems like there is no way to make the width for each segment/item equal?

I'm using this inside a UIView with auto layout. The picker itself works with auto layout fine, but the collection view it's using holds the initialized empty frame. Can you add constraints to the collection view to work with auto layout?

Thanks for AKPicerView first

And I need AKPickerView support loop now,but I could't modify,please help me.

Thanks very much again.

I have numbers from 50 to 200.
I want to auto scroll to 100 when PickerView can be seen.

I used to [self.pickerView scrollToItem:100 animated:NO] after [self.pickerView reloadData]
But it can't working.

Is there a way to solve this problem?
Thank you!

When we add more more objects as items say like this

self.titles = [NSMutableArray new];
for(int i =0 ; i<1000;i++){

    [self.titles addObject:[NSString stringWithFormat:@"Object %d",i]];
}
[self.pickerView reloadData];

The picker view is very slow to respond and very high cpu while scrolling ....
Any clue?

With the current implementation, the interactive region of the picker view is limited to the height of labels contained in the picker view (and these labels are sized to fit the specified titles). This can make it difficult to interact with the picker view in some cases, in particular for smaller fonts.

To observe this issue, the sample picker view app can be modified as follows:

diff --git a/AKPickerViewSample/AKViewController.m
--- a/AKPickerViewSample/AKViewController.m
+++ b/AKPickerViewSample/AKViewController.m
@@ -21,7 +21,8 @@

 {
     [super viewDidLoad];

-       self.pickerView = [[AKPickerView alloc] initWithFrame:self.view.bounds];
+       self.pickerView = [[AKPickerView alloc] initWithFrame:CGRectInset(self.view.bounds, 0, self.view.bounds.size.height/ 2.5)];
+       self.pickerView.backgroundColor = [UIColor redColor];

To address this issue, one solution would be to modify the interactive region to be the full height of the picker view. After making the change, the picker view background will be red but interaction will be limited only to the region of the screen containing the labels.

When the orientation of the device is changing, AKPickerView gives a crash. I tried and could reproduce several times.

Hi,
I'm trying to use your interesting picker.
I imported it in my project using cocoapods but it's not working. The picker simply isn't showing up...
But if I use classes included in the sample project, than it magically works without any other modification of my code.
BTW, my code is exactly equal to yours, I did a "Hello world" app trying to understand why it isn't working.
It seems that initialization (font, text color, ...) now is mandatory.

There is also an issue in collectionView:layout:insetForSectionAtIndex:
if the collectionView has no elements, the app crashes in this line of code (due to lack of check on number!=0)

CGSize firstSize = [self collectionView:collectionView layout:collectionViewLayout sizeForItemAtIndexPath:firstIndexPath];

When repeated pressure on the edge of the view turns writing color within the view to the highlightedTextColor

{

self.viewHeightPicker.delegate = self;
self.viewHeightPicker.dataSource = self;
self.viewHeightPicker.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
self.viewHeightPicker.font = [UIFont fontWithName:@"HelveticaNeue-Light" size:14];
self.viewHeightPicker.highlightedFont = [UIFont fontWithName:@"HelveticaNeue" size:14];
self.viewHeightPicker.highlightedTextColor = [UIColor colorWithRed:1 green:0.41 blue:0.18 alpha:1];
self.viewHeightPicker.textColor = [UIColor darkGrayColor];
self.viewHeightPicker.interitemSpacing = 20.0;
self.viewHeightPicker.fisheyeFactor = 0.0005;
self.viewHeightPicker.pickerViewStyle = AKPickerViewStyle3D;

}

scrollToItem method not working.
Can you help ?

hey I also have a display issue for my pickerView (all the code I put in the other issue is the same)

as you can see the first item is correctly positionned, but the other one is lower and I don't understand why

As above.

HI AK,

do you think if is possible to have a stateless picker?

As in i would like the selected item to be momentary initially?

If there are two AKPickerView in one viewControler, How to set the title for each item?

Can anybody tell me how to resolve it?

Thanks a lot !!

Hi,
I've been checking your framework out to use it in a project of mine.
I would like to build something similar to this print:

I was wondering if there is a way to customise the label or the picker view itself in order to have a two line title. It would be a title and a subtitle.
Thank you for the attention.

cocoapods still install version 2.0.0

Bug where at init the first item stays selected. (workaround, programmatically setting the the first item after init)

Awesome project for starters.

I have this embedded in a table view cell. Everything is implemented, however, I'm stuck on how the selection gets saved.

More insight on my project:
I have a left table view with multiple selections. One of which is a settings view. The settings view is a table view. In one of the cells is this project. I'm using this to give the user a selection of animations they want to use throughout the app. Zoom Out, Drop In, or the default Push navigation controller.

In the cellForRowAtIndexPath:

                //Animation Picker
                self.pickerView = [[AKPickerView alloc] initWithFrame:cell.bounds];
                self.pickerView.delegate = self;
                self.pickerView.dataSource = self;
                self.pickerView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
                [cell addSubview:self.pickerView];

                self.pickerView.font = [UIFont fontWithName:@"HelveticaNeue-Light" size:20];
                self.pickerView.highlightedFont = [UIFont fontWithName:@"HelveticaNeue" size:20];
                self.pickerView.interitemSpacing = 25.0;
                self.pickerView.fisheyeFactor = 0.0002;
                self.pickerView.pickerViewStyle = AKPickerViewStyle3D;

                zoom = @"Zoom Out";
                drop = @"Drop In";
                push = @"Push";

                self.titles = @[zoom, drop, push];

                [self.pickerView reloadData];

Then those get called in your didSelectItem below:

//Selection
pickerView:(AKPickerView *)pickerView didSelectItem:(NSInteger)item {
if ([self.titles isEqual:zoom]) {
}
else if ([self.titles isEqual:drop]) {
}
else if ([self.titles isEqual:push]) {
}
NSLog(@"%@", self.titles[item]);
}

Each one of those I plan on putting in some NSUserDefaults, so they correspond to the correct animation chosen.

The issue at hand is when leaving then returning to the settings view, it gets reset to the first item.

I've never used something like this before and I feel it's something simple I'm missing, any insight or help would be appreciated.

Hey there!

This is a great looking plugin! Can't use though due to a bug I've found. Wondering if this is known?

Basically take the demo app and run on iPhone 5 or 6 with iOS 8.2. Swipe to left or right-most item. Stop. Attempt to swipe past that last item on the list and the list will redraw and reanimate from its original position. Attempt to swipe back towards the rest of the list and the same thing will happen.

Moving the list slowly seems to be okay but it has to be very slow.

Only happens on end items.

Changing number of items doesn't help.

Only tried with text (not icons).

Am I missing something here? Would love to use this!

Let me know how I can help if possible!

Best,
C

I've got an AKPickerView which changes depending on user settings. It is in a recipe conversion tool and displays cups, grams (g) or ounces (oz) depending user settings. If user selects different units, then I change the data source array for the picker.

Changing the array works fine, and the correct list of items appears according to the unit (cup/g/oz) selected by user.

But it seems that the spacing between items is dictated by the array first loaded. If I change the array, then the new items are displayed, but the spacing is wrong and the selected item gets forced off centre (at least, I think that's why it is not centered).

Looks fine on first display:

But after changing data in that picker, it goes a bit wonky:

I can work around it by using items with very similar character lengths in each data set, but is there a way to force the picker to take into account the length of the items in the new data so that items are spaced out correctly? Any help much appreciated, thank you so much!

Hello,
Thanks for your great library!

I would like for it to sort of scroll/snap one cell at a time when scrolling side to side.
When I scroll, the position is after 2 or 3 or more items. I want property like pageenabled so would like it to work like apple camera. (Apple camera move only one cell at a time)

When I tried with pageenable property and targetContentOffsetForProposedContentOffset:withScrollingVelocity of UICollectionViewFlowLayout, I have lots of problems. Can you make more enhancement for me?

Thanks for your great library again!
Thanks,

Loannis

Hi!
I really like your picker but I can't get the picker to show if I modify the example code by setting the size of the picker to:
self.pickerView = [[AKPickerView alloc] initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, 60)];
and embed in a navigation controller running iOS 8 in the simulator, works fine in iOS 7 though or without the nav controller.

AKPickerView doesn't work after adding a collectionview to viewController

I’m new to iOS coding, and I'm struggling to get two different AKPickerViews to display at the same time. Any help would be really appreciated!

I’ve tried this:

- (void)viewDidLoad {

[super viewDidLoad];
self.picker1 = [[AKPickerView alloc] initWithFrame:CGRectMake(150, 100, 150, 50)];
self.picker1.delegate = self;
self.picker1.dataSource = self;

// rest of the picker1 settings here

self.titles1 = @[@"4",
                         @"5",
                         @"6",
                         @"7",
                         @"8"];

[self.picker1 reloadData];

self.picker2 = [[AKPickerView alloc] initWithFrame:CGRectMake(150, 300, 150, 50)];
self.picker2.delegate = self;
self.picker2.dataSource = self;

 // rest of the picker2 settings here 

self.titles2 = @[@"a",
                         @"b",
                         @"c",
                         @"d",
                         @"e"];

 [self.picker2 reloadData];

 }

But when I come to implement the numberOfItemsInPickerView and titleForItem methods I have to use one array or the other (titles1 or titles2) to get it to work. So I can get two pickers to display but both have the same data.

I guess I don't know how to implement those methods where there are two pickers:

- (NSString *)pickerView:(AKPickerView *)pickerView titleForItem:(NSInteger)item
{
return self.<<what do I put here so that picker uses data from the relevant array?>>[item];
 }

Can someone guide me towards how I can display two pickers at the same time, each independent of the other? How do I get the picker to use data from the 'correct' array?

Hello,

I'm using AKPicker view in my app, and the didselect method gets called 4 times when my view appears, I have created a method to init the picker view where I set all its properties, then I added reloadata and added it to my view.

My problem is that I want to scroll a page view controller (views inside are collection view) depending on which item is selected in the pickerView, but it gets called too many times on appearance, thus creating a loop in my app.

can you help?

thanks

Ok, so I just realized that the 2.0 that I upgraded to last week was just returning an empty AKPickerView (I had a pretty simple implementation via storyboards). I've downgraded to 1.3 and its working fine again. Just curious if this issue has been fixed (I'm not sure exactly what the error even is) in 2.1 or 2.2?

Is anyone working on this ?

Like the title says. It would be useful to copy Android's scrolling tabs functionality. Issue #47 would also be able to fix this but might take more time to implement.

Can you please take a look at this if you can find the time?