A simple yet customizable horizontal picker view.

Works on iOS 6, 7 and 8.

News: Say Good-Bye to Bridging-Header! The Swift version is here.

Installation

…or simply add AKPickerView.h/m into your project.

Usage

Caveat: From version 2.0, dataSource separated from delegate. When you updated it, check new how to use below.

1. Instantiate and set delegate and dataSource as you know,

   self.pickerView = [[AKPickerView alloc] initWithFrame:<#frame#>];
   self.pickerView.delegate = self;
   self.pickerView.dataSource = self;

2. then specify the number of items using AKPickerViewDataSource methods,

   - (NSUInteger)numberOfItemsInPickerView:(AKPickerView *)pickerView;

3. and specify contents to be shown. You can use either texts or images:

   - (NSString *)pickerView:(AKPickerView *)pickerView titleForItem:(NSInteger)item;
   // OR
   - (UIImage *)pickerView:(AKPickerView *)pickerView imageForItem:(NSInteger)item;

   • Using both texts and images are currently not supported. When you implement both, -pickerView:titleForItem will be called and the other won't.
   • You currently cannot specify image sizes; AKPickerView shows the original image in its original size. Resize your images in advance if you need.

4. You can change its appearance with properties below.

   @property (nonatomic, strong) UIFont *font;
   @property (nonatomic, strong) UIFont *highlightedFont;
   @property (nonatomic, strong) UIColor *textColor;
   @property (nonatomic, strong) UIColor *highlightedTextColor;
   @property (nonatomic, assign) CGFloat interitemSpacing;
   @property (nonatomic, assign) CGFloat fisheyeFactor;

   • All cells are laid out depending on the largest font, so large differnce between the sizes of font and highlightedFont is NOT recommended.
     
   • fisheyeFactor property affects perspective distortion. The range is 0.0 - 1.0; slight value such as 0.0001 is recommended.

5. After all settings, never forget to reload your picker.

   [self.pickerView reloadData];

6. Optional: You can use AKPickerViewDelegate method to observe selection changes:

   - (void)pickerView:(AKPickerView *)pickerView didSelectItem:(NSInteger)item;

   Additionally, you can use UIScrollViewDelegate method to observe scrolling.

For more detail, see the sample project.

Contact

@akkyie http://twitter.com/akkyie

License

MIT. See LICENSE.